Before the Computed Tomography (CT) Scan

Before the Procedure

• Your doctor will explain the chest CT procedure to you and offer you the opportunity to ask any questions that you might have. 

• If your procedure involves the use of contrast dye, you may be asked to sign a consent form that gives permission to do the procedure. Read the form carefully and ask questions if something is not clear. 

• Notify the technologist if you have ever had a reaction to any contrast dye, or if you are allergic to iodine or seafood.
  
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Generally, there is no fasting requirement prior to a CT scan, unless a contrast dye is to be used. Your doctor will give you special instructions ahead of time if contrast is to be used and if you will need to withhold food and drink. 

• Notify the technologist if you are pregnant or suspect you may be pregnant. 

• Notify the technologist if you have any body piercing on your chest and/or abdomen. 

• Dress in clothes that permit access to the area or that are easily removed. 

• Based upon your medical condition, your physician may request other specific preparation.
  

Eating

Do not eat for 2.5 hours prior to the examination. You may have clear liquids up to two hours before the examination. Clear liquids include water, black coffee or tea, apple juice, clear soda, or clear broth. You may take your medication at your normal time with water. Follow any other special instructions from your caregiver.

Clothing and jewelry

Do not wear any jewelry including rings, earrings, necklaces, or watches. Wear comfortable clothing without metal zippers or snaps. Remove anything that might interfere with the CT scan pictures such as eyeglasses, dentures, or hairpins. You may also be asked to remove hearing aids and removable dental work.

Creatinine blood test

This is required within 30 days prior to the CT examination for the following people:

• Patients who are age 70 years or older;
• Patients who are diabetic (insulin and non-insulin dependent types);
• Patients who have a history of renal insufficiency/renal masses/single kidney.

If you have this test done at an outside facility, it is your responsibility to obtain a copy of the result and bring it to the appointment with you.

Learn more about blood tests.