John Clarke

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Biography

Dr. John Clarke recently joined the Gastroenterology & Hepatology Division at Stanford University as Director of the Esophageal Program. He previously spent 17 years in Baltimore, including 9 years on the faculty at Johns Hopkins University where he was an Associate Professor and at various times Director of Esophageal Motility, Director of Gastrointestinal Motility, Clinical Director of the Johns Hopkins Center for Neurogastroenterology, and Clinical Director of the Gastroenterology & Hepatology Division at Johns Hopkins Bayview Medical Center.

His career has combined research, education and clinical care. His clinical areas of expertise include achalasia, dysphagia, eosinophilic esophagitis, esophageal dysmotility, gastroesophageal reflux disease, gastroparesis, GI-manifestations of scleroderma and GI dysmotility. While at Johns Hopkins University, he was inducted into The Miller-Coulson Academy for Clinical Excellence, an institutional honor society for master clinicians at the time limited to 50 members across the entire university.

From an education standpoint, he has lectured in over a dozen countries, authored over 25 textbook chapters and serves on the educational affairs committee of the American College of Gastroenterology. He has also won several major teaching awards, including The Johns Hopkins University Alumni Association Award for Excellence in Teaching, given to one faculty member per year in the entire School of Medicine.

His research has focused on optimization and characterization of diagnostic studies to evaluate motility disorders, as well the relationship between therapeutic endoscopic techniques and treatment of motility disorders. He was an investigator on the NIH Gastroparesis Consortium and is also a former recipient of the AGA Don Castell Award.

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Professional Summary

Professional Education

Board Certification: American Board of Internal Medicine, Gastroenterology (2007)
Fellowship: Johns Hopkins University Dept of Gastroenterology (2007) MD
Board Certification: American Board of Internal Medicine, Internal Medicine (2002)

Residency: Johns Hopkins Hospital Internal Medicine Residency (2002) MD

Medical Education: Columbia University College of Physicians and Surgeons (1999) NY

Honors & Awards

Award for Excellence in Teaching, John Hopkins University Alumni Association (2015)

Administrative Appointments

Director, Esophageal Program, Stanford Medicine (2016 - Present)

Publications

Preliminary pneumoperitoneum facilitates transgastric access into the peritoneal cavity for natural orifice transluminal endoscopic surgery: A pilot study in a live porcine model
Ko, C.-W., Shin, E. J., Buscaglia, J. M., Clarke, J. O., Magno, P., Giday, S. A., … Kantsevoy, S. V. (2007). Preliminary pneumoperitoneum facilitates transgastric access into the peritoneal cavity for natural orifice transluminal endoscopic surgery: A pilot study in a live porcine model. ENDOSCOPY, 39(10), 849–53.
D-1- and D-2-like dopamine receptors are co-localized on the presynaptic varicosities of striatal and nucleus accumbens neurons in vitro
Wong, A. C., Shetreat, M. E., Clarke, J. O., & Rayport, S. (1999). D-1- and D-2-like dopamine receptors are co-localized on the presynaptic varicosities of striatal and nucleus accumbens neurons in vitro. NEUROSCIENCE, 89(1), 221–233.
Is blood the ideal submucosal cushioning agent? A comparative study in a porcine model
Giday, S. A., Magno, P., Buscaglia, J. M., Canto, M. I., Ko, C.-W., Shin, E. J., … Kantsevoy, S. V. (2006). Is blood the ideal submucosal cushioning agent? A comparative study in a porcine model. ENDOSCOPY, 38(12), 1230–1234.

Nausea and vomiting in gastroparesis: similarities and differences in idiopathic and diabetic gastroparesis.
Parkman, H. P., Hallinan, E. K., Hasler, W. L., Farrugia, G., Koch, K. L., Calles, J., … HAMILTON, F. (2016). Nausea and vomiting in gastroparesis: similarities and differences in idiopathic and diabetic gastroparesis. Neurogastroenterology and Motility .

Clinical and pH study characteristics in reflux patients with and without ineffective oesophageal motility (IEM).
Triadafilopoulos, G., Tandon, A., Shetler, K. P., & Clarke, J. (2016). Clinical and pH study characteristics in reflux patients with and without ineffective oesophageal motility (IEM). BMJ Open Gastroenterology, 3(1).

Pyloric Therapies for Gastroparesis.
Ahuja, N. K., & Clarke, J. O. (2017). Pyloric Therapies for Gastroparesis. Current Treatment Options in Gastroenterology.

The Role of Impedance Planimetry in the Evaluation of Esophageal Disorders.
Ahuja, N. K., & Clarke, J. O. (2017). The Role of Impedance Planimetry in the Evaluation of Esophageal Disorders. Current Gastroenterology Reports, 19(2), 7-?

Three-Dimensional Anorectal Manometry Enhances Diagnostic Gain by Detecting Sphincter Defects and Puborectalis Pressure.
Raja, S., Okeke, F. C., Stein, E. M., Dhalla, S., Nandwani, M., Lynch, K. L., … Clarke, J. O. (2017). Three-Dimensional Anorectal Manometry Enhances Diagnostic Gain by Detecting Sphincter Defects and Puborectalis Pressure. Digestive Diseases and Sciences.

What is the clinical significance of esophagogastric junction outflow obstruction? evaluation of 60 patients at a tertiary referral center.
Okeke, F. C., Raja, S., Lynch, K. L., Dhalla, S., Nandwani, M., Stein, E. M., … Clarke, J. O. (2017). What is the clinical significance of esophagogastric junction outflow obstruction? evaluation of 60 patients at a tertiary referral center. Neurogastroenterology and Motility , 29(6).

Esophageal distensibility measurement: impact on clinical management and procedure length.
Ahuja, N. K., Agnihotri, A., Lynch, K. L., Hoo-Fatt, D., Onyimba, F., McKnight, M., … Clarke, J. O. (2017). Esophageal distensibility measurement: impact on clinical management and procedure length. Diseases of the Esophagus , 30(8), 1–8.

The Changing Impact of Gastroesophageal Reflux Disease in Clinical Practice: An Updated Study
Akst, L. M., Haque, O. J., Clarke, J. O., Hillel, A. T., Best, S. R. A., & Altman, K. W. (2017). The Changing Impact of Gastroesophageal Reflux Disease in Clinical Practice: An Updated Study. ANNALS OF OTOLOGY RHINOLOGY AND LARYNGOLOGY, 126(3), 229–35.

Early satiety and postprandial fullness in gastroparesis correlate with gastroparesis severity, gastric emptying, and water load testing
Parkman, H. P., Hallinan, E. K., Hasler, W. L., Farrugia, G., Koch, K. L., Nguyen, L., … HAMILTON, F. (2017). Early satiety and postprandial fullness in gastroparesis correlate with gastroparesis severity, gastric emptying, and water load testing. NEUROGASTROENTEROLOGY AND MOTILITY, 29(4).

Learning Curve for PerOral Endoscopic Myotomy Deciphered: a Comprehensive Analysis Using Two Different Methodologies
El Zein, M. H., Kumbhari, V., Saxena, P., Kamal, A., Ngamruengphong, S., Besharati, S., … Khashab, M. (2015). Learning Curve for PerOral Endoscopic Myotomy Deciphered: a Comprehensive Analysis Using Two Different Methodologies. GASTROINTESTINAL ENDOSCOPY, 81(5), AB167–AB167.

Intraoperative measurement of esophagogastric junction cross-sectional area by impedance planimetry correlates with clinical outcomes of peroral endoscopic myotomy for achalasia: a multicenter study
Ngamruengphong, S., von Rahden, B. H. A., Filser, J., Tyberg, A., Desai, A., Sharaiha, R. Z., … Khashab, M. A. (2016). Intraoperative measurement of esophagogastric junction cross-sectional area by impedance planimetry correlates with clinical outcomes of peroral endoscopic myotomy for achalasia: a multicenter study. SURGICAL ENDOSCOPY AND OTHER INTERVENTIONAL TECHNIQUES, 30(7), 2886–94.

Comprehensive analysis of efficacy and safety of peroral endoscopic myotomy performed by a gastroenterologist in the endoscopy unit: a single-center experience
Khashab, M. A., El Zein, M., Kumbhari, V., Besharati, S., Ngamruengphong, S., Messallam, A., … Clarke, J. O. (2016). Comprehensive analysis of efficacy and safety of peroral endoscopic myotomy performed by a gastroenterologist in the endoscopy unit: a single-center experience. GASTROINTESTINAL ENDOSCOPY, 83(1), 117–25.

Gender is a determinative factor in the initial clinical presentation of eosinophilic esophagitis
Lynch, K. L., Dhalla, S., Chedid, V., Ravich, W. J., Stein, E. M., Montgomery, E. A., … Clarke, J. O. (2016). Gender is a determinative factor in the initial clinical presentation of eosinophilic esophagitis. DISEASES OF THE ESOPHAGUS, 29(2), 174–78.

Outcomes and Factors Associated With Reduced Symptoms in Patients With Gastroparesis
Pasricha, P. J., Yates, K. P., Nguyen, L., Clarke, J., Abell, T. L., Farrugia, G., … Parkman, H. P. (2015). Outcomes and Factors Associated With Reduced Symptoms in Patients With Gastroparesis. GASTROENTEROLOGY, 149(7), 1762-?

Refractory gastroparesis can be successfully managed with endoscopic transpyloric stent placement and fixation (with video)
Khashab, M. A., Besharati, S., Ngamruengphong, S., Kumbhari, V., El Zein, M., Stein, E. M., … Clarke, J. O. (2015). Refractory gastroparesis can be successfully managed with endoscopic transpyloric stent placement and fixation (with video). GASTROINTESTINAL ENDOSCOPY, 82(6), 1106–9.

Comprehensive Radionuclide Esophagogastrointestinal Transit Study: Methodology, Reference Values, and Initial Clinical Experience
Antoniou, A. J., Raja, S., El-Khouli, R., Mena, E., Lodge, M. A., Wahl, R. L., … Ziessman, H. A. (2015). Comprehensive Radionuclide Esophagogastrointestinal Transit Study: Methodology, Reference Values, and Initial Clinical Experience. JOURNAL OF NUCLEAR MEDICINE, 56(5), 721–27.

Small Intestinal Transit Time Is Delayed in Small Intestinal Bacterial Overgrowth
Roland, B. C., Ciarleglio, M. M., Clarke, J. O., Semler, J. R., Tomakin, E., Mullin, G. E., & Pasricha, P. J. (2015). Small Intestinal Transit Time Is Delayed in Small Intestinal Bacterial Overgrowth. JOURNAL OF CLINICAL GASTROENTEROLOGY, 49(7), 571–76.

High-resolution anorectal manometry and dynamic pelvic magnetic resonance imaging are complementary technologies
Jodorkovsky, D., Macura, K. J., Gearhart, S. L., Dunbar, K. B., Stein, E. M., & Clarke, J. O. (2015). High-resolution anorectal manometry and dynamic pelvic magnetic resonance imaging are complementary technologies. JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, 30(1), 71–74.

Upper Esophageal Sphincter Abnormalities Frequent Finding on High-resolution Esophageal Manometry and Associated With Poorer Treatment Response in Achalasia
Chavez, Y. H., Ciarleglio, M. M., Clarke, J. O., Nandwani, M., Stein, E., & Roland, B. C. (2015). Upper Esophageal Sphincter Abnormalities Frequent Finding on High-resolution Esophageal Manometry and Associated With Poorer Treatment Response in Achalasia. JOURNAL OF CLINICAL GASTROENTEROLOGY, 49(1), 17–23.

Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth.
Chedid, V., Dhalla, S., Clarke, J. O., Roland, B. C., Dunbar, K. B., Koh, J., … Mullin, G. E. (2014). Herbal therapy is equivalent to rifaximin for the treatment of small intestinal bacterial overgrowth. Global Advances in Health and Medicine, 3(3), 16–24.

Low Ileocecal Valve Pressure Is Significantly Associated with Small Intestinal Bacterial Overgrowth (SIBO)
Roland, B. C., Ciarleglio, M. M., Clarke, J. O., Semler, J. R., Tomakin, E., Mullin, G. E., & Pasricha, P. J. (2014). Low Ileocecal Valve Pressure Is Significantly Associated with Small Intestinal Bacterial Overgrowth (SIBO). DIGESTIVE DISEASES AND SCIENCES, 59(6), 1269–77.

Domperidone for delayed gastric emptying in lung transplant recipients with and without gastroesophageal reflux
Lidor, A. O., Ensor, C. R., Sheer, A. J., Orens, J. B., Clarke, J. O., & McDyer, J. F. (2014). Domperidone for delayed gastric emptying in lung transplant recipients with and without gastroesophageal reflux. PROGRESS IN TRANSPLANTATION, 24(1), 27–32.

Multichannel Intraluminal Impedance-pH Testing Is Clinically Useful in the Management of Patients with Gastroesophageal Reflux Symptoms
Jodorkovsky, D., Price, J. C., Kim, B., Dhalla, S., Stein, E. M., & Clarke, J. O. (2014). Multichannel Intraluminal Impedance-pH Testing Is Clinically Useful in the Management of Patients with Gastroesophageal Reflux Symptoms. DIGESTIVE DISEASES AND SCIENCES, 59(8), 1817–22.

Peroral endoscopic myotomy as a platform for the treatment of spastic esophageal disorders refractory to medical therapy (with video)
Khashab, M. A., Saxena, P., Kumbhari, V., Nandwani, M., Roland, B. C., Stein, E., … Pasricha, P. J. (2014). Peroral endoscopic myotomy as a platform for the treatment of spastic esophageal disorders refractory to medical therapy (with video). GASTROINTESTINAL ENDOSCOPY, 79(1), 136–39.

Jet injection of dyed saline facilitates efficient peroral endoscopic myotomy
Khashab, M. A., Messallam, A. A., Saxena, P., Kumbhari, V., Ricourt, E., Aguila, G., … Clarke, J. O. (2014). Jet injection of dyed saline facilitates efficient peroral endoscopic myotomy. ENDOSCOPY, 46(4), 298–301.

Through-the-scope transpyloric stent placement improves symptoms and gastric emptying in patients with gastroparesis
Clarke, J. O., Sharaiha, R. Z., Valeshabad, A. K., Lee, L. A., Kalloo, A. N., & Khashab, M. A. (2013). Through-the-scope transpyloric stent placement improves symptoms and gastric emptying in patients with gastroparesis. ENDOSCOPY, 45, E189–E190.

