Could having a flu or cold when your blood is drawn cause a false positive on a Hepatitis A IgM test? Igg was negative.
Very possibly. As you know, the hepatitis A IgM antibody tests for recent infection. False positives may result due to the presence of cross-reactive antibodies from other viral infection or underlying illnesses. Depending on the circumstances and time of exposure, retesting should be considered. Best wishes:)
False positive. This is very unlikely. If you have antibodies to Hep A they are likely to be very specific for that virus.