HBsAg (Hepatitis B): normal range and what it means
Screens for active hepatitis B infection (qualitative — negative is normal).
Normal range
Adult reference range.
- Non-reactive< 1 index
- Reactive≥ 1 index
What it measures
A surface protein of the hepatitis B virus. A positive result means active infection, either recent or long-standing, rather than past exposure or vaccination.
What moves it
A hepatitis B infection marker, not a lifestyle-driven number. A positive result needs confirmatory testing and a doctor.
How to bring it into range
A positive result needs proper medical follow-up. Vaccination prevents infection and does not cause a positive result on this test.
How fast it responds
Reflects infection status, not lifestyle.
Also reported as: hepatitis b surface antigen · hbsag
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Common questions
- What is a normal HBsAg (Hepatitis B) level?
- Non-reactive: < 1 index. Adult reference range.
- What does a high HBsAg (Hepatitis B) mean?
- A value above the reference band means HBsAg (Hepatitis B) is outside the range typical for a healthy adult. A single reading is rarely conclusive on its own — what matters is the trend across draws and the other markers around it, which is why HealthOS reads the whole panel together rather than one number at a time.
- How do I improve my HBsAg (Hepatitis B)?
- A positive result needs proper medical follow-up. Vaccination prevents infection and does not cause a positive result on this test.
More in Immunity & Other
Reference ranges are general-population guidance compiled from common clinical laboratories, not a diagnosis. Lab-to-lab ranges differ. Always read your results with your doctor.