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Did you ever cjeck the obvious? Have your parents or siblings ever been tested for Hep B? It is very likely you got it from early on if you are from Asia.
HBsAg (hepatitis B surface antigen)
HBsAb or Anti-HBs (hepatitis B surface antibody)
HBcAb or anti-HBc (hepatitis B core antibody)
The doctor needs all 3 blood test results in order to determine your diagnosis.
What is the hepatitis B surface antigen (HBsAg)?
This tests for the presence of virus. A "positive" or "reactive" HBsAg test result means that the person is infected with the hepatitis B virus, which can be an "acute" or a "chronic" infection. Infected people can pass the virus on to others through their blood and infected bodily fluids.
What is the hepatitis B surface antibody (HBsAb or
anti-HBs)?
A "positive" or "reactive" HBsAb (or anti-HBs) test result indicates that a person has successfully responded to the hepatitis B vaccine or has recovered from an acute hepatitis B infection. This result means that you are immune to future hepatitis B infection and you are not contagious. This test is not routinely included in blood bank screenings.
What is the hepatitis B core antibody (HBcAb)?
The HBcAb is an antibody that is part of the virus- it does not provide protection. A "positive" or "reactive" HBcAb (or anti-HBc) test result indicates a past or present infection, but it could also be a false positive. The interpretation of this test result depends on the results of the other two tests. Its appearance with the protective surface antibody (positive HBsAb or anti-HBs) indicates prior infection and recovery. For chronically infected persons, it will usually appear with the virus (positive HBsAg).
from Hepatitis B Foundation