HBsAg (hepatitis B surface antigen) is the main screening test for a current hepatitis B infection. A fuller panel shows whether you are infected, immune or a carrier.
| Measure | Range |
|---|---|
| HBsAg | Positive = current infection |
| Anti-HBs | Positive = immunity (vaccine or past infection) |
| Anti-HBc | Marks past or present exposure |
It means you currently have hepatitis B. Follow-up tests (viral load, e-antigen, liver function) show how active it is and whether treatment is needed, and precautions prevent spreading it.
No — anti-HBs indicates immunity, usually from vaccination or a cleared past infection. It is the protective antibody, not a sign of current infection.
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