Blood tests can be done to confirm that there is a hepatitis, and its severity, and these tests can even give some clues as to whether the cause is viral.
Specific straightforward blood tests are required to diagnose hepatitis A:
- Hepatitis A IgM antibody - if positive indicates current or recent infection, and/or
- Hepatitis A IgG antibody - in the absence of hepatitis A IgM antibody, indicates past infection with Hepatitis A and immunity.