Possible reason: My guess is that you have been immunized against hepatitis b which is the anti_hbs. You have antibodies against a protein on the surface of the virus; this is a normal response to the vaccine. You don't have the core antibody which is what we see after infection (anti hbc) if you were recently vaccinated you should wait at least 4-6 weeks before donating blood.
Answered 6/6/2013
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