The HBsAb Rapid Test is, direct binding test for the visual detection of antibodies to hepatitis B surface antigen (Anti-HBs) in serum/plasma. It is used as an aid in the diagnosis of hepatitis B infection. The HBsAb Rapid Test is based on the principle of sandwich immunoassay for determination of Anti-HBs in serum/plasma. Purified recombinant antigens are employed to identify Anti-HBs specifically. This one step test is very sensitive and only takes 10-20 minutes. Test results are read visually without any instrument.