Description
The Hepatitis B Surface Antibody Blood Test measures antibodies against the surface antigen (HBsAg) of the Hepatitis B virus (HBV). These antibodies indicate immunity to Hepatitis B, either from past infection or successful vaccination.
Purpose of the Test
- Determine if a person is immune to Hepatitis B
- Evaluate the effectiveness of Hepatitis B vaccination
- Identify individuals who require vaccination or booster doses
- Screen healthcare workers, blood donors, or at-risk populations
What the Test Measures
- Anti-HBs antibodies: The presence of these antibodies shows that the immune system has successfully responded to Hepatitis B exposure or vaccination.
- Positive result: Indicates immunity
- Negative result: Suggests susceptibility to infection
Why the Test is Important
- Confirms protection against Hepatitis B, preventing unnecessary vaccination
- Helps healthcare providers monitor vaccine response in immunocompromised individuals
- Guides public health decisions regarding Hepatitis B prevention
When to Order
Individuals may need this test if they:
- Completed a Hepatitis B vaccination series and need confirmation of immunity
- Are at high risk of exposure to Hepatitis B (healthcare workers, travelers, sexually active adults)
- Have had a past Hepatitis B infection and need evaluation of ongoing immunity
- Are pregnant, to help guide maternal and neonatal care
Fasting not required.
