Test Details: Hepatitis B is an infection of the liver caused by the hepatitis B virus (HBV). This test helps in detecting antibodies produced in response to an infection. This test is also used to diagnose chronic or acute hepatitis B virus (HBV) infection. It also screens a previous, resolved hepatitis B infection or is sometimes used to monitor treatment. Hepatitis B surface antigen (HBsAg) is the first serologic marker appearing in the serum 6 to 16 weeks following hepatitis B viral (HBV) infection. Hepatitis B surface antibody (anti-HBs) appears with the resolution of HBV infection after the disappearance of HBsAg. Hepatitis B core antibody (anti-HBc) appears shortly after the onset of symptoms of HBV infection.