Biofeedback Therapy for Defecatory Dysfunction "Real Life" Experience
Jodorkovsky, D., Dunbar, K. B., Gearhart, S. L., Stein, E. M., & Clarke, J. O. (2013). Biofeedback Therapy for Defecatory Dysfunction "Real Life" Experience. JOURNAL OF CLINICAL GASTROENTEROLOGY, 47(3), 252–55.

The Relationship Between Depressive Symptoms and Voice Handicap Index Scores in Laryngopharyngeal Reflux
Elam, J. C., Ishman, S. L., Dunbar, K. B., Clarke, J. O., & Gourin, C. G. (2010). The Relationship Between Depressive Symptoms and Voice Handicap Index Scores in Laryngopharyngeal Reflux. LARYNGOSCOPE, 120(9), 1900–1903.

Enhanced diagnostic yield with prolonged small bowel transit time during capsule endoscopy.
Buscaglia, J. M., Kapoor, S., Clarke, J. O., Bucobo, J. C., Giday, S. A., Magno, P., … Mullin, G. E. (2008). Enhanced diagnostic yield with prolonged small bowel transit time during capsule endoscopy. International Journal of Medical Sciences, 5(6), 303–8.

Multi-Organ RNA-Sequencing of Patients with Systemic Sclerosis (SSc) Finds That Intrinsic Subsets Are Conserved across Organ Systems
Mehta, B. K., Franks, J., Cai, G., Toledo, D., Wood, T. A., Archambault, K. A., … Whitfield, M. L. (2017). Multi-Organ RNA-Sequencing of Patients with Systemic Sclerosis (SSc) Finds That Intrinsic Subsets Are Conserved across Organ Systems. ARTHRITIS & RHEUMATOLOGY. WILEY.

Aprepitant for Symptoms of Gastroparesis and Related Disorders: The APRON Randomized Clinical Trial
Pasricha, P. J., Yates, K., Sarosiek, I., McCallum, R., Clarke, J., Nguyen, L., … Parkman, H. (2016). Aprepitant for Symptoms of Gastroparesis and Related Disorders: The APRON Randomized Clinical Trial. AMERICAN JOURNAL OF GASTROENTEROLOGY. NATURE PUBLISHING GROUP.

Aprepitant Has Mixed Effects on Nausea and Reduces Other Symptoms in Patients With Gastroparesis and Related Disorders
Pasricha, P. J., Yates, K. P., Sarosiek, I., McCallum, R. W., Abell, T. L., Koch, K. L., … Parkman, H. P. (2018). Aprepitant Has Mixed Effects on Nausea and Reduces Other Symptoms in Patients With Gastroparesis and Related Disorders. GASTROENTEROLOGY, 154(1), 65-+.

Baclofen and gastroesophageal reflux disease: seeing the forest through the trees.
Clarke, J. O., Fernandez-Becker, N. Q., Regalia, K. A., & Triadafilopoulos, G. (2018). Baclofen and gastroesophageal reflux disease: seeing the forest through the trees. Clinical and Translational Gastroenterology, 9(3), 137.

Advances in the diagnosis and classification of gastric and intestinal motility disorders
Keller, J., Bassotti, G., Clarke, J., Dinning, P., Fox, M., Grover, M., … Camilleri, M. (2018). Advances in the diagnosis and classification of gastric and intestinal motility disorders. NATURE REVIEWS GASTROENTEROLOGY & HEPATOLOGY, 15(5), 291–308.

The Effect of Race in Patients with Achalasia Diagnosed With High-Resolution Esophageal Manometry
Chedid, V., Rosenblatt, E., Gandhi, K. (K., Dhalla, S., Nandwani, M. C., Stein, E. M., & Clarke, J. O. (2018). The Effect of Race in Patients with Achalasia Diagnosed With High-Resolution Esophageal Manometry. AMERICAN JOURNAL OF THE MEDICAL SCIENCES, 355(2), 126–31.

A Positive Correlation Between Gastric and Esophageal Dysmotility Suggests Common Causality.
Zikos, T. A., Clarke, J. O., Triadafilopoulos, G., Regalia, K. A., Sonu, I. S., Fernandez-Becker, N. Q., … Nguyen, L. A. (2018). A Positive Correlation Between Gastric and Esophageal Dysmotility Suggests Common Causality. Digestive Diseases and Sciences.

REFRACTORY GASTROPARESIS: GASTRIC PERORAL ENDOSCOPIC MYOTOMY (G-POEM) VS. INTRAPYLORIC BOTULINUM TOXIN INJECTION
Parsa, N., Yang, J., Gutierrez, O. I. B., Moran, R., Sanaei, O., Fayad, L., … Khashab, M. A. (2018). REFRACTORY GASTROPARESIS: GASTRIC PERORAL ENDOSCOPIC MYOTOMY (G-POEM) VS. INTRAPYLORIC BOTULINUM TOXIN INJECTION. GASTROINTESTINAL ENDOSCOPY, 87(6), AB241–AB242.

Use of Esophageal pH Monitoring to Minimize Proton-Pump Inhibitor Utilization in Patients with Gastroesophageal Reflux Symptoms.
Triadafilopoulos, G., Zikos, T., Regalia, K., Sonu, I., Fernandez-Becker, N. Q., Nguyen, L., … Clarke, J. O. (2018). Use of Esophageal pH Monitoring to Minimize Proton-Pump Inhibitor Utilization in Patients with Gastroesophageal Reflux Symptoms. Digestive Diseases and Sciences.

Nonerosive reflux disease: clinical concepts.
Gyawali, C. P., Azagury, D. E., Chan, W. W., Chandramohan, S. M., Clarke, J. O., de Bortoli, N., … Wu, J. (2018). Nonerosive reflux disease: clinical concepts. Annals of the New York Academy of Sciences.

Indications and interpretation of esophageal function testing.
Gyawali, C. P., de Bortoli, N., Clarke, J., Marinelli, C., Tolone, S., Roman, S., & Savarino, E. (2018). Indications and interpretation of esophageal function testing. Annals of the New York Academy of Sciences.

Pyridostigmine for the treatment of gastrointestinal symptoms in systemic sclerosis.
Ahuja, N. K., Mische, L., Clarke, J. O., Wigley, F. M., & McMahan, Z. H. (2018). Pyridostigmine for the treatment of gastrointestinal symptoms in systemic sclerosis. Seminars in Arthritis and Rheumatism.

Patients with symptoms of delayed gastric emptying have a high prevalence of oesophageal dysmotility, irrespective of scintigraphic evidence of gastroparesis.
Triadafilopoulos, G., Nguyen, L., & Clarke, J. O. (2017). Patients with symptoms of delayed gastric emptying have a high prevalence of oesophageal dysmotility, irrespective of scintigraphic evidence of gastroparesis. BMJ Open Gastroenterology, 4(1), e000169.

Relating gastric scintigraphy and symptoms to motility capsule transit and pressure findings in suspected gastroparesis.
Hasler, W. L., May, K. P., Wilson, L. A., Van Natta, M., Parkman, H. P., Pasricha, P. J., … Hamilton, F. A. (2018). Relating gastric scintigraphy and symptoms to motility capsule transit and pressure findings in suspected gastroparesis. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, 30(2).

Learning curve for peroral endoscopic myotomy
El Zein, M., Kumbhari, V., Ngamruengphong, S., Carson, K. A., Stein, E., Tieu, A., … Khashab, M. A. (2016). Learning curve for peroral endoscopic myotomy. ENDOSCOPY INTERNATIONAL OPEN, 4(5), E577–E582.

Upper Esophageal Sphincter Abnormalities Are Strongly Predictive of Treatment Response in Patients with Achalasia
Mathews, S., Chavez, Y., Ciarleglio, M., Clarke, J., Stein, E., & Roland, B. C. (2013). Upper Esophageal Sphincter Abnormalities Are Strongly Predictive of Treatment Response in Patients with Achalasia. AMERICAN JOURNAL OF GASTROENTEROLOGY, 108, S1–S2.

The Added Diagnostic Value of Liquid Gastric Emptying Compared with Solid Emptying Alone
Ziessman, H. A., Chander, A., Clarke, J. O., Ramos, A., & Wahl, R. L. (2009). The Added Diagnostic Value of Liquid Gastric Emptying Compared with Solid Emptying Alone. JOURNAL OF NUCLEAR MEDICINE, 50(5), 726–31.

Endoscopic retrograde cholangiopancreatography, but not esophagogastroduodenoscopy or colonoscopy, significantly increases portal venous pressure: direct portal pressure measurements through endoscopic ultrasound-guided cannulation
Buscaglia, J. M., Shin, E. J., Clarke, J. O., Giday, S. A., Ko, C. W., Thuluvath, P. J., … Kantsevoy, S. V. (2008). Endoscopic retrograde cholangiopancreatography, but not esophagogastroduodenoscopy or colonoscopy, significantly increases portal venous pressure: direct portal pressure measurements through endoscopic ultrasound-guided cannulation. ENDOSCOPY, 40(8), 670–74.

EUS-guided submucosal implantation of a radiopaque marker: a simple and effective procedure to facilitate subsequent surgical and radiation therapy
Magno, P., Giday, S. A., Gabrielson, K. L., Shin, E. J., Clarke, J. O., Ko, C.-W., … Kantsevoy, S. V. (2008). EUS-guided submucosal implantation of a radiopaque marker: a simple and effective procedure to facilitate subsequent surgical and radiation therapy. GASTROINTESTINAL ENDOSCOPY, 67(7), 1147–52.

Severity of post-ERCP pancreatitis directly proportional to the invasiveness of endoscopic intervention: a pilot study in a canine model
Buscaglia, J. M., Simons, B. W., Prosser, B. J., Ruben, D. S., Giday, S. A., Magno, P., … Jagannath, S. B. (2008). Severity of post-ERCP pancreatitis directly proportional to the invasiveness of endoscopic intervention: a pilot study in a canine model. ENDOSCOPY, 40(6), 506–12.

How good is capsule endoscopy for detection of periampullary lesions? Results of a tertiary-referral center
Clarke, J. O., Giday, S. A., Magno, P., Shin, E. J., Buscaglia, J. M., Jagannath, S. B., & Mullin, G. E. (2008). How good is capsule endoscopy for detection of periampullary lesions? Results of a tertiary-referral center. GASTROINTESTINAL ENDOSCOPY, 68(2), 267–72.

Performance characteristics of the suspected blood indicator feature in capsule endoscopy according to indication for study
Buscaglia, J. M., Giday, S. A., Kantsevoy, S. V., Clarke, J. O., Magno, P., Yong, E., & Mullin, G. E. (2008). Performance characteristics of the suspected blood indicator feature in capsule endoscopy according to indication for study. CLINICAL GASTROENTEROLOGY AND HEPATOLOGY, 6(3), 298–301.

EUS-guided portal vein catheterization: a promising novel approach for portal angiography and portal vein pressure measurements
Giday, S. A., Clarke, J. O., Buscaglia, J. M., Shin, E. J., Ko, C.-W., Magno, P., & Kantsevoy, S. V. (2008). EUS-guided portal vein catheterization: a promising novel approach for portal angiography and portal vein pressure measurements. GASTROINTESTINAL ENDOSCOPY, 67(2), 338–42.

Classifying esophageal motility by pressure topography characteristics: A study of 400 patients and 75 controls
Pandolfino, J. E., Ghosh, S. K., Rice, J., Clarke, J. O., Kwiatek, M. A., & Kahrilas, P. J. (2008). Classifying esophageal motility by pressure topography characteristics: A study of 400 patients and 75 controls. AMERICAN JOURNAL OF GASTROENTEROLOGY, 103(1), 27–37.

EUS-guided portal vein carbon dioxide angiography: a pilot study in a porcine model
Giday, S. A., Ko, C.-W., Clarke, J. O., Shin, E. J., Magno, P., Jagannath, S. B., … Kantsevoy, S. V. (2007). EUS-guided portal vein carbon dioxide angiography: a pilot study in a porcine model. GASTROINTESTINAL ENDOSCOPY, 66(4), 814–19.

Comparative study of endoscopic clips: duration of attachment at the site of clip application
Shin, E. J., Ko, C.-W., Magno, P., Giday, S. A., Clarke, J. O., Buscaglia, J. M., … Kantsevoy, S. V. (2007). Comparative study of endoscopic clips: duration of attachment at the site of clip application. GASTROINTESTINAL ENDOSCOPY, 66(4), 757–61.

EUS-guided angiography: a novel approach to diagnostic and therapeutic interventions in the vascular system
Magno, P., Ko, C.-W., Buscaglia, J. M., Giday, S. A., Jagannath, S. B., Clarke, J. O., … Kantsevoy, S. V. (2007). EUS-guided angiography: a novel approach to diagnostic and therapeutic interventions in the vascular system. GASTROINTESTINAL ENDOSCOPY, 66(3), 587–91.

Impaired deglutitive EGJ relaxation in clinical esophageal manometry: a quantitative analysis of 400 patients and 75 controls
Ghosh, S. K., Pandolfino, J. E., Rice, J., Clarke, J. O., Kwiatek, M., & Kahrilas, P. J. (2007). Impaired deglutitive EGJ relaxation in clinical esophageal manometry: a quantitative analysis of 400 patients and 75 controls. AMERICAN JOURNAL OF PHYSIOLOGY-GASTROINTESTINAL AND LIVER PHYSIOLOGY, 293(4), G878–G885.

EUS-guided implantation of radiopaque marker into mediastinal and celiac lymph nodes is safe and effective
Magno, P., Giday, S. A., Gabrielson, K. L., Shin, E. J., Buscaglia, J. M., Clarke, J. O., … Kantsevoy, S. V. (2007). EUS-guided implantation of radiopaque marker into mediastinal and celiac lymph nodes is safe and effective. GASTROINTESTINAL ENDOSCOPY, 66(2), 387–92.

The utility of contrast-enhanced endoscopic ultrasound in monitoring ethanol-induced pancreatic tissue ablation: a pilot study in a porcine model
Giday, S. A., Magno, P., Gabrielson, K. L., Buscaglia, J. M., Canto, M. I., Ko, C. W., … Kantsevoy, S. V. (2007). The utility of contrast-enhanced endoscopic ultrasound in monitoring ethanol-induced pancreatic tissue ablation: a pilot study in a porcine model. ENDOSCOPY, 39(6), 525–29.

