2016年8月19日 · HBsAb = Hepatitis B surface antibody that is produced because the body has been exposed to the Hepatitis B virus (HBV). HBsAg = Hepatitis B surface antigen, this is the part of the virus that induces an immune response. Presence of either HBsAb and/or HBsAg mean different things: Presence of HBsAb = the body has been exposed to HBV. It usually ...