Hepatitis B is also known as hepatitis B five, because two pairs of antigens and antibodies are tested, and the other pair of antigens and antibodies can only detect antibodies, so it is called hepatitis B two-and-a-half. The hepatitis B half test is divided into qualitative and quantitative testing methods.1. Qualitative testing methods can not see the value of each test item, only positive or negative. The quantitative test can see the specific value of each item.2 The qualitative test only roughly judges the condition of the hepatitis B patient, and some false positive or false negative results occur, while the quantitative test greatly reduces false positives or false negatives. The hepatitis B two-to-one test is for hepatitis B surface antigen, surface antibody, e antigen and e antibody, and core antibody.