High-resolution manometry of the EGJ: An analysis of crural diaphragm function in GERD
Pandolfino, J. E., Kim, H., Ghosh, S. K., Clarke, J. O., Zhang, Q., & Kahrilas, P. J. (2007). High-resolution manometry of the EGJ: An analysis of crural diaphragm function in GERD. AMERICAN JOURNAL OF GASTROENTEROLOGY, 102(5), 1056–63.

An endoscopically implantable device stimulates the lower esophageal sphincter on demand by remote control: a study using a canine model
Clarke, J. O., Jagannath, S. B., Kalloo, A. N., Long, V. R., Beitler, D. M., & Kantsevoy, S. V. (2007). An endoscopically implantable device stimulates the lower esophageal sphincter on demand by remote control: a study using a canine model. ENDOSCOPY, 39(1), 72–76.

Clinical and manometric characteristics of patients with oesophagogastric outflow obstruction: towards a new classification.
Triadafilopoulos, G., & Clarke, J. O. (2018). Clinical and manometric characteristics of patients with oesophagogastric outflow obstruction: towards a new classification. BMJ Open Gastroenterology, 5(1), e000210.

Clinical and pH study characteristics in reflux patients with and without ineffective oesophageal motility (IEM)
Triadafilopoulos, G., Tandon, A., Shetler, K. P., & Clarke, J. (2016). Clinical and pH study characteristics in reflux patients with and without ineffective oesophageal motility (IEM). BMJ OPEN GASTROENTEROLOGY, 3(1).

Incorporating Advanced Practice Providers into Gastroenterology Practice.
Nandwani, M. C., & Clarke, J. O. (2018). Incorporating Advanced Practice Providers into Gastroenterology Practice. Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association.

Gastrointestinal Involvement in Systemic Sclerosis An Update
Miller, J. B., Gandhi, N., Clarke, J., & McMahan, Z. (2018). Gastrointestinal Involvement in Systemic Sclerosis An Update. JCR-JOURNAL OF CLINICAL RHEUMATOLOGY, 24(6), 328–37.

Multi-Organ RNA-Sequencing of Patients with Systemic Sclerosis (SSc) Finds That Intrinsic Subsets Are Conserved across Organ Systems
Mehta, B. K., Franks, J., Wang, Y., Cai, G., Toledo, D. M., Wood, T. A., … Whitfield, M. L. (2018). Multi-Organ RNA-Sequencing of Patients with Systemic Sclerosis (SSc) Finds That Intrinsic Subsets Are Conserved across Organ Systems. ARTHRITIS & RHEUMATOLOGY. WILEY.

Identification of Risk Factors for Gastric Antral Vascular Ectasia (GAVE) Among Systemic Sclerosis Patients
Serling-Boyd, N., Li, S., Fiorentino, D., Becker, L., Fernandez-Becker, N., Clarke, J., & Chung, L. (2018). Identification of Risk Factors for Gastric Antral Vascular Ectasia (GAVE) Among Systemic Sclerosis Patients. ARTHRITIS & RHEUMATOLOGY, 70.

Helping Patients with Gastroparesis.
Onyimba, F. U., & Clarke, J. O. (2019). Helping Patients with Gastroparesis. The Medical Clinics of North America, 103(1), 71–87.

Abdominal Pain in Patients with Gastroparesis: Associations with Gastroparesis Symptoms, Etiology of Gastroparesis, Gastric Emptying, Somatization, and Quality of Life.
Parkman, H. P., Wilson, L. A., Hasler, W. L., McCallum, R. W., Sarosiek, I., Koch, K. L., … Pasricha, P. J. (2019). Abdominal Pain in Patients with Gastroparesis: Associations with Gastroparesis Symptoms, Etiology of Gastroparesis, Gastric Emptying, Somatization, and Quality of Life. Digestive Diseases and Sciences.

High Prevalence of Slow Transit Constipation in Patients With Gastroparesis.
Zikos, T. A., Kamal, A. N., Neshatian, L., Triadafilopoulos, G., Clarke, J. O., Nandwani, M., & Nguyen, L. A. (2019). High Prevalence of Slow Transit Constipation in Patients With Gastroparesis. Journal of Neurogastroenterology and Motility.

Under Pressure: Do Volume-Based Measurements Define Rectal Hyposensitivity in Clinical Practice?
Kamal, A. N., Garcia, P., & Clarke, J. O. (2019). Under Pressure: Do Volume-Based Measurements Define Rectal Hyposensitivity in Clinical Practice? Digestive Diseases and Sciences.

Ineffective esophageal motility: Concepts, future directions, and conclusions from the Stanford 2018 symposium.
Gyawali, C. P., Sifrim, D., Carlson, D. A., Hawn, M., Katzka, D. A., Pandolfino, J. E., … Triadafilopoulos, G. (2019). Ineffective esophageal motility: Concepts, future directions, and conclusions from the Stanford 2018 symposium. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e13584.

Murky Waters for Diagnosis of Gastroparesis.
Kunkel, D. C., & Clarke, J. O. (2019). Murky Waters for Diagnosis of Gastroparesis. Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association.

Esophagogastroduodenoscopy and Esophageal Involvement in Patients With Pemphigus Vulgaris
Ozeki, K., Zikos, T. A., Clarke, J., & Sonu, I. (2018). Esophagogastroduodenoscopy and Esophageal Involvement in Patients With Pemphigus Vulgaris. AMERICAN JOURNAL OF GASTROENTEROLOGY, 113, S177.

High Prevalence of Slow Transit Constipation in Patients With Gastroparesis
Zikos, T. A., Kamal, A. N., Neshatian, L., Triadafilopoulos, G., Clarke, J. O., Nandwani, M., & Nguyen, L. A. (2019). High Prevalence of Slow Transit Constipation in Patients With Gastroparesis. JOURNAL OF NEUROGASTROENTEROLOGY AND MOTILITY, 25(2), 267–75.

Use of Esophageal pH Monitoring to Minimize Proton-Pump Inhibitor Utilization in Patients with Gastroesophageal Reflux Symptoms
Triadafilopoulos, G., Zikos, T., Regalia, K., Sonu, I., Fernandez-Becker, N. Q., Nguyen, L., … Clarke, J. O. (2018). Use of Esophageal pH Monitoring to Minimize Proton-Pump Inhibitor Utilization in Patients with Gastroesophageal Reflux Symptoms. DIGESTIVE DISEASES AND SCIENCES, 63(10), 2673–80.

A Positive Correlation Between Gastric and Esophageal Dysmotility Suggests Common Causality
Zikos, T. A., Clarke, J. O., Triadafilopoulos, G., Regalia, K. A., Sonu, I. S., Fernandez-Becker, N. Q., … Nguyen, L. A. (2018). A Positive Correlation Between Gastric and Esophageal Dysmotility Suggests Common Causality. DIGESTIVE DISEASES AND SCIENCES, 63(12), 3417–24.

Opioid Use and Potency Are Associated With Clinical Features, Quality of Life, and Use of Resources in Patients With Gastroparesis
Hasler, W. L., Wilson, L. A., Nguyen, L. A., Snape, W. J., Abell, T. L., Koch, K. L., … Yates, K. (2019). Opioid Use and Potency Are Associated With Clinical Features, Quality of Life, and Use of Resources in Patients With Gastroparesis. CLINICAL GASTROENTEROLOGY AND HEPATOLOGY, 17(7), 1285-+.

Gastric per-oral endoscopic myotomy: Current status and future directions
Podboy, A., Hwang, J. H., Nguyen, L. A., Garcia, P., Zikos, T. A., Kamal, A., … Clarke, J. O. (2019). Gastric per-oral endoscopic myotomy: Current status and future directions. WORLD JOURNAL OF GASTROENTEROLOGY, 25(21), 2581–90.

Gastric per-oral endoscopic myotomy: Current status and future directions.
Podboy, A., Hwang, J. H., Nguyen, L. A., Garcia, P., Zikos, T. A., Kamal, A., … Clarke, J. O. (2019). Gastric per-oral endoscopic myotomy: Current status and future directions. World Journal of Gastroenterology, 25(21), 2581–2590.

PER-ORAL ENDOSCOPIC MYOTOMY HAS SIMILAR EFFICACY COMPARED TO LAPAROSCOPIC HELLER MYOTOMY AFTER 4 YEARS: A SINGLE CENTER EXPERIENCE
Podboy, A. J., Hwang, J. H., Rivas, H., Azagury, D., Hawn, M. T., Kamal, A., … Clarke, J. O. (2019). PER-ORAL ENDOSCOPIC MYOTOMY HAS SIMILAR EFFICACY COMPARED TO LAPAROSCOPIC HELLER MYOTOMY AFTER 4 YEARS: A SINGLE CENTER EXPERIENCE. GASTROINTESTINAL ENDOSCOPY, 89(6), AB201–AB202.

Baclofen and gastroesophageal reflux disease: seeing the forest through the trees
Clarke, J. O., Fernandez-Becker, N. Q., Regalia, K. A., & Triadafilopoulos, G. (2018). Baclofen and gastroesophageal reflux disease: seeing the forest through the trees. CLINICAL AND TRANSLATIONAL GASTROENTEROLOGY, 9.

Abdominal Pain in Patients with Gastroparesis: Associations with Gastroparesis Symptoms, Etiology of Gastroparesis, Gastric Emptying, Somatization, and Quality of Life
Parkman, H. P., Wilson, L. A., Hasler, W. L., McCallum, R. W., Sarosiek, I., Koch, K. L., … Pasricha, P. J. (2019). Abdominal Pain in Patients with Gastroparesis: Associations with Gastroparesis Symptoms, Etiology of Gastroparesis, Gastric Emptying, Somatization, and Quality of Life. DIGESTIVE DISEASES AND SCIENCES, 64(8), 2242–55.

Murky Waters for Diagnosis of Gastroparesis
Kunkel, D. C., & Clarke, J. O. (2019). Murky Waters for Diagnosis of Gastroparesis. CLINICAL GASTROENTEROLOGY AND HEPATOLOGY, 17(9), 1724–25.

Ineffective esophageal motility: Concepts, future directions, and conclusions from the Stanford 2018 symposium
Gyawali, C. P., Sifrim, D., Carlson, D. A., Hawn, M., Katzka, D. A., Pandolfino, J. E., … Triadafilopoulos, G. (2019). Ineffective esophageal motility: Concepts, future directions, and conclusions from the Stanford 2018 symposium. NEUROGASTROENTEROLOGY AND MOTILITY, 31(9).

Esophagogastroduodenoscopy and Esophageal Involvement in Patients with Pemphigus Vulgaris.
Ozeki, K. A., Zikos, T. A., Clarke, J. O., & Sonu, I. (2019). Esophagogastroduodenoscopy and Esophageal Involvement in Patients with Pemphigus Vulgaris. Dysphagia.

Impact of nurse practitioner navigation on access to care for patients with refractory gastroesophageal reflux disease.
Nandwani, M., Clarke, J. O., Kuriakose, C., & Stevenson, E. (2019). Impact of nurse practitioner navigation on access to care for patients with refractory gastroesophageal reflux disease. Journal of the American Association of Nurse Practitioners.

Reduction in Hospitalizations for Esophageal Reflux in a Decade with Minimal Increases in Other Functional and Motor Disorders.
Zikos, T. A., Hendler, S., Clarke, J. O., Triadafilopoulos, G., Nguyen, L., & Limketkai, B. N. (2019). Reduction in Hospitalizations for Esophageal Reflux in a Decade with Minimal Increases in Other Functional and Motor Disorders. Digestive Diseases and Sciences.

Delayed Gastric Emptying Associates With Diabetic Complications in Diabetic Patients With Symptoms of Gastroparesis.
Parkman, H. P., Wilson, L. A., Farrugia, G., Koch, K. L., Hasler, W. L., Nguyen, L. A., … Pasricha, P. J. (2019). Delayed Gastric Emptying Associates With Diabetic Complications in Diabetic Patients With Symptoms of Gastroparesis. The American Journal of Gastroenterology.

Ninety-Six Hour Wireless Esophageal pH Study in Patients with GERD Shows that Restrictive Diet Reduces Esophageal Acid Exposure.
Triadafilopoulos, G., Korzilius, J. W., Zikos, T., Sonu, I., Fernandez-Becker, N. Q., Nguyen, L., & Clarke, J. O. (2019). Ninety-Six Hour Wireless Esophageal pH Study in Patients with GERD Shows that Restrictive Diet Reduces Esophageal Acid Exposure. Digestive Diseases and Sciences.

Incorporating Advanced Practice Providers Into Gastroenterology Practice
Nandwani, M. C. R., & Clarke, J. O. (2019). Incorporating Advanced Practice Providers Into Gastroenterology Practice. CLINICAL GASTROENTEROLOGY AND HEPATOLOGY, 17(3), 365–69.

Open-label pilot study: Non-invasive vagal nerve stimulation improves symptoms and gastric emptying in patients with idiopathic gastroparesis.
Gottfried-Blackmore, A., Adler, E. P., Fernandez-Becker, N., Clarke, J., Habtezion, A., & Nguyen, L. (2019). Open-label pilot study: Non-invasive vagal nerve stimulation improves symptoms and gastric emptying in patients with idiopathic gastroparesis. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e13769.

Changes in high-resolution manometric diagnosis over time: implications for clinical decision-making.
Triadafilopoulos, G., Kamal, A., Zikos, T., Nguyen, L., & Clarke, J. O. (2020). Changes in high-resolution manometric diagnosis over time: implications for clinical decision-making. Diseases of the Esophagus : Official Journal of the International Society for Diseases of the Esophagus.

Development of a Preliminary Question Prompt List as a Communication Tool for Adults With Gastroesophageal Reflux Disease: A Modified Delphi Study.
Kamal, A., Katzka, D. A., Achkar, E., Carlson, D., Clarke, J., Fass, R., … Triadafilopoulos, G. (2020). Development of a Preliminary Question Prompt List as a Communication Tool for Adults With Gastroesophageal Reflux Disease: A Modified Delphi Study. Journal of Clinical Gastroenterology.

