If a patient tests positive for anti-HAV and IgG, what is the appropriate interpretation?

If a patient tests positive for anti-HAV and IgG, what is the appropriate interpretation?

• A. The patient has recovered from a previous Hepatitis A infection and is now immune.
• B. The patient currently has an active Hepatitis A infection.
• C. The patient is in the preicteric phase of viral hepatitis.
• D. The patient is in the icteric phase of viral hepatitis.

Answer: (B)

The key idea is that HAV IgG marks immunity, not active infection. When a patient has anti-HAV IgG present (and no IgM detected), it means they have immunity from a prior Hepatitis A infection or from vaccination. This pattern shows protection going forward, not current viral activity. In contrast, acute or active Hepatitis A infection is indicated by anti-HAV IgM appearing in the serum, often with symptoms and liver-test abnormalities. The preicteric and icteric phases describe stages of an active hepatitis illness, which would align with IgM positivity rather than IgG alone. So, a positive HAV IgG antibody signifies immune status—the patient has recovered or was vaccinated and is not currently infectious.

The key idea is that HAV IgG marks immunity, not active infection. When a patient has anti-HAV IgG present (and no IgM detected), it means they have immunity from a prior Hepatitis A infection or from vaccination. This pattern shows protection going forward, not current viral activity.

In contrast, acute or active Hepatitis A infection is indicated by anti-HAV IgM appearing in the serum, often with symptoms and liver-test abnormalities. The preicteric and icteric phases describe stages of an active hepatitis illness, which would align with IgM positivity rather than IgG alone.

So, a positive HAV IgG antibody signifies immune status—the patient has recovered or was vaccinated and is not currently infectious.