Did Your Hepatitis B Vaccine Actually Work? Here’s How to Check
Most people get the hepatitis B vaccine series as a child or as part of a job requirement, and then never think about it again. But vaccines aren’t 100% effective for every single person, and confirming your own immunity is often simpler than people expect.
The Hepatitis B Surface Antibody test measures your level of protective antibodies. A sufficient level generally confirms the vaccine worked (or that you had a past infection that resolved and left you immune).
Common reasons to check
- A healthcare job requiring documented proof of immunity
- It’s been many years since your original vaccine series
- You’re not sure you ever completed the full series
If the level comes back too low, a doctor may recommend a booster dose — a quick fix once you actually know.
What to expect
No fasting needed.
Ready to order? The Hepatitis B Surface Antibody, Quantitative 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.