Hepatitis B two-to-one test is the most important test to diagnose hepatitis B. What is hepatitis B two-to-one test? Hepatitis B two-to-one test is also called hepatitis B five, it mainly includes the following indicators. The first pair is hepatitis B surface antigen and hepatitis B surface antibody, the second pair is hepatitis B e antigen and hepatitis B e antibody, and the half pair is also known as hepatitis B core antibody. Why is it just half? In fact, it is a pair with the hepatitis B core antigen, but because it is difficult to find the hepatitis B core antigen in the blood, only the hepatitis B core antibody can be found, so the hepatitis B five items only check this one item is also called half pair, this is the origin of the hepatitis B two and a half.