You're immune: Assuming this was a test for hepatitis B antibody from vaccine (HBsAb test), it is natural for the amount of antibody in the blood to decline over time after successful immunization. Recent research confirms that protection against hepatitis B is complete for years and probably life long, even if no antibody can be detected at all (assuming you had all 3 doses of vaccine).
Answered 9/14/2016
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