HBsAg ELISA Kit is used for the in vitro detection of Hepatitis B surface antigen (HBsAg) including the subclass of HBsAg in human plasma or serum. This kit is an enzyme-linked immunosorbent assays for qualitative detection of hepatitis B viruses in human serum or plasma samples. This kit is mainly intended for research use. It uses polystyrene microwell strips pre-coated with monoclonal antibodies specific to HBsAg.