Understanding Lab Tests for Past Hepatitis A infection
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Past Hepatitis A infection refers to a previous exposure to the Hepatitis A virus (HAV) that has since resolved. While the acute infection may have occurred months or years ago, the body's immune system retains a memory of this encounter through specific antibodies that remain in the bloodstream.
Recommended Test
Hepatitis A Antibody, Total
This test detects the total antibodies produced by the immune system in response to Hepatitis A virus exposure. The presence of these antibodies, even at lower levels, indicates a past infection with Hepatitis A. These antibodies remain in the system long after the infection has cleared, providing evidence of previous exposure and typically conferring lifelong immunity.
2907 reviews
Detecting Past Hepatitis A Infection
Unlike an active infection, a past Hepatitis A infection cannot be diagnosed through physical examination or symptoms, as the infection has already cleared. Blood testing is the only reliable method to confirm previous exposure to the virus and determine immunity status.
Why Test for Past Hepatitis A Infection
Testing for past Hepatitis A infection is important for several reasons: it confirms natural immunity, helps determine vaccination needs, and provides valuable information for travel health planning or occupational health requirements.
Understanding Your Results
A positive result for Hepatitis A total antibodies indicates that you have been exposed to the virus in the past and have developed immunity. This immunity typically provides lifelong protection against future Hepatitis A infections. Your healthcare provider can help interpret your specific results and advise on any necessary follow-up actions.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment recommendations.