Esophagogastric Junction Outflow Obstruction: Current Approach to Diagnosis and Management.
Zikos, T. A., Triadafilopoulos, G., & Clarke, J. O. (2020). Esophagogastric Junction Outflow Obstruction: Current Approach to Diagnosis and Management. Current Gastroenterology Reports, 22(2), 9.

Linaclotide for the Treatment of Gastrointestinal Symptoms in Systemic Sclerosis
Dein, E., Clarke, J., Wigley, F., & McMahan, Z. (2019). Linaclotide for the Treatment of Gastrointestinal Symptoms in Systemic Sclerosis. ARTHRITIS & RHEUMATOLOGY, 71.

Autonomic function in gastroparesis and chronic unexplained nausea and vomiting: Relationship with etiology, gastric emptying, and symptom severity.
Nguyen, L., Wilson, L. A., Miriel, L., Pasricha, P. J., Kuo, B., Hasler, W. L., … Abell, T. L. (2020). Autonomic function in gastroparesis and chronic unexplained nausea and vomiting: Relationship with etiology, gastric emptying, and symptom severity. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e13810.

New Developments in the Diagnosis and Management of Gastroesophageal Reflux.
Jiang, Y., & Clarke, J. O. (2020). New Developments in the Diagnosis and Management of Gastroesophageal Reflux. Current Treatment Options in Gastroenterology.

Motility Abnormalities Identified by Wireless Motility Capsule in Postural Orthostatic Tachycardia Syndrome
Zikos, T. A., Zhou, W., Clarke, J. O., Nguyen, L. A., & Neshatian, L. (2019). Motility Abnormalities Identified by Wireless Motility Capsule in Postural Orthostatic Tachycardia Syndrome. AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Long-term outcomes of per-oral endoscopic myotomy compared to laparoscopic Heller myotomy for achalasia: a single-center experience.
Podboy, A. J., Hwang, J. H., Rivas, H., Azagury, D., Hawn, M., Lau, J., … Clarke, J. O. (2020). Long-term outcomes of per-oral endoscopic myotomy compared to laparoscopic Heller myotomy for achalasia: a single-center experience. Surgical Endoscopy.

Marijuana, Ondansetron, and Promethazine Are Perceived as Most Effective Treatments for Gastrointestinal Nausea.
Zikos, T. A., Nguyen, L., Kamal, A., Fernandez-Becker, N., Regalia, K., Nandwani, M., … Clarke, J. O. (2020). Marijuana, Ondansetron, and Promethazine Are Perceived as Most Effective Treatments for Gastrointestinal Nausea. Digestive Diseases and Sciences.

Clinical and immunomodulatory effects of transcutaneous vagal nerve stimulation for idiopathic gastroparesis
Gottfried-Blackmore, A., Namkoong, H., Adler, E. P., Fernandez-Becker, N., Clarke, J., Habtezion, A., & Nguyen, L. (2020). Clinical and immunomodulatory effects of transcutaneous vagal nerve stimulation for idiopathic gastroparesis. NEUROGASTROENTEROLOGY AND MOTILITY. WILEY.

The role of ambulatory 24-hour esophageal manometry in clinical practice.
Kamal, A. N., Clarke, J. O., Oors, J. M., & Bredenoord, A. J. (2020). The role of ambulatory 24-hour esophageal manometry in clinical practice. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e13861.

Diagnosis of gastroesophageal reflux: an update on current and emerging modalities.
Ang, D., Lee, Y.-Y. Y., Clarke, J. O., Lynch, K., Guillaume, A., Onyimba, F., … Gyawali, C. P. (2020). Diagnosis of gastroesophageal reflux: an update on current and emerging modalities. Annals of the New York Academy of Sciences.

How to approach esophagogastric junction outflow obstruction?
Patcharatrakul, T., Alkaddour, A., Pitisuttithum, P., Jangsirikul, S., Vega, K. J., Clarke, J. O., & Gonlachanvit, S. (2020). How to approach esophagogastric junction outflow obstruction? Annals of the New York Academy of Sciences.

Mucosal impedance for esophageal disease: evaluating the evidence.
Clarke, J. O., Ahuja, N. K., Chan, W. W., Gyawali, C. P., Horsley-Silva, J. L., Kamal, A. N., … Xiao, Y. (2020). Mucosal impedance for esophageal disease: evaluating the evidence. Annals of the New York Academy of Sciences.

Non-acid Reflux: When It Matters and Approach to Management.
Zikos, T. A., & Clarke, J. O. (2020). Non-acid Reflux: When It Matters and Approach to Management. Current Gastroenterology Reports, 22(9), 43.

Esophageal physiology-an overview of esophageal disorders from a pathophysiological point of view.
Lottrup, C., Khan, A., Rangan, V., & Clarke, J. O. (2020). Esophageal physiology-an overview of esophageal disorders from a pathophysiological point of view. Annals of the New York Academy of Sciences.

Gastric per-oral endoscopic myotomy for severe post-lung transplant gastroparesis: A single-center experience.
Podboy, A. J., Clarke, J. O., Nguyen, L. A., Mooney, J. J., Dhillon, G. S., & Hwang, J. H. (2020). Gastric per-oral endoscopic myotomy for severe post-lung transplant gastroparesis: A single-center experience. The Journal of Heart and Lung Transplantation : the Official Publication of the International Society for Heart Transplantation.

Use of the Functional Lumen Imaging Probe in Clinical Esophagology.
Savarino, E., di Pietro, M., Bredenoord, A. J., Carlson, D. A., Clarke, J. O., Khan, A., … Gyawali, C. P. (2020). Use of the Functional Lumen Imaging Probe in Clinical Esophagology. The American Journal of Gastroenterology.

The Role of Symptom Association Analysis in Gastroesophageal Reflux Testing.
Kamal, A. N., Clarke, J. O., Oors, J. M., Smout, A. J., & Bredenoord, A. J. (2020). The Role of Symptom Association Analysis in Gastroesophageal Reflux Testing. The American Journal of Gastroenterology.

The functional lumen imaging probe in gastrointestinal disorders: the past, present, and future.
Clarke, J. O., Ahuja, N. K., Fernandez-Becker, N. Q., Gregersen, H., Kamal, A. N., Khan, A., … Vela, M. F. (2020). The functional lumen imaging probe in gastrointestinal disorders: the past, present, and future. Annals of the New York Academy of Sciences.

Occam's Razor: An Unusual Shoulder Mass in a Patient with Achalasia.
Weingarden, A. R., Villescas, V., Clarke, J., & Triadafilopoulos, G. (2020). Occam's Razor: An Unusual Shoulder Mass in a Patient with Achalasia. Digestive Diseases and Sciences.

Gastric antral vascular ectasia in systemic sclerosis: Association with anti-RNA polymerase III and negative anti-nuclear antibodies.
Serling-Boyd, N., Chung, M. P.-S., Li, S., Becker, L., Fernandez-Becker, N., Clarke, J., … Chung, L. (2020). Gastric antral vascular ectasia in systemic sclerosis: Association with anti-RNA polymerase III and negative anti-nuclear antibodies. Seminars in Arthritis and Rheumatism, 50(5), 938–42.

Type II Achalasia Is Increasing in Prevalence.
Zhou, M. J., Kamal, A., Freedberg, D. E., Markowitz, D., Clarke, J. O., & Jodorkovsky, D. (2020). Type II Achalasia Is Increasing in Prevalence. Digestive Diseases and Sciences.

Patient Reported Outcomes and Objective Swallowing Assessments in a Multidisciplinary Dysphagia Clinic.
Dewan, K., Clarke, J. O., Kamal, A. N., Nandwani, M., & Starmer, H. M. (2020). Patient Reported Outcomes and Objective Swallowing Assessments in a Multidisciplinary Dysphagia Clinic. The Laryngoscope.

Achalasia: physiology and diagnosis.
Rieder, E., Fernandez-Becker, N. Q., Sarosiek, J., Guillaume, A., Azagury, D. E., & Clarke, J. O. (2020). Achalasia: physiology and diagnosis. Annals of the New York Academy of Sciences.

Baseline impedance via manometry and ambulatory reflux testing are not equivalent when utilized in the evaluation of potential extra-esophageal gastroesophageal reflux disease.
Zikos, T. A., Triadafilopoulos, G., Kamal, A., Podboy, A., Sonu, I. S., Regalia, K. A., … Clarke, J. O. (2020). Baseline impedance via manometry and ambulatory reflux testing are not equivalent when utilized in the evaluation of potential extra-esophageal gastroesophageal reflux disease. Journal of Thoracic Disease, 12(10), 5628–38.

Regional Gastrointestinal Transit and Contractility Patterns Vary in Postural Orthostatic Tachycardia Syndrome (POTS).
Zhou, W., Zikos, T. A., Clarke, J. O., Nguyen, L. A., Triadafilopoulos, G., & Neshatian, L. (2021). Regional Gastrointestinal Transit and Contractility Patterns Vary in Postural Orthostatic Tachycardia Syndrome (POTS). Digestive Diseases and Sciences.

Development of quality indicators for the diagnosis and management of achalasia.
Kamal, A. N., Kathpalia, P., Otaki, F., Bredenoord, A. J., Castell, D. O., Clarke, J. O., … Leiman, D. A. (2021). Development of quality indicators for the diagnosis and management of achalasia. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e14118.

The Stanford Multidisciplinary Swallowing Disorders Center.
Nandwani, M., Dewan, K., Starmer, H., Kamal, A. N., & Clarke, J. O. (2021). The Stanford Multidisciplinary Swallowing Disorders Center. Clinical Gastroenterology and Hepatology : the Official Clinical Practice Journal of the American Gastroenterological Association.

Gastric Mucosal Immune Profiling and Dysregulation in Idiopathic Gastroparesis.
Gottfried-Blackmore, A., Namkoong, H., Adler, E., Martin, B., Gubatan, J., Fernandez-Becker, N., … Habtezion, A. (2021). Gastric Mucosal Immune Profiling and Dysregulation in Idiopathic Gastroparesis. Clinical and Translational Gastroenterology, 12(5), e00349.

Question Prompt List as a Communication Tool for Adults with Gastroesophageal Reflux Disease Incorporation of Patients' Perspectives.
Kamal, A., Achkar, E., Carlson, D., Clarke, J., Fass, R., Gyawali, C. P., … Triadafilopoulos, G. (2021). Question Prompt List as a Communication Tool for Adults with Gastroesophageal Reflux Disease Incorporation of Patients' Perspectives. Journal of Clinical Gastroenterology.

Classifying Esophageal Motility by FLIP Panometry: A Study of 722 Subjects With Manometry.
Carlson, D. A., Gyawali, C. P., Khan, A., Yadlapati, R., Chen, J., Chokshi, R. V., … Pandolfino, J. E. (2021). Classifying Esophageal Motility by FLIP Panometry: A Study of 722 Subjects With Manometry. The American Journal of Gastroenterology.

A Comprehensive Approach to Esophageal Symptoms and Disorders.
Clarke, J. O. (2021). A Comprehensive Approach to Esophageal Symptoms and Disorders. Gastroenterology Clinics of North America, 50(4), xiii-xiv.

Scleroderma and the Esophagus.
Ahuja, N. K., & Clarke, J. O. (2021). Scleroderma and the Esophagus. Gastroenterology Clinics of North America, 50(4), 905–918.

The Effects of Intermittent Fasting on Gastroesophageal Reflux Disease
Jiang, Y., Goodman, S., Sonu, I., Garcia, P., Fernandez-Becker, N., Kamal, A., … Clarke, J. (2021). The Effects of Intermittent Fasting on Gastroesophageal Reflux Disease. AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Development of a Preliminary Question Prompt List as a Communication Tool for Adults With Achalasia: A Modified Delphi Study.
Zhuo, J., Triadafilopoulos, G., Bredenoord, A. J., Clarke, J. O., Fass, R., Gyawali, C. P., … Kamal, A. N. (2022). Development of a Preliminary Question Prompt List as a Communication Tool for Adults With Achalasia: A Modified Delphi Study. Journal of Clinical Gastroenterology.

Intra-subject Variability in High Resolution Anorectal Manometry Using the London Classification: Diagnostic and Therapeutic Implications.
Triadafilopoulos, G., Clarke, J. O., Kamal, A., & Neshatian, L. (2022). Intra-subject Variability in High Resolution Anorectal Manometry Using the London Classification: Diagnostic and Therapeutic Implications. Digestive Diseases and Sciences.

Quantitative assessment of multichannel intraluminal impedance pH and its clinical implications.
Koo, E., Clarke, J. O., Yang, B., Pasricha, P. J., & Zhang, N. (2022). Quantitative assessment of multichannel intraluminal impedance pH and its clinical implications. Physiological Reports, 10(4), e15199.

Model for multi-disciplinary, multi-institutional virtual learning: The Stanford Esophageal Virtual Collaborative Conference on benign esophageal diseases.
Kamal, A. N., Triadafilopoulos, G., Gyawali, C. P., Nguyen, L., Sayuk, G. S., Azagury, D. E., … Clarke, J. O. (2022). Model for multi-disciplinary, multi-institutional virtual learning: The Stanford Esophageal Virtual Collaborative Conference on benign esophageal diseases. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e14369.

Prevention of Esophageal Cancer.
Clarke, J. (2021). Prevention of Esophageal Cancer. Gastroenterology & Hepatology, 17(12), 609–611.

Clinical role of ambulatory reflux monitoring in PPI non-responders: Recommendation statements.
Yadlapati, R., Gawron, A. J., Gyawali, C. P., Chen, J., Clarke, J., Fass, R., … Pandolfino, J. E. (2022). Clinical role of ambulatory reflux monitoring in PPI non-responders: Recommendation statements. Alimentary Pharmacology & Therapeutics.

Best Practices in Treatment of Laryngopharyngeal Reflux Disease: A Multidisciplinary Modified Delphi Study.
Kamal, A. N., Dhar, S. I., Bock, J. M., Clarke, J. O., Lechien, J. R., Allen, J., … Akst, L. M. (2022). Best Practices in Treatment of Laryngopharyngeal Reflux Disease: A Multidisciplinary Modified Delphi Study. Digestive Diseases and Sciences.

Healthcare Disparities in Gastroesophageal Reflux Disease for Hispanic and Latino Americans: A Solution-Oriented Approach for Improvement.
Kamal, A. N., Wang, C. J., Triadafilopoulos, G., & Clarke, J. O. (2022). Healthcare Disparities in Gastroesophageal Reflux Disease for Hispanic and Latino Americans: A Solution-Oriented Approach for Improvement. The American Journal of Gastroenterology.

