Notice: Users may be experiencing issues with displaying some pages on stanfordhealthcare.org. We are working closely with our technical teams to resolve the issue as quickly as possible. Thank you for your patience.
 

Learn about the flu shot, COVID-19 vaccine, and our masking policy »

Stanford Health Care

Higher C6 enzyme immunoassay index values correlate with a diagnosis of noncutaneous Lyme disease. Diagnostic microbiology and infectious disease Nigrovic, L. E., Lipsett, S. C., Molins, C. R., Wormser, G. P., Bennett, J. E., Garro, A. C., Levas, M. N., Balamuth, F., Neville, D., Lingampalli, N., Robinson, W. H., Branda, J. A. 2018

Abstract

The correlation between the Food and Drug Administration-cleared C6 enzyme immunoassay (EIA) C6 index values and a diagnosis of Lyme disease has not been examined. We used pooled patient-level data from 5 studies of adults and children with Lyme disease and control subjects who were tested with the C6 EIA. We constructed a receiver operating characteristic curve using regression clustered by study and measured the area under the curve (AUC) to examine the accuracy of the C6 index values in differentiating between patients with noncutaneous Lyme disease and control subjects. In the 4821 included patients, the C6 index value had excellent ability to distinguish between patients with noncutaneous Lyme disease and control subjects [AUC 0.99; 95% confidence interval (CI) 0.99-1.00]. An index value cut point of =3.0 had a sensitivity of 90.9% (95% CI, 87.8-93.3) and specificity of 99.0% (95% CI, 98.6-99.2%) for Lyme disease.

View details for DOI 10.1016/j.diagmicrobio.2018.12.001

View details for PubMedID 30642722