Hepatitis B two halves is to check the hepatitis B pathogenicity markers, including hepatitis B surface antigen, hepatitis B surface antibody, hepatitis B e antigen, hepatitis B e antibody, hepatitis B core antibody, as follows: First, if the hepatitis B surface antigen, hepatitis B e antigen, hepatitis B core antibody, this three positive is known as triple positive, generally suggests that the hepatitis B virus replication is more active, more contagious. If the hepatitis B surface antigen is positive, the hepatitis B e antigen and the hepatitis B core antibody are positive. Second, if the hepatitis B surface antigen is positive, hepatitis B e antibody is positive, hepatitis B core antibody is positive, these three positive is called small triple positive, suggesting that the hepatitis B virus replication, in a quiescent state, is not highly contagious, the virus replication is not active, the viral load is relatively low. If these five items are negative, it suggests that there is no infection of hepatitis B virus. Fourth, if the hepatitis B surface antibody is positive and the hepatitis B core antibody is negative, it suggests that the hepatitis B virus has been infected, and the virus has been cleared and protective antibodies have been produced.