Clinical and manometric characteristics of patients with oesophagogastric outflow obstruction: towards a new classification
Triadafilopoulos, G., & Clarke, J. O. (2018). Clinical and manometric characteristics of patients with oesophagogastric outflow obstruction: towards a new classification. BMJ OPEN GASTROENTEROLOGY, 5(1).

Inter- and intra-rater agreement of interpretation of functional lumen imaging probe in healthy subjects.
Yadlapati, R., Gyawali, C. P., Carlson, D. A., Pandolfino, J. E., Fass, R., Khan, A., … Clarke, J. O. (2022). Inter- and intra-rater agreement of interpretation of functional lumen imaging probe in healthy subjects. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e14505.

Helping Patients with Gastroparesis
Onyimba, F. U., & Clarke, J. O. (2019). Helping Patients with Gastroparesis. MEDICAL CLINICS OF NORTH AMERICA, 103(1), 71-+.

Value of 96-hour ambulatory esophageal pH monitoring in the assessment of patients with refractory acid reflux symptoms and their response to anti-reflux diet.
Triadafilopoulos, G., Kamal, A., & Clarke, J. O. (2022). Value of 96-hour ambulatory esophageal pH monitoring in the assessment of patients with refractory acid reflux symptoms and their response to anti-reflux diet. Diseases of the Esophagus : Official Journal of the International Society for Diseases of the Esophagus.

The Impact of Intermittent Fasting on Patients With Suspected Gastroesophageal Reflux Disease.
Jiang, Y., Sonu, I., Garcia, P., Fernandez-Becker, N. Q., Kamal, A. N., Zikos, T. A., … Clarke, J. O. (2022). The Impact of Intermittent Fasting on Patients With Suspected Gastroesophageal Reflux Disease. Journal of Clinical Gastroenterology.

A Delphi Method for Development of a Barrett's Esophagus Question Prompt List as a Communication Tool for Optimal Patient-physician Communication.
Kamal, A. N., Wang, C.-H. J., Triadafilopoulos, G., Diehl, D. L., DuCoin, C., Dunst, C. M., … Clarke, J. O. (2023). A Delphi Method for Development of a Barrett's Esophagus Question Prompt List as a Communication Tool for Optimal Patient-physician Communication. Journal of Clinical Gastroenterology.

Barriers and Facilitators to Shared Decision-Making Implementation in the Management of Esophageal Diseases: A Mixed Methods Study
Achalu, S., Berry, R., Triadafilopoulos, G., Clarke, J. O., & Kamal, A. N. (2022). Barriers and Facilitators to Shared Decision-Making Implementation in the Management of Esophageal Diseases: A Mixed Methods Study. AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Patient Perspective and Feedback on a Dysphagia-Specific Question Prompt List (QPL) Communication Tool
Achalu, S., Berry, R., Triadafilopoulos, G., Vela, M. F., Savarino, E., Roman, S., … Kamal, A. N. (2022). Patient Perspective and Feedback on a Dysphagia-Specific Question Prompt List (QPL) Communication Tool. AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Variations in Barrett's Esophagus Screening, Diagnosis, and Management Among Experts: Myth or Reality?
Kahn, A., Iyer, P. G., Clarke, J. O., & Kamal, A. N. (2022). Variations in Barrett's Esophagus Screening, Diagnosis, and Management Among Experts: Myth or Reality? AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Quality Indicator Development for the Approach to Ineffective Esophageal Motility: A Modified Delphi Study
Kamal, A. N., Kathpalia, P., Leiman, D. A., Bredenoord, A., Clarke, J. O., Gyawali, C. P., … Otaki, F. (2022). Quality Indicator Development for the Approach to Ineffective Esophageal Motility: A Modified Delphi Study. AMERICAN JOURNAL OF GASTROENTEROLOGY. LIPPINCOTT WILLIAMS & WILKINS.

Interrater Reliability of Functional Lumen Imaging Probe (FLIP) Panometry and High-Resolution Manometry for Assessment of Esophageal Motility Disorders.
Chen, J. W., Khan, A., Chokshi, R. V., Clarke, J. O., Fass, R., Garza, J. M., … Carlson, D. A. (2023). Interrater Reliability of Functional Lumen Imaging Probe (FLIP) Panometry and High-Resolution Manometry for Assessment of Esophageal Motility Disorders. The American Journal of Gastroenterology.

Development and modification of a dysphagia question prompt list to improve patient-physician communication: Incorporating both esophageal expert and patient perspectives.
Achalu, S., Berry, R., Zhuo, J., Bredenoord, A. J., Clarke, J. O., Fass, R., … Kamal, A. N. (2023). Development and modification of a dysphagia question prompt list to improve patient-physician communication: Incorporating both esophageal expert and patient perspectives. Neurogastroenterology and Motility : the Official Journal of the European Gastrointestinal Motility Society, e14600.

Clinical Trials

Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.

Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.

Open Trials Closed Trials

Functional Luminal Imaging Probe (FLIP) Topography Use in Patients With Scleroderma and Trouble Swallowing »

Specializing In

Esophageal manometry
Esophageal Manometry
Esophageal motility disorders including spasm
Esophagogastroduodenoscopy (EGD)
Gastric Electrical Stimulation
Gastric Pacemaker
Gastrostomy (Feeding) Tube
Motility Disorders
Non-cardiac chest pain
Other endoscopic procedures
Paraesophageal Hernias
Sigmoidoscopy
Small bowel manometry
Upper GI endoscopy

Practice Locations

Digestive Health Center in Redwood City Redwood City, CA

Redwood City, CA

Digestive Health Center in Redwood City

420 Broadway Street, Pavilion D, 2nd Floor

Redwood City , CA 94063

(650) 736-5555

More Clinic Information »

Esophagus Center Redwood City, CA

Redwood City, CA

Esophagus Center

420 Broadway Street, Pavilion D, 2nd Floor

Redwood City , CA 94063

(650) 736-5555

More Clinic Information »

Amyloid Center Stanford, CA

Stanford, CA

Amyloid Center

300 Pasteur Drive , 2nd Floor, Room A260

Stanford , CA 94305

(650) 725-6186

More Clinic Information »

General Endoscopy Redwood City, CA

Redwood City, CA

General Endoscopy

420 Broadway Street, Pavilion D, 2nd Floor

Redwood City , CA 94063

(650) 736-5555

More Clinic Information »

Important Information about Our Organizations and Physician Affiliation

Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are each independent nonprofit organizations that are affiliated with but separate from each other and from Stanford University. The physicians who provide care at facilities operated by Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners are faculty, foundation, or community physicians who are not employees, representatives, or agents of Stanford Health Care, Stanford Health Care Tri- Valley, or Stanford Medicine Partners. Stanford Health Care, Stanford Health Care Tri-Valley, and Stanford Medicine Partners do not exercise control over the care provided by such faculty, foundation, and community physicians and are not responsible for their actions.

Patient Ratings

(150 Ratings)

Overall Rating

5.0/5

View Ratings by Category

5.0/5

Friendliness

5.0/5

Explanations

5.0/5

Listens

5.0/5

Care provider's efforts to include you in decisions about your care

5.0/5

Recommended to others

0.0/5

Wait times

How Our Ratings Work

The Patients Ratings and comments are gathered from our Patient Satisfaction Survey and displayed in their entirety.

Patient Satisfaction Survey Disclaimer

Patient Reviews

(325 reviews)

Dr. John Clarke is an excellent Gastrointrologist - he is professional, kind, caring, listens well and offers good advise. He takes time to explain things and just a great doctor. I give Dr. Clarke five stars for the best Gastrointrologist!

Mar 2023

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Verified SHC Patient

Seems like a great doctor. Listens. Asks useful questions. Communicates effectively. Personable. The kind of guy you want to buy a beer and see a Sharks game with.

Mar 2023

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Verified SHC Patient

He was knowledgeable and explained process and procedures very well.

Mar 2023

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Verified SHC Patient

After many years of futile efforts to control my GERD, I have realized that I should seek professional help. I switched my GI care to Dr. Clarke six months ago. He performed an upper endoscopy with a 96-hour wireless pH probe. Remarkably, he performed the test himself from end to end to get a better appreciation of my condition. The test results pointed to my regimen (high pH diet, 20MG omeprazole every other day, and active exercise routine) as the prime culprit for my GERD symptom flare-ups. I have made necessary adjustments to my regimen (switching to 20MG omeprazole daily and easing the exercise routine) and achieved marked improvement in my life quality. The follow-up endoscopy test performed by Dr. Clarke confirmed that the previously seen reflux esophagitis had entirely healed, but a moderate hiatal hernia persisted and biopsied tissues revealed many years of abuse. In a separate video conference, Dr. Clarke reviewed the issues with me and provided specific recommendations. Dr. Clarkeâ€™s methodical and thorough approach has been a breath of fresh air. I profusely thank Dr. Clarke and his staff for their dedication to high-quality GI care. It would be very remiss of me not to give special plaudits to Dr. Clarkeâ€™s nurse Lily for very fruitful communications.

Mar 2023

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Verified SHC Patient

Very easy to understand and was able to answer my questions.

Mar 2023

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Verified SHC Patient

Dr. Clarke is super nice! Iâ€™m very grateful for Dr. Clarke as my GI doctor. Heâ€™s knowledgeable and gentle. Thank you Dr. Clarke!!!

Feb 2023

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Verified SHC Patient

Great!

Feb 2023

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Verified SHC Patient

Dr Clarke is an exceptional Doctor and likable person. I have full confidence in him and his great team.

Feb 2023

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Verified SHC Patient

Very nice, he explained things very well

Feb 2023

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Verified SHC Patient

Professional courteous excellent healthcare

Feb 2023

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Verified SHC Patient

Dr. Clarke was very thorough and reasonable. He took his time and looked over some of my test results which helped me to understand what they meant. I appreciated his approach to my problem and feel so much more at ease having had a consult with him

Feb 2023

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Verified SHC Patient

Dr Clarke is very personable and listens/addresses your concerns throughly. He puts you at ease right away. He is clear in his communication and recommendations.

Feb 2023

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Verified SHC Patient

Great guy, personable and explained things so I could understand

Feb 2023

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Verified SHC Patient

Dr. Clarke is a very kind human being and a doctor. I hope he lives a long and healthy life so he can serve many, many patients who are suffering.

Feb 2023

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Verified SHC Patient

I had a great video appointment with Dr John Clarke. My appointment also included one of Dr Clarksâ€™ colleagues. The appointment was collaborative and not only were all my questions answered, but Dr Clark treated me with respect, and was empathetic and made me feel cared for. He listened to any concerns that I had, explained everything clearly so both my husband I understood and was extremely helpful! Dr Clarke has a great bedside manner in which he was very personable and a great listener who went above and beyond what I expected. The very next day, which was a Saturday, I received both an email and a text message that stated I had a procedure scheduled and to contact the number provided for all the information! I couldnâ€™t believe it. I was so over joyed. Couldnâ€™t be happier. Thank you Dr John Clark and Staff.

Feb 2023

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Verified SHC Patient

Very sweet, and I am confident that he can help me. Thank you so much!

Feb 2023

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Verified SHC Patient

My visit with Dr. Clarke went exceptionally well. I would definitely recommend him.

Feb 2023

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Verified SHC Patient

He Listens and explains when I ask a question. I always feel Iâ€™m in good hands with Dr Clarke

Jan 2023

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Verified SHC Patient

Wonderful professional

Jan 2023

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Verified SHC Patient

Excellent

Jan 2023

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Verified SHC Patient

Dr Clark is a supurb physician.. It is ibvuious he cares about his patient, knows his field, and can communicate with hid patient in language the patient on the patient level.. I have been lucky to have hadm excellent doctors throughout my adult life and Dr Clark is one of the best of the best.

Jan 2023

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Verified SHC Patient

I had a very good video visit with Dr. Clarke. He was prepared, thorough, clear, and considerate, an excellent doctor.

Jan 2023

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Verified SHC Patient

Dr Clarke listens to what I say and responds to my concerns.

Jan 2023

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Verified SHC Patient

Thank you for your excellent care

Jan 2023

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Verified SHC Patient

He is a great Doctor treated me very well and was really nice and patient with me.

Dec 2022

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Verified SHC Patient

efficient and well done on every level

Dec 2022

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Verified SHC Patient

Dr. Clarke is the most compassionate, thoughtful and expert medical practitioner I've ever encountered. Thank you!

Dec 2022

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Verified SHC Patient

I was very pleased with Dr. Clarke. He took the time to evaluate me and my issue. He did not rush, was thorough and very caring. I was very comfortable talking to him. He discussed the results of my endoscopy, the medications I am taking and options that are available.

Dec 2022

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Verified SHC Patient

Doctor and PA very knowledgeable in their field of practice.

Dec 2022

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Verified SHC Patient

Great doctor, kind and understanding

Dec 2022

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Verified SHC Patient

Excellent provider!

Dec 2022

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Verified SHC Patient

Possesses knowledge about digestive disorders and what directions for proceeding with related healthcare.

Dec 2022

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Verified SHC Patient

Listener, patient, have diffetent options and great at all

Nov 2022

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Verified SHC Patient

Dr Clarke has been great! Incredibly helpful and insightful. I appreciate all of his advice/feedback/concern.

Nov 2022

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Verified SHC Patient

He is an excellent doctor, compassionate, and always pleasant to talk to, I am so lucky to have him as a provider. He is the reason I come to Stanford.

Nov 2022

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Verified SHC Patient

Dr. Clarke was incredibly professional and attentive. His positive and welcoming demeanor was greatly appreciate. Overwhelmingly positive experience.

Nov 2022

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Verified SHC Patient

Dr. Clarke is one of the most caring, compassionate, professional, and knowledgeable Doctors I've met in my 10 1/2 year journey. I suppose not so much a health journey but nightmare given I've been misdiagnosed 5 times. I would not give a MD an "A+" rating after all I've been through but Dr. Clarke is a MD and man that can and does carry the mantle of greatness. He is not only trying to create a plan for my (many) digestive health issues, he's seeking to link my overall (holistic and functional).health. I am in Palliative Care and Dr. Clarke and I share a singular vision: better my quality of life in any way feasible. Truly, I'm thankful for Dr. Clarke and his Team.

