For viral hepatitis, the primary index to check is liver function. If there are obvious abnormalities in liver function, further clarification is needed to determine what caused these liver function abnormalities. The most common pathogens include Hepatitis A, B, C, E, D, and non-A non-E, etc. Typical hospitals carry out tests for Hepatitis A, B, C, and E. Hepatitis A and E are acute hepatitis; if IgM antibodies are positive, it can indicate a recent infection. However, if IgG antibodies are positive, their significance is not very substantial. If Hepatitis B or C causes the liver damage, further tests such as HBV-DNA, HCV-RNA, etc., need to be conducted to clarify the cause of the liver condition. Additionally, regular follow-up exams like ultrasound and AFP are required.