Hepatitis B Surface Antigen (HBsAg) details
What Hepatitis B Surface Antigen (HBsAg) shows
Hepatitis B surface antigen is a protein found on the outer coat of the hepatitis B virus itself, and its presence in your blood directly indicates an active, current hepatitis B infection — whether acute (recent) or chronic (long-term, lasting more than six months). It's the primary screening test for hepatitis B infection, and a positive result prompts further testing (including core antibody IgM to check if it's a new infection, and viral load testing) to characterize the infection and guide whether treatment or monitoring is needed.
Tests that include Hepatitis B Surface Antigen (HBsAg)
This test detects the Hepatitis B surface antigen. HBsAg is used to identify the presence of acute infection. It can serve as an indicator of chronic infection when it is present for more than six months.
- Hepatitis B Surface Antigen (HBsAg) A protein on the surface of the hepatitis B virus — its presence indicates an active, current hepatitis B infection.
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