Hepatitis B Surface Antigen: What a Positive Result Means
Of the several hepatitis B tests available, the surface antigen test answers a very specific and important question: is the hepatitis B virus currently active in your blood?
A positive result means the virus is present. Depending on how long it’s been there, that could mean a recent infection your body may still clear on its own, or a chronic infection that needs ongoing medical management — a doctor typically follows up with additional testing to tell the two apart.
Why people order this test on its own
- After a specific known or possible exposure
- A required screening for certain jobs or immigration processes
- Following up on a prior positive family member’s diagnosis
If you want a fuller picture — including whether you’re immune from a past vaccine — our Hepatitis B Panel bundles this test with two others for a more complete answer in one visit.
What to expect
No fasting needed.
Ready to order? The Hepatitis B Surface Antigen is $29 at SelectATest, with results in your own secure online portal.
This post is for general information and does not replace advice from your own doctor. Tests are ordered by an independent licensed physician, and results are not a diagnosis. If you are having a medical emergency, call 911.