Nov 2022

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Verified SHC Patient

Thank you for all you do

Nov 2022

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Verified SHC Patient

Seamed like very nice Dr.and had some ideas how to help me. Looking forward to talking with him again.

Nov 2022

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Verified SHC Patient

Dr. Clark was very thorough, very knowledgeable, very nice, he listened and answered all my questions, and explained all procedures.

Oct 2022

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Verified SHC Patient

Great provider, very attentive , takes his time explaining and answering questions. He is very thorough.

Oct 2022

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Verified SHC Patient

John Clarke is careful, thorough and easy to talk with. He's an excellent clinician and I'm delighted to be one of his patients.

Oct 2022

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Verified SHC Patient

We are extremely happy that we are under Dr. Clarke's care.

Oct 2022

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Verified SHC Patient

I appreciate the promptness and courtesy with which i was treated.

Oct 2022

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Verified SHC Patient

I think he's great! Dr. Clarke listens well, answers my quesitons thoughtfully, gives expert advice on future health guidelines for me. I always feel like he is truly looking out for my best interests.

Oct 2022

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Verified SHC Patient

Thank you once again for your support, thoughts, suggestions, openness to patient thoughts and current research for treatment direction. Dr.Clark is also a great listener and has compassion for his patients.

Oct 2022

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Verified SHC Patient

Dr. Clark was very pleasant and helpful in explaining the procedure and all that is involved. Appreciate his honesty and discussion of my symptoms, next steps, which alleviated my concerns going forward when necessary.

Oct 2022

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Verified SHC Patient

Excellent health care provider. Is straight forward and easy to comprehend his rationale in the recommended treatment.

Oct 2022

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Verified SHC Patient

Dr. Clark is very respectful and knowledgeable. I appreciate his Medical advice very much. We are happy we found him and had his guidance.

Oct 2022

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Verified SHC Patient

He is a great listener very knowledgeable reassuring and I look forward to his help w my care regarding this visit.

Oct 2022

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Verified SHC Patient

He was sincere and asked questions about my symptoms.

Oct 2022

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Verified SHC Patient

Wonderful. Perfect.

Oct 2022

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Verified SHC Patient

Dr. Clarke is an excellent doctor, I'm so grateful to have found him. He is very knowledgeable and communicates easily about my health concerns. I have a very high level of confidence in the information I receive from him. I'm also regularly impressed with the care he shows for his patients, and the way he advocates for his patients, and explores new ways to improve care from me technology and research.

Sep 2022

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Verified SHC Patient

Dr. Clarke is a wonderful doctor.

Sep 2022

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Verified SHC Patient

Very thorough and easy to communicate with. He took the time to cover all items of concern to me.

Sep 2022

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Verified SHC Patient

Dr Clark listened and provided proactive advice...rarely happens with other doc

Sep 2022

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Verified SHC Patient

Dr. Clarke, I really appreciate you taking the time to explain my test results thoroughly yesterday. It's always a pleasure to speak with you, be it in person or virtual. Thanks again!

Sep 2022

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Verified SHC Patient

Best appt Iâ€™ve had in years

Sep 2022

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Verified SHC Patient

Excellent consultation! Dr Clarke is a fount!

Aug 2022

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Verified SHC Patient

He is a wonderful doctor look like is taking care of his patients

Aug 2022

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Verified SHC Patient

Wonderful experience With Stanford wonderful doctors and helpful staff I recommend everyone

Aug 2022

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Verified SHC Patient

Dr. Clarke is so excellent and knowledgeable, I am grateful for his whole team. Patient, and kind.

Aug 2022

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Verified SHC Patient

Very professional. Cares how I feel .!

Aug 2022

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Verified SHC Patient

Trustworthy, specialized doctor Who is personable, warm and caring.

Aug 2022

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Verified SHC Patient

Dr. is very thorough and spent time with me to explain my conditions and treatments in details.

Aug 2022

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Verified SHC Patient

amazing. took the time to listen to me. i did not feel rushed at all.

Aug 2022

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Verified SHC Patient

Dr. Clarke and his team have worked so very hard for me to help me regain a semi-normal life! His kindness and his willingness to try less aggressive things first really makes me trust him as a Dr. and not just a medicine pusher. He explains things, is understanding and I will forever be grateful to him for figuring simpler solutions to my complicated issues. He also gave me hope that I can live a long life even while on a formula if things ever came to that. He really is a great Dr. and should be given a really nice vacation! ha ha!

Aug 2022

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Verified SHC Patient

Very knowledgeable about topic of discussion. Gave me time to ask questions at the end.

Aug 2022

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Verified SHC Patient

Dr Clarke is awesome! Knowledgeable, engaged, kind, patient, personable, trustworthy, and an excellent listener.

Aug 2022

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Verified SHC Patient

He is very nice

Aug 2022

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Verified SHC Patient

I have utmost confidence in Dr. Clarke and am more than happy to have him as my doctor. Dr. Clarke treats me with great care and compassion as well as expertise. I appreciate how clear, concise and effective he is in his communication and that he keeps me abreast of current medical news pertinent to my condition. I feel very well cared for by Dr. Clarke and his team.

Aug 2022

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Verified SHC Patient

He is a very good listener, smart and very kind. Really seems like he cares. Good guy and dr.

Jul 2022

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Verified SHC Patient

Very excellent Doctor.

Jul 2022

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Verified SHC Patient

I really appreciate Dr. Clarke's experience and support to my daughter's care.

Jul 2022

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Verified SHC Patient

Dr. Clarke is an outstanding doctor. He cares about my concerns and always listens attentively. He is very nice and kind. I feel very fortunate that he is helping me improve my health.

Jul 2022

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Verified SHC Patient

Dr. Clark always gives cutting edge, comprehensive consults in a manner I can understand. He is very compassionate, caring and good listener. I am grateful for Stanford Health having such an outstanding and talented doctor to provide care to their patients.

Jun 2022

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Verified SHC Patient

He is a very good doctor.. diagnosed in the right path .. gives adequate time for the problem and really caring

Jun 2022

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Verified SHC Patient

Dr. Clark and his assistant were very understanding and thorough. Great!

Jun 2022

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Verified SHC Patient

Dr. Clarke is a warm, compassionate and highly skilled doctor. He is patient-centered, took detailed, brought forward ideas that could be helpful, and approached the appointment with deep respect and collaboration.

Jun 2022

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Verified SHC Patient

Great "bedside manner" and really listened. I felt like he heard me and understood my concerns completely. I felt like a part of a team and we would be working on a solution together, no doing just what he wanted. We need more doctor's like Dr. Clark.

Jun 2022

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Verified SHC Patient

Great doctor. Good listener. Explains well. Didn't rush.

Jun 2022

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Verified SHC Patient

He is a great surgeon and very kind

Jun 2022

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Verified SHC Patient

He is very kind, pleasant, easy to talk to and made me feel comfortable immediately!!!!

Jun 2022

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Verified SHC Patient

I like him very much. He was very thorough and understanding. Also he knowledgeable.

Jun 2022

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Verified SHC Patient

Very caring and thorough Drs.

Jun 2022

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Verified SHC Patient

Very knowledgeable and friendly and helpful

Jun 2022

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Verified SHC Patient

Dr. Clarke is always kind and friendly while also being very professional. He doesn't seem rushed and takes the time to answer questions and address my concerns. I look forward to our appointments because I always come away with useful information and confidence that I am in good care.

Jun 2022

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Verified SHC Patient

Excellent listener. Very personable and clear.

Jun 2022

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Verified SHC Patient

I have the utmost faith in his capabilities and trust his judgment in what we should do in the future for my medical situation.

May 2022

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Verified SHC Patient

Dr Clarke and his staff (Monica and Melissa) were very polite and thorough during my initial appt. I was very impressed with their explanations and their knowledge of my health concerns. I felt very confident in their abilities to provide the best care and to do for me whatâ€™s in my best interest. Amazing visit

May 2022

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Verified SHC Patient

He's a terrific caring doctor.

May 2022

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Verified SHC Patient

Excellent and caring provider!

May 2022

•

Verified SHC Patient

What an excellent doctor! He was very friendly and clear throughout the visit. He asked questions and was patient and encouraging with my answers. He was also very detailed and helpful with his replies to my queries. He was able to address my concerns with much care and was able to provide information clearly to my husband and I.

May 2022

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Verified SHC Patient

He is a great listener for my concerns.

May 2022

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Verified SHC Patient

He listens. He takes his time. He makes sure I understand.

May 2022

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Verified SHC Patient

Very impressed with Dr. Clarke & support members!

May 2022

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Verified SHC Patient

Careful analysis of my belching problem with suggestions to modify the situation.

May 2022

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Verified SHC Patient

Dr. Clarke was great - he truly cared about my health and medical condition and answered all my questions.

May 2022

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Verified SHC Patient

Dr. Clark was quite thorough in discussing my condition and in recommending next steps in a plan of care. He was very positive and easy to talk to and open to my thoughts. Additionally, the person that conducted an interview with me before meeting with Dr. Clark was also very pleasant and thorough. .

May 2022

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Verified SHC Patient

Dr. Clarke is always excellent. He's kind, caring and a good listener. I have the utmost confidence in him.

May 2022

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Verified SHC Patient

Excellent Dr!!!!! Extremely thrilled to be under his care!

May 2022

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Verified SHC Patient

My visit to Dr Clarke was: 1. Without the presence and questioning of associates doctor which saves time of the visit; 2.the visit was structured really well- I was asked about the current conditions and it was compared with the previous visit, definitely some progress occurred. The treatment is on the right track.3. The doctor is a very good listener. The visit was very pleased.

May 2022

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Verified SHC Patient

Dr. Clarke has wonderful "bedside" manners. He listens patiently to what I have to say, he speaks clearly and calmly, and I always feel that he values and respects my questions, which he always answers. I have been treated by a lot of doctors for a variety of reasons, but very rarely I have felt as respected and understood by a doctor as I do with Dr. Clarke.

May 2022

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Verified SHC Patient

Very attentive with patience to explain thoroughly

May 2022

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Verified SHC Patient

Dr Clark and his staff extremely Nice and Awesome

May 2022

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Verified SHC Patient

Dr. Clark was very nice and understanding

May 2022

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Verified SHC Patient

Dr. Clarke is not only a professional but also an understanding individual. He is in tune with his patients. He asks pertinent questions and explains procedures in a way that the patient is able to understand. I would definitely recommend Dr. Clarke to anyone. He is the BEST.

May 2022

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Verified SHC Patient

Heâ€™s an excellent doctor.

May 2022

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Verified SHC Patient

First visit, very impressed. Look forward to seeing him again.

May 2022

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Verified SHC Patient

Dr. Clark is a grate doctor and a wonderful person

Apr 2022

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Verified SHC Patient

Dr. Clarke is a pleasure to deal with. He's knowledgeable, personable and an excellent physician.

Apr 2022

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Verified SHC Patient

I really liked him and his assistant. He understood my issues and had thoroughly reviewed my past history and tests.

Apr 2022

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Verified SHC Patient

He is an excellent Doctor. He answered all my questions and then some. dr. Clarke is very thorough.

Apr 2022

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Verified SHC Patient

Dr Clarke was one of the most knowledgeable and caring doctors I have seen. I feel very fortunate to have met him and look forward to working with him on my conditions.

Apr 2022

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Verified SHC Patient

He is very patient friendly and a fine Physician.

Apr 2022

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Verified SHC Patient

I felt really lucky and relived after talking to Dr. Clarke

Apr 2022

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Verified SHC Patient

Very glad he's my doctor!

Apr 2022

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Verified SHC Patient

Dr Clarke was courteous, attentive, excellent communicator, professional, and consistently responded with empathy. It was clear that he had prepared for the visit having read the past history. The decision/conclusion we made was the result of a collaborative process which Dr Clarke encouraged.

Apr 2022

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Verified SHC Patient

Dr. Clarke is wonderful and takes his time to answer questions. The staff are also very helpful.

Apr 2022

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Verified SHC Patient

Dr. Clarke was very professional and knowledgeable. He came into the visit very obviously educated on my medical history and it was obvious he had read my past medical history notes. He heard me as a patient and was very attentive in listening to my concerns. I would recommend him to anyone.

Apr 2022

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Verified SHC Patient

Love the guy. Talks to me as an equal. Does not dumb down the conversation like some other doctors do and also includes me in the treatment decision making process. Takes my comments and concerns and ideas seriously.

Apr 2022

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Verified SHC Patient

Dr. Clarke is one of the best doctors that has helped me with my health care. I appreciate all that he has done for me.

Mar 2022

•

Verified SHC Patient

Dr. Clarke is very patient to explain my issues. I am 100% confident on his professionalism..

Mar 2022

•

Verified SHC Patient

Dr. Clarke is great.

Mar 2022

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Verified SHC Patient

He is a consummate professional and warm and compassionate . He is also a great listener and inspires confidence. I feel very lucky to have him as a doctor.

Mar 2022

•

Verified SHC Patient

Dr. Clarke answered all my questions carefully and thoughtfully. I really appreciate having Dr. Clarke as one of my doctors.

Mar 2022

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Verified SHC Patient

Nice visit. Explained everything very well

Mar 2022

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Verified SHC Patient

The Dr and the NP were extremely knowledgable and were able understand my issues and concerns and did everything possible to address them. Extremely happy with the visit

Mar 2022

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Verified SHC Patient

Very personal and great focus

Mar 2022

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Verified SHC Patient

He was very thorough and answered all my questions. I am grateful he is willing to take me as a patient. I feel very comfortable having him perform my procedures.

Mar 2022

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Verified SHC Patient

Thank you for llistening and agreeing to take on the whole gastric "experience " ...the local guys are just not you! ðŸ™

Mar 2022

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Verified SHC Patient

EXCELLENT CARE GOOD VISIT

Mar 2022

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Verified SHC Patient

Excellent doctor

Feb 2022

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Verified SHC Patient

He took time to explain his thinking and the plan forward. Quality guidance.

Feb 2022

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Verified SHC Patient

He is an excellent physician and actually listens to the patient. He is very patient and understanding.

