Test library
HBsAg Test
A blood test that detects the hepatitis B surface antigen, an early marker of infection and a key indicator of acute or chronic hepatitis B.
Order Hepatitis B Surface Antigen Lab Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Hepatitis B Surface Antigen Lab Test- Typical turnaround
- 1-3 business days
- Starting price
- From $24
- Results
- Confidential, online
Quick answer
This test looks for the hepatitis B surface antigen in a blood sample. HBsAg is one of the earliest markers to appear after infection and is used to help identify acute or chronic hepatitis B. A healthcare provider interprets the result with other markers and the clinical picture.
What this test measures
The hepatitis B surface antigen is a protein on the outer coat of the virus. Its presence generally indicates that the virus is in the blood and can be an early sign of infection. If HBsAg remains detectable over time, a clinician may evaluate for chronic hepatitis B.
A routine blood draw provides the serum for analysis. The laboratory reports HBsAg, and results are often combined with anti-HBs, anti-HBc total, anti-HBc IgM, HBeAg, anti-HBe, and HBV DNA. Together, these markers describe the stage of infection and whether the immune system has responded.
Testing is commonly requested after possible exposure, during screening programs, in pregnancy care, or when liver symptoms need evaluation. The result does not stand alone; a qualified healthcare provider determines what the pattern of markers means for diagnosis and follow-up.
- HBsAg (hepatitis B surface antigen)
- HBsAg confirmatory neutralization test
- Anti-HBs (hepatitis B surface antibody)
- Anti-HBc total antibodies
- Anti-HBc IgM antibodies
- HBeAg and anti-HBe markers
- HBV DNA by molecular testing
- ALT (liver enzyme context)
Why people order this test
- Screen for hepatitis B infection
- Evaluate a possible exposure to the virus
- Assess liver-related symptoms or abnormal enzymes
- Support prenatal or pre-procedure testing requirements
- Follow the course of a known hepatitis B infection
How to prepare
No fasting is required, and collection can occur at any time of day. A standard venous blood sample is drawn at a laboratory. Follow the collection instructions provided by the laboratory.
Understanding your results
Results are typically available within one to three business days. A positive HBsAg suggests the virus is present, and a healthcare provider uses additional markers to distinguish acute from chronic infection.
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Frequently Asked Questions
What does a positive HBsAg mean?
It indicates the surface antigen was detected in the blood, which can occur with acute or chronic infection; a healthcare provider interprets the full marker pattern.
Can HBsAg be positive after vaccination?
No. Vaccination produces surface antibodies rather than the surface antigen, so a positive HBsAg is not caused by the vaccine.
Is a confirmatory test needed?
Some laboratories perform a neutralization step to confirm a reactive screening result, which improves accuracy.
Do I need to fast?
No fasting is required for this test.
What sample is required?
A standard venous blood sample collected at a laboratory.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.