Quick Facts
- Sample: Blood
- Fasting: No special preparation required (avoid biotin supplements for 24 hours before testing)
- Turnaround: 2-3 days (may take longer based on weather, holiday, or lab delays)
What This Test Measures
This test quantitatively measures Hepatitis B Surface Antibody (HBsAb, also known as Anti-HBs) in a blood sample. HBsAb is the antibody your body produces after either exposure to the Hepatitis B virus (HBV) or successful HBV vaccination. The result is reported as a quantitative value, allowing your healthcare provider to assess the level of antibody present rather than only a positive or negative status.
The presence of HBsAb indicates prior exposure to HBV or vaccination, and it is generally understood to help protect against future HBV infection. This test does not distinguish between antibodies acquired through past infection and those acquired through vaccination, and it does not confirm whether HBV is currently active in the body.
Benefits
- Measures your quantitative level of Hepatitis B Surface Antibody
- Helps determine if you have developed immunity to Hepatitis B
- Useful for checking antibody response after vaccination
- Helps identify whether additional vaccination may be needed
- Convenient blood test with no special fasting required
Who Is This Test For?
- Individuals who want to check their immunity status to Hepatitis B
- Individuals who have completed the Hepatitis B vaccination series
- Individuals considering whether they need Hepatitis B vaccination
- Individuals who want to confirm antibody levels for personal records
- Individuals advised by a healthcare provider to check HBV antibody status
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures the level of Hepatitis B Surface Antibody (HBsAb) in your blood. It helps a healthcare provider evaluate whether you have developed antibodies from past exposure to Hepatitis B or from vaccination. This test alone does not diagnose an active Hepatitis B infection.
2. Who would benefit from this test?
This test may benefit individuals who want to understand their immunity status to Hepatitis B, including those who have completed vaccination and those considering vaccination. It may also be useful for individuals who want to confirm their antibody status for personal or occupational records.
3. When should I order this test?
You may consider ordering this test if you want to check your immunity to Hepatitis B, confirm your antibody response after completing a vaccination series, or determine whether vaccination may be needed. Your healthcare provider can help you decide if this test is appropriate for your situation.
4. What does this test measure?
This test measures Hepatitis B Surface Antibody (HBsAb) in a blood specimen and reports the result quantitatively, meaning it provides a specific antibody level rather than only a positive or negative result. This is a directly measured antibody level, not a calculated value. The test does not distinguish between antibodies from past infection and those from vaccination, and it does not identify whether an active HBV infection is present.
5. Do I need to fast before this test?
No special preparation is required for this test. It is recommended that you avoid biotin supplements for 24 hours before testing.
6. How quickly will I get results?
Results are typically available in 2-3 days. Results may take longer depending on weather, holidays, or other lab delays.
7. How do I interpret the results?
The meaning of your HBsAb level depends on your individual history, clinical context, and other laboratory findings. Factors such as vaccination history, prior HBV exposure, timing of testing, and other test results may all influence interpretation. A detectable antibody level does not necessarily distinguish between past infection and vaccination, and it does not confirm whether an active infection is present. Your healthcare provider is best positioned to interpret your result in the context of your overall health.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
8. What should I do if my results are abnormal?
If your results fall outside the expected range, review them with a qualified healthcare provider. They can help determine what the result means for you and whether any additional evaluation may be appropriate based on your individual health history.
9. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider, based on your individual circumstances such as vaccination status or prior HBV exposure.
Pre test preparation
No special preparation is required. Avoid biotin supplements for 24 hours before testing.