Feb 2022

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Verified SHC Patient

Iâ€™ve been to 6 GI drs over the past 1.5 yrs. I FINALLY feel like Iâ€™m in good hands and will begin to finally find some answers! The fellow that spoke to me today was super as well! She was so personable, listened, and very caring! My faith is being restored in Stanford after bad experiences in the past. Dr Clarke was fantastic! Heâ€™s taking the bull by the horns in a methodical way and I like that! He said my case is challenging but he likes that and I felt like heâ€™ll get to the bottom of things! Such a great visit!!

Feb 2022

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Verified SHC Patient

Clear, knowledgeable, open.

Feb 2022

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Verified SHC Patient

Very professional, knowledgeable, and made sure I understood him . He showed me that he cared about me and my problem.

Feb 2022

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Verified SHC Patient

Excellent consultation

Feb 2022

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Verified SHC Patient

He is a great Physician and a nice person

Feb 2022

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Verified SHC Patient

Very good to see Dr. Clarke & all the familiar faces as it had been awhile since Covid.

Feb 2022

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Verified SHC Patient

Dr. Clarke is a wonderful doctor. We travel a great distance (3 hours) to see him and will continue to do so. He is organized but also very friendly and helpful. He is conservative which is always a thoughtful way to treat symptoms that might be helped with certain foods.

Jan 2022

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Verified SHC Patient

Dr. Clarke is excellent! He listens and clearly explains things. He is the only doctor that I've ever seen that I would drive 2 hours to see.

Jan 2022

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Verified SHC Patient

He is Awesomeness!

Jan 2022

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Verified SHC Patient

Very approachable, listens, educates while discussing options to assist in pts plan of care

Jan 2022

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Verified SHC Patient

He's thoughtful, knowledgeable and patient. A good specialist.

Jan 2022

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Verified SHC Patient

I think he is a very caring able Dr.

Jan 2022

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Verified SHC Patient

Thank you, Dr. Clarke.

Jan 2022

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Verified SHC Patient

As always pleasant, asked many questions, and discussed my condition. He had several suggestions, and requested follow-up communication if any difficulties arose.

Jan 2022

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Verified SHC Patient

He was very thorough and listened to us

Jan 2022

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Verified SHC Patient

We love Dr. Clarke and how well he understands my daughter's case.

Jan 2022

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Verified SHC Patient

Dr. Clarke listened very carefully to all my concerns before recommending treatment. He is patient and knowledgeable. He was very kind and understanding. I really appreciate all his help and I am very happy he is helping me feel better. Thank you! :D

Jan 2022

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Verified SHC Patient

Thank you very much. Friendly, informative, encouraging.

Jan 2022

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Verified SHC Patient

Dr Clarke was fantastic. Knowledgeable, kind, a good listener and explainer.

Dec 2021

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Verified SHC Patient

Great Doctor

Dec 2021

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Verified SHC Patient

He's extremely knowledgeable and compassionate. I feel fortunate to be able to work with him.

Dec 2021

•

Verified SHC Patient

Dr. John Clarke is an excellent Gastroenterologist that I will not hesitate to anyone. He is professional, caring, listens and gives top nosh advice!

Dec 2021

•

Verified SHC Patient

Doctors took time to understand your concerns and provided detailed explanation

Dec 2021

•

Verified SHC Patient

Dr. Clarke is hands down one of the best doctors I've ever seen. His explanations are extremely thorough, clear, and he provides insights into relevant clinical studies. He lists alternative options and outlines pros/cons for each one. Very calm and kind! 10/10 Recommend!

Dec 2021

•

Verified SHC Patient

Great Doctor. Would like to be able to get ahold of him easier via my chart. Often, I get answers from someone on staff, not from him directly.

Dec 2021

•

Verified SHC Patient

Dr. Clarke is a very asset to Stanford. He is kind, caring, knowledgeable and goes above and beyond for his patients. My mother is very lucky to have him as her doctor and we are very blessed that he is overseeing her care.

Dec 2021

•

Verified SHC Patient

Very pleasant and easy to talk to.

Nov 2021

•

Verified SHC Patient

Dr Clarke is kind, caring and attentive

Nov 2021

•

Verified SHC Patient

Dr. Clarke and his Nurse Practitioner took the time to explain things to me. I appreciated their time in trying to help me.

Nov 2021

•

Verified SHC Patient

Dr. Clarke is very caring and does not rush you through the visit. He is easy to talk you and clearly listens to you. I trust his judgement ..

Nov 2021

•

Verified SHC Patient

Appt with Dr Clarke was excellent and I greatly appreciate his time and input. Thank you!

Nov 2021

•

Verified SHC Patient

Dr Clarke is excellent. He is compassionate and knows his stuff!

Nov 2021

•

Verified SHC Patient

Dr. Clarke is a wonderful doctor and I consider myself quite lucky and quite blessed, that I was referred to him!

Nov 2021

•

Verified SHC Patient

Dr. Clarke is very thorough.

Oct 2021

•

Verified SHC Patient

First rate - Does an excellent job!

Oct 2021

•

Verified SHC Patient

Very considerate compassionate, professional and thorough physician. Thank you.

Oct 2021

•

Verified SHC Patient

Dr. Clarke is a compassionate, caring and kind doctor, there is no other doctor I have ever had like him. He excels in the care of his patients and listens to their concerns. He is open to modalities that may help his patients and never makes us feel bad about wanting to explore them. He truly understands the mind-gut connection.

Oct 2021

•

Verified SHC Patient

Dr. Clarke was very friendly, knowledgeable, and patient. He listened attentively to what I had to say, and explained things carefully and slowly, which I REALLY appreciate. Dr. Clarke also gave me different options for approaching my health problem, followed by his advice to what he thought would be the best course of action for me. (I've had issues with other doctors who also gave me options, but asked me to choose what I wanted to do and I didn't feel I could make that choice). I also appreciate that the appointment started and ended right on time. Overall, an excellent consult.

Oct 2021

•

Verified SHC Patient

Exceptional physician Sent my entire family and all my friends to Dr Clarke

Oct 2021

•

Verified SHC Patient

He and his time are the best!!!

Oct 2021

•

Verified SHC Patient

He was patiently listening and suggesting remedies to all the concerns I had.

Oct 2021

•

Verified SHC Patient

Very caring about my welfare.

Oct 2021

•

Verified SHC Patient

Thank you!!! Seems like a Very personable Dr and u just donâ€™t find many of them anymore. I am really excited to see if Dr Clark and the Stanford team can help me with my complex issues. Seems to me as I am going in the right direction with Dr Clark.

Oct 2021

•

Verified SHC Patient

Dr. Clarke showed interest in my situation, and was very thorough in putting the big picture together from my precious history up to our visit, to properly access my next steps. Iâ€™ve been challenged with symptoms since March 2020, and felt heard and understood. He also explained my previous test results more thoroughly than I have experienced. I left the visit with hope, and a plan I understood! My thanks to Dr. Clarke.

Oct 2021

•

Verified SHC Patient

Great as always. Knows meâ€¦that explains it all.

Sep 2021

•

Verified SHC Patient

I have not met Dr. Clarke in person, only through telehealth. I have found him knowledgable about my issues and very thorough going over them. He answers all your questions in a helpful way. He is smart, warm, and kind and I feel like he is really looking out for you. I'm looking forward to meeting him in person!

Sep 2021

•

Verified SHC Patient

Dr. Clarke is very courteous, friendly and professional with no pretensions. He's also practical and realistic.

Sep 2021

•

Verified SHC Patient

He is one of my best Doctors. I know I am in great care with him!!! Listens/explains/cares ...

Sep 2021

•

Verified SHC Patient

Great attention to my case. Very satisfied.

Sep 2021

•

Verified SHC Patient

Very caring, excellent bedside manner, doing his best to help me with my illness.

Sep 2021

•

Verified SHC Patient

Dr Clarke listens and supports what I do to help myself. Encourages. Thanks.

Sep 2021

•

Verified SHC Patient

He is excellent in patient care, knowledge, and approachability. I feel fortunate to have him on my team as I have difficult issues.

Sep 2021

•

Verified SHC Patient

Dr Clarke is my favorite provider. He always makes me feel like an important part of my healthcare team. I know Iâ€™m in good hands.

Sep 2021

•

Verified SHC Patient

Dr. Clarke is an excellent physician. He is companionate, smart, and creative. He keeps up with the latest developments on GI medicines. He is a real asset to Stanford Health Care. I feel so fortunate that he is my doctor. He has changed my life for the better. I can now have a normal life thanks to his skills in recommending the correct medicine for me when other doctors were not knowledgeable enough to solve the problem. I am a huge fan!

Sep 2021

•

Verified SHC Patient

Dr. Clarke is great. He has helped me so much and is always kind and caring.

Aug 2021

•

Verified SHC Patient

Dr. John Clarke is absolutely amazing. His expertise is matched by his humility and great listening skills. Getting under his care was one of the best things that happened to me health wise.

Aug 2021

•

Verified SHC Patient

Excellent doctor for my GI issue!

Aug 2021

•

Verified SHC Patient

He explained very well the different causes and solutions to my problems

Aug 2021

•

Verified SHC Patient

He was very helpful and explained everything to me in detail. Thank you!

Aug 2021

•

Verified SHC Patient

Heâ€™s a good doctor , I feel like heâ€™s taking care of his patients even if not in person visit

Aug 2021

•

Verified SHC Patient

Dr. Clarke is an excellent Gastroenterologist!

Aug 2021

•

Verified SHC Patient

Both Dr. Clarke and Monica Nandwani were very patient and pleasant to speak with. We really enjoyed our visit with them.

Aug 2021

•

Verified SHC Patient

Dr. John Clarke had a personable tone in the setting of the video consultation, which helped my Mom (the patient) and I feel safe about discussing my Mom's health concerns and moving forward with the plan of care. Thank you Dr. Clarke.

Aug 2021

•

Verified SHC Patient

Dr. John Clarke is a wonderful, caring doctor. We would go even further just to have him as our GI doctor. He is articulate, easy to understand, thoughtful and conservative. He puts one at ease discussing issues that are sometimes hard to discuss. In other words HE IS THE BEST!

Aug 2021

•

Verified SHC Patient

I always get the best and latest medical advice for my condition here.

Aug 2021

•

Verified SHC Patient

Dr Clarke was very attentive and explained things very well. He provided helpful information and gave me good treatment options.

Aug 2021

•

Verified SHC Patient

Great video call and excellent communication. Never feel rushed.

Aug 2021

•

Verified SHC Patient

Seems very competent. I liked him very much.

Aug 2021

•

Verified SHC Patient

Excellent physician, glad he is working with residents

Jul 2021

•

Verified SHC Patient

Very kind, informative, knowledgeable and answered all my questions. Great experience!

Jul 2021

•

Verified SHC Patient

Excellent doctor. Extremely knowledgeable, caring and easy to talk to.

Jul 2021

•

Verified SHC Patient

He is an excellent doctor.

Jul 2021

•

Verified SHC Patient

He is a very caring and I felt very comfortable with him. He does patients needs first priority. I have always been happy and content with his handling different issues.

Jul 2021

•

Verified SHC Patient

Excellent

Jul 2021

•

Verified SHC Patient

Great Doctor. Genuinely concerned.

Jul 2021

•

Verified SHC Patient

Dr. Clarke was cordial and thorough.

Jun 2021

•

Verified SHC Patient

Dr Clarke is the best doctor I have ever had. Deep gratitude for all he has helped me with!

Jun 2021

•

Verified SHC Patient

Dr. Clarke is very knowledgeable and caring. I always look forward to my visits with him.

Jun 2021

•

Verified SHC Patient

Knowledgeable

Jun 2021

•

Verified SHC Patient

Great doctor, very knowledgeable.

Jun 2021

•

Verified SHC Patient

doctor had reviewed the available info from other offices and no time was wasted. a good doc

Jun 2021

•

Verified SHC Patient

. I highly recommend Dr.John Clarke. He is a great Doctor. Thanks a lot !

Jun 2021

•

Verified SHC Patient

He was very polite and great in giving me some good news.

May 2021

•

Verified SHC Patient

Excellent physician who is knowledgeable and cares.

May 2021

•

Verified SHC Patient

Excellent, very patient, explains my health concern very well, and will followup with results.

May 2021

•

Verified SHC Patient

Dr. Clark asked great questions and listened when I spoke. He explained all options and summarized my result clearly.

May 2021

•

Verified SHC Patient

Great listener, explained things clearly and answered all questions

May 2021

•

Verified SHC Patient

I found Dr. Clark to be very knowledgeable and helpful in the explanation of my condition and planning of my care. He answered all of my questions to my satisfaction and I agree with him on his planned protocol going forward

May 2021

•

Verified SHC Patient

Very thorough! Appreciate his expertise.

May 2021

•

Verified SHC Patient

Dr. Clarke is an excellent doctor. He is good at listening and explaining. He really takes my complexities into consideration when making decisions on procedures. One of the best docs.

May 2021

•

Verified SHC Patient

Dr. Clarke was excellent. Friendly, knowledgeable and reassuring. Thank you

May 2021

•

Verified SHC Patient

My visit with Dr Clarke was wonderful as usual. He is very thorough and allows me to be part of my healthcare decisions. He gives me hope when Iâ€™m dealing with my serious GI issues. He is open minded and Iâ€™m so grateful he is my doctor.

May 2021

•

Verified SHC Patient

I previously described Dr. Clarke's expertise, professionalism, knowledge, approach to analyzing the options and genuine sense of interest in resolving the issues in my previous comments section. The only other thing I would add is he generates warmth and caring.

May 2021

•

Verified SHC Patient

Prefer his style of presenting options which are well explained.

May 2021

•

Verified SHC Patient

Wonderfully informed and thoughtful!

Apr 2021

•

Verified SHC Patient

Appreciated Dr. Clarkeâ€™s attention and helpful suggestions during the video visit. Also, was able to arrange follow up video visit and in clinic visit.

Apr 2021

•

Verified SHC Patient

Dr. Clarke had a plan for my illness and was very positive about the outcome, which made me feel better.

Apr 2021

•

Verified SHC Patient

I am so grateful to have Dr. Clarke on my "Care Team". Dr. Clarke is very kind, open-minded, knowledgeable, understanding and respectful. Dr. Clarke is very supportive of a patient's decision to explore non-invasive treatments within reason.

