One Step Cassette Style HBV Test is a rapid direct binding test for the visual detection of HBsAg, Anti-HBs, HBeAg, Anti-HBe,Anti-HBc, in serum (whole blood) as an aid in the diagnosis of hepatitis B infection. One Step HBV Test is based on the principle of double antigen sandwich, double antibody sandwich and restrain for determination of HBV in serum (whole blood).