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Blood Test Guide

Hepatitis B Blood Tests

Hepatitis B has several blood tests that show whether you are infected, immune from vaccination, or susceptible. Here's a plain-English guide to every hepatitis B marker.

Written and clinically reviewed by Suman Konda, PharmD, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: · How we check our content

Hepatitis B markers explained

MarkerWhat it means when POSITIVE
HBsAg (surface antigen)Active hepatitis B infection (acute or chronic)
HBsAb / anti-HBs (surface antibody)Immune: from vaccination or past infection
HBcAb / anti-HBc IgM (core antibody IgM)Recent / acute hepatitis B infection
HBcAb / anti-HBc IgG (core antibody IgG)Past infection (recovered) or current infection
HBeAg (e antigen)High viral replication: highly infectious
HBeAb / anti-HBe (e antibody)Lower viral activity (seroconversion: good sign)
HBV DNA (viral load)Amount of virus: guides treatment decisions

Interpreting hepatitis B result patterns

Common result combinations

HBsAg negative, HBsAb positive: Immune, from vaccination or past cleared infection. No action needed. | HBsAg positive, HBeAg positive, high HBV DNA: Active replication, highly infectious, needs treatment consideration. | HBsAg positive, HBeAb positive, low HBV DNA: Inactive carrier state, lower infectivity, regular monitoring. | All negative: Susceptible, no immunity. Vaccination recommended.

Who should be tested for hepatitis B?

  • People born in regions with high HBV prevalence (Asia, Africa, Eastern Europe)
  • Household contacts or sexual partners of HBsAg-positive people
  • People with multiple sexual partners
  • Healthcare workers
  • People with HIV or hepatitis C
  • Pregnant women (all should be screened)

Questions to ask your doctor

  • Am I infected, immune, or susceptible?
  • Do I need the hepatitis B vaccine?
  • If I have chronic HBV, do I need antiviral treatment?
  • Do I need regular liver ultrasound and AFP for liver cancer surveillance?

Frequently Asked Questions

What do the different hepatitis B tests mean?
The panel distinguishes infection from immunity: surface antigen (HBsAg) indicates current infection, surface antibody (anti-HBs) indicates immunity, and core antibody (anti-HBc) indicates past or present exposure.
Can hepatitis B be prevented?
Yes. A safe, effective vaccine provides long-lasting protection and is part of routine immunisation in many countries. Post-exposure treatment is also available after significant exposure.
Does a positive test mean lifelong infection?
Not always. Many adults clear acute hepatitis B and develop immunity. A minority develop chronic infection, which is monitored and, when needed, treated to protect the liver.

References

The clinical information on this page is drawn from peer-reviewed sources indexed by the US National Library of Medicine. Links go to the source so you can read it yourself.

  1. Hepatitis B. In: StatPearls. Treasure Island (FL): StatPearls Publishing. NCBI Bookshelf NBK555945

Related reading

Medical Disclaimer: For educational purposes only. Always consult a qualified healthcare professional for diagnosis and treatment.