This test will tell you whether you are immune to hepatitis B. It will not tell you whether you have a current hepatitis B infection.

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Hepatitis B is a liver infection caused by the hepatitis B virus (HBV) which causes inflammation and enlargement of the liver. HBV infections can vary from a mild form that lasts a few weeks, to a more serious (chronic) form, which can cause lasting liver damage.
This test looks for hepatitis B surface antibodies (anti-HBs) in the blood. The presence of anti-HBs normally indicates that you have either been infected and have recovered from hepatitis B or that you have been successfully vaccinated against it.