* The purpose of the HBsAg elisa test is to diagnose patients who are suspected of having a hepatitis B virus infection and/or for blood donor screening. * This HBsAg test is an enzyme-linked immunosorbent assay for the qualitative identification of HBsAg in human serum/plasma and one of the best methods available for either screening blood donors or in the clinical diagnosis of hepatitis B-infected individuals. * Excellent high level of sensitivity and specificity. * Simple buffer assay rack for safety use. * System configuration compatible with all common ELISA reader equipments. * Stability: 12 months at 2~8℃ * Sensitivity: 100% * Specificity: 100%