Apr 2021

•

Verified SHC Patient

Dr Clark is a doctor I feel is honest and takes his time to listen he doesnâ€™t make me feel that he is in a hurry I am very comfortable with him and Iâ€™m happy that he helped me after years of not knowing what was wrong with me thank you so much

Apr 2021

•

Verified SHC Patient

Thanks for providing me with the "current" info for those areas discussed. Always appreciate your openness to my use of added health resources to develop a plan to live will with my chronic digestive issues.

Apr 2021

•

Verified SHC Patient

Has resolved the issues that directed me to him in the referral.

Apr 2021

•

Verified SHC Patient

Wonderful and personable. A great physician and very knowledgeable.

Apr 2021

•

Verified SHC Patient

After 2 years, Dr. Clarke has yet to figure out what's wrong with me.

Jan 2021

•

Verified SHC Patient

Dr. John Clarke is amazingly good - Both in "bedside manner" and understanding the medical issues and explaining them in an honest manner to the patient.

Aug 2020

•

Verified SHC Patient

The best doctor ever!

Aug 2020

•

Verified SHC Patient

Dr. Clarke is an excellent care giver, very professional and caring.\

Feb 2020

•

Verified SHC Patient

amazing care, awesome Doctor. things are always explained in a way I can understand. any questions or concerns I have are always addressed.

Feb 2020

•

Verified SHC Patient

Dr. Clarke is the best doctor that performed my colonoscopy procedure.

Jan 2020

•

Verified SHC Patient

Genuinely concerned included me in decisions about my care. was not rushed

Jan 2020

•

Verified SHC Patient

Best doctor ever! Friendly, listens explains any concerns. Have total trust in Dr. Clarke. Only wish there were more doctors like him.

Jan 2020

•

Verified SHC Patient

was impressed with Dr. Clark

Dec 2019

•

Verified SHC Patient

Dr. Clarke is fantastic and has been an exemplary example of the professionalism and world-class level of care provided by Stanford.

Dec 2019

•

Verified SHC Patient

It was a pleasure to talk with a physician who is not only kind and considerate, but who clearly knows your situation and how best to deal with it.

Dec 2019

•

Verified SHC Patient

Dr. Clark does an excellent job. Explains everything clearly -

Dec 2019

•

Verified SHC Patient

Dr. Clarke is a very kind, caring and compassionate doctor. He is extremely knowledgeable in Motility and Scleroderma GI involvement which is mandatory for a patient such as myself. I feel very confident in his treatments and advice.

Nov 2019

•

Verified SHC Patient

Dr. Clark "ROCKS." Dr. Clark - 1:1 meeting.

Nov 2019

•

Verified SHC Patient

Dr. Clarke is always very attentive and puts you at ease.

Nov 2019

•

Verified SHC Patient

I'm not really one of those people who marks very good for everything, but this just so happens to be the truth. This provider speaks to you as an equal, with thorough amount of in-depth information so you can make good decisions for yourself about your care. Really the best provider I have ever seen for any issue or trouble.

Oct 2019

•

Verified SHC Patient

Dr. Clark is an amazing, caring, and knowledgeable doctor.

Oct 2019

•

Verified SHC Patient

Dr. Clarke is amazing! I've been very ill for a long time and for the first time I've been given hope. He is very knowledgeable, caring, and thorough. I have not been this impressed with a care provider before. I am grateful to be under his care.

Sep 2019

•

Verified SHC Patient

Dr. Clarke performed his duties above and beyond. I have utmost confident in his medical abilities.

Sep 2019

•

Verified SHC Patient

Excellent providers. Did a wonderful job in answering all my questions.

Aug 2019

•

Verified SHC Patient

Dr. Clarke is an exceptionally great specialist. He is also a great human being with understanding compassion and patience.

Aug 2019

•

Verified SHC Patient

Dr. Clarke was extremely knowledgeable about my symptoms and conditions. He put me at ease with treatment options and further care. He was not in any rush and I appreciated the time and thoroughness he gave me.

Aug 2019

•

Verified SHC Patient

Although he was running quite late due to the crisis, he did not make us feel hurried and answered all questions asked of him.

Jul 2019

•

Verified SHC Patient

Dr Clarke is the best all around!

Jul 2019

•

Verified SHC Patient

Excellent

Jun 2019

•

Verified SHC Patient

shared with neighbors ,friends and family what a good experience we had . Neighbor has already called and schedule a visit with the provider.

Jun 2019

•

Verified SHC Patient

Dr. Clarke is an excellent physician.

May 2019

•

Verified SHC Patient

MD and resident & intern were great. Stanford itself, though, always leaves much to be desired where support staff and such are concerned.

May 2019

•

Verified SHC Patient

Dr. Clarke is wonderful. Kind and considerate of my issues and general health! He is reassuring and gives me hope.

Apr 2019

•

Verified SHC Patient

As much as the dr. as his personnel are very nice and humanitarian.

Apr 2019

•

Verified SHC Patient

I was pleased with the care I received. The doctor answered all questions and addressed my concerns. He was patient and did not make me feel rushed. I appreciated the amount of time he dedicated to my appointment.

Mar 2019

•

Verified SHC Patient

Even as we were late he spent time with us as needed.

Mar 2019

•

Verified SHC Patient

Clarke and his PAs have been great. We are working through a plan and he's been supportive of my desire and needs. I've already recommended him to others.

Mar 2019

•

Verified SHC Patient

Good.

Mar 2019

•

Verified SHC Patient

Dr. Clarke was very professional & informative.

Mar 2019

•

Verified SHC Patient

Dr. Clarke is a very patient doctor.

Mar 2019

•

Verified SHC Patient

I know that my mother is in very good hands with Dr. Clarke. He takes the time to listen to her. He asks for her opinion about other care options and is very empathetic and concerned for her health. Her health is what it is but is really helps her to deal with her issues knowing that Dr. Clarke continues to try and provide relief. He also advises of new and upcoming medications that may assist her. We are very grateful to Dr. Clarke for his care of my mother.

Jan 2019

•

Verified SHC Patient

Best GI doc I've seen.

Jan 2019

•

Verified SHC Patient

The doctor did NOT review my history (medical records) and I had to start again - Very unproductive.

Dec 2018

•

Verified SHC Patient

Dr.John Clarke is very personable, helpful and knowledgeable. I am getting to know him more and as of now, I feel comfortble with his approaches.

Dec 2018

•

Verified SHC Patient

This is when it gets GOOD!! Dr. Clarke is amazing, kind and spends a lot of time!! Dr. Alexander Podbody is amazing. He has qualities that will make him a successful doctor!!!! Both have great "beside manner."

Dec 2018

•

Verified SHC Patient

The problem is a plan is created and then never executed. Also there have been a few times I have messaged using the online portal and no one responds.

Dec 2018

•

Verified SHC Patient

I've never spent so much time with a gastroenterologist. Dr. Clark didn't seem to be in a rush (a common experience I've had in the past), and used the information from my esophagus biopsy (done in 2017) to inform me of another illness that I didn't know I had and that was causing a lot of my symptoms. This information and his advice have already made a difference.

Nov 2018

•

Verified SHC Patient

Dr Clarke has always had a listening ear and provides a great bedside manner. his knowledge is vast, but he's also willing to admit when things are difficult. he's a wonderful doctor!

Oct 2018

•

Verified SHC Patient

Dr. Brian-Clark is fantastic, one of the finest physicians I have ever dealt with. Thank you!

Oct 2018

•

Verified SHC Patient

Dr. Clarke is a excellent doctor. He is caring and helpful.

Oct 2018

•

Verified SHC Patient

Excellent.

Oct 2018

•

Verified SHC Patient

I had a wonderful experience with him. He was very friendly and understanding and accommodating to my needs.

Oct 2018

•

Verified SHC Patient

Dr. Clarke is patient, friendly, knowledgable and professional. THANK YOU so much Dr. Clarke.

Oct 2018

•

Verified SHC Patient

This is my first visit... overall experience with doctor was good. follow ups and scheduling is pathetic with his staff.

Oct 2018

•

Verified SHC Patient

Dr. Clarke epitomizes what an outstanding GI Doctor ought to be. Please keep him happy so he'll stay put.

Oct 2018

•

Verified SHC Patient

The care providers were very patient

Sep 2018

•

Verified SHC Patient

Good.

Sep 2018

•

Verified SHC Patient

Dr. Clarke gave me excellent care, took the time to walk me through my questions.

Aug 2018

•

Verified SHC Patient

Dr. Clarke and his associate doctor really listened to all my concerns. Both doctors took their time and never rushed me. It was an extremely positive first experience.

Aug 2018

•

Verified SHC Patient

excellent

Jul 2018

•

Verified SHC Patient

Doctor Clarke was very kind I liked him. Most doctors I deal with are arrogant he was not.

Jul 2018

•

Verified SHC Patient

Excellent provider

Jun 2018

•

Verified SHC Patient

Based on similar Drs I have visited in the immediate area Dr Clarke is hands down the most courteous and professional Dr I have found.

May 2018

•

Verified SHC Patient

Very good!

Apr 2018

•

Verified SHC Patient

Dr. J. O. Clarke was very understanding and answered all my questions. He offered solutions that made sense and overall I felt confident that I will get better.

Feb 2018

•

Verified SHC Patient

Dr. Clarke was wonderful and made me feel very comfortable.

Jan 2018

•

Verified SHC Patient

These comments refer to Dr. Clarke. I was somewhat concerned that he thought my connective tissue disorder (EDS) didn't apply to internal organs, muscles and viscera--only to skin and joints. I was pleased that he took note with my concern and correction of this perception. Overall, Dr. Clarke was a very kind and knowledgable and a good listener. I wasn't expecting him to suggest P.O.E.M. and had prepped my questions for dilatation, and so afterwards, thought of questions about P.O.E.M. I should have asked...

Jan 2018

•

Verified SHC Patient

Excellent service from Dr. John.

Jan 2018

•

Verified SHC Patient

Both NP and doctor were very informative and helpful. Great bedside manner!

Dec 2017

•

Verified SHC Patient

Dr. Clarke is a very good & caring doctor.

Dec 2017

•

Verified SHC Patient

I would recommend my care provider to my family, friends or anyone that I meet.

Dec 2017

•

Verified SHC Patient

Dr. Clarke is very personable responsive to my needs and issues good listener and extremely well organized with a PLAN at follow up after endo/colo.

Nov 2017

•

Verified SHC Patient

Dr. Clarke is excellent. Very knowledgeable yet humble. He listens very carefully to his patients. Best GI dr. I had every have.

Oct 2017

•

Verified SHC Patient

Dr. Clarke seemed to care.

Sep 2017

•

Verified SHC Patient

I have already recommended Dr. Clarke to others.

Sep 2017

•

Verified SHC Patient

Dr. Clarke is the best.

Aug 2017

•

Verified SHC Patient

Again really liked Dr. John Clarke. He's a caring and thoughtful Doctor!

Jul 2017

•

Verified SHC Patient

He communicates his expertise in a way I understand and lets me know his reasoning for his decisions.

Jun 2017

•

Verified SHC Patient

Dr. Clarke is and patient. My health issues are unusual and complicated and I have really appreciated his persistence in trying to get to the bottom of the problem even though several tests have not yielded any easy answers.

Jun 2017

•

Verified SHC Patient

O'Brien is the best GI Doc I've ever seen; and I've seen many. He's smart, keeps up on latest research, friendly, and takes the time to brainstorm options with me.

May 2017

•

Verified SHC Patient

This was my first time seeing this dr. He explained things very well.

May 2017

•

Verified SHC Patient

Has better insights than other G.I. dr.'s I have seen.

Mar 2017

•

Verified SHC Patient

A most reassuring experience.

Mar 2017

•

Verified SHC Patient

I find it very easy and pleasant to discuss my care with Dr. Clarke. I have great confidence in him.

Mar 2017

•

Verified SHC Patient

Very caring and thoughtful.

Mar 2017

•

Verified SHC Patient

Easily the best doctor I have seen. Very precise, helpful. Wish there were more such doctors. When the doctor is confident, the patient feels confident. Dr. Clarke takes the time to answer questions. I trust him.

Feb 2017

•

Verified SHC Patient

So thankful to have Dr. Clarke caring for me.

Feb 2017

•

Verified SHC Patient

I was very impressed that he did some research/reading about my issues prior to coming in to the room and then told me about what he had learned. Taking that extra step/time did not go unnoticed

Feb 2017

•

Verified SHC Patient

Dr. Clarke is amazing! He is very thorough and open to my questions and requests. I have seen several Gastroenterologists and he has been the one to give me the most hope.

Feb 2017

•

Verified SHC Patient

Dr. Clarke is awesome.

Jan 2017

•

Verified SHC Patient

Dr. O'Brien reviewed my medications and determined that some were those he would prescribe, but possibly in different doses. We agreed that if my symptoms increased again, I would contact him.

Jan 2017

•

Verified SHC Patient

Dr. Cooke is a caring, patient, supportive doctor.

Jan 2017

•

Verified SHC Patient

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John Clarke

Gastroenterologist, Motility specialist

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Biography

Professional Summary

Professional Education

Honors & Awards

Administrative Appointments

Publications

Clinical Trials

Specializing In

Practice Locations

Digestive Health Center in Redwood City Redwood City, CA

Digestive Health Center in Redwood City

Esophagus Center Redwood City, CA

Esophagus Center

Amyloid Center Stanford, CA

Amyloid Center

General Endoscopy Redwood City, CA

General Endoscopy

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Patient Ratings

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Patient Reviews

(325 reviews)

Referring Physicians

PHYSICIAN HELPLINE

New to MyHealth?

ALREADY HAVE AN ACCESS CODE?

DON'T HAVE AN ACCESS CODE?

NEED MORE DETAILS?

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WELCOME BACK

John Clarke

Gastroenterologist, Motility specialist

Get In Touch

Biography

Professional Summary

Professional Education

Honors & Awards

Administrative Appointments

Publications

Clinical Trials

Specializing In

Practice Locations

Digestive Health Center in Redwood City Redwood City, CA

Digestive Health Center in Redwood City

Esophagus Center Redwood City, CA

Esophagus Center

Amyloid Center Stanford, CA

Amyloid Center

General Endoscopy Redwood City, CA

General Endoscopy

Important Information about Our Organizations and Physician Affiliation

Patient Ratings

How Our Ratings Work

Patient Reviews

(325 reviews)

Referring Physicians

PHYSICIAN HELPLINE