The surface antigen of hepatitis B is positive indicating the status of a person infected with the hepatitis B virus, but whether it is contagious depends mainly on the DNA of the hepatitis B virus in