hbsag
STIBlood sampleResults 24 hrsNo fasting
HBsAg
A blood test that checks for active Hepatitis B infection by detecting the virus's surface antigen. A key part of routine health and sexual-health screening.
Sample
Blood
Results
24 hrs
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Hepatitis B surface antigen (HBsAg)
ECLIA · serum
Qualitative · Reactive/Non-reactive
When to get this test
Routine screening
Recommended for general health checks, pregnancy, and pre-employment requirements.
Sexual-health screening
Hepatitis B can be transmitted sexually, so it is part of a complete STI check.
Known exposure
Helpful if you may have been exposed to Hepatitis B or have a partner who is positive.
How to prepare
01
No special preparation needed.
Common questions
What does a reactive result mean?
A reactive result suggests active Hepatitis B infection and usually leads to further testing to learn more.
Is Hepatitis B preventable?
Yes. A safe and effective vaccine is available, which is why screening and prevention go hand in hand.
Is my result confidential?
Yes. Your results are private and shared only with you.