Hepatitis B Surface Antigen
- Immune regulation
- Liver
Learn what Hepatitis B Surface Antigen measures and how it fits into your health data.
What is Hepatitis B Surface Antigen?
Hepatitis B Surface Antigen (HBsAg) is a protein on the surface of the hepatitis B virus. Detection of HBsAg indicates active hepatitis B infection (either acute or chronic). A negative result indicates no current HBV infection. Positive results are typically confirmed with additional testing. HBsAg usually appears in the serum after an incubation period of 1 to 6 months following exposure.
Testing options
Frequently ordered with:
Panels with this test:
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