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Interpret Your Hepatitis B Surface Antibody Results

Enter your Anti-HBs value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.

Medical Disclaimer

This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.

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Hepatitis B Surface Antibody Normal Ranges

Anti-HBs (Hepatitis B Surface Antibody) indicates immunity to Hepatitis B — either from successful vaccination or from natural recovery after infection.

Reference RangeUnitNotes
10 – 999IU/LProtective ≥10 IU/L

Also reported in: mIU/mL.

Common Causes of High Anti-HBs

Successful Hepatitis B vaccination (most common)Natural recovery from acute Hepatitis B infection (Anti-HBs develops alongside Anti-HBc)

Common Causes of Low Anti-HBs

Non-response to HBV vaccine (<10 IU/L) — occurs in ~5–10% of healthy adultsWaning immunity years after vaccination (levels decline over time)Immunosuppression reducing vaccine response (HIV, renal failure, chemotherapy)

Want the full clinical guide to Hepatitis B Surface Antibody?

Reference ranges, causes, symptoms, preparation, and FAQs.

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Related Tests

Hepatitis B Surface Antigen

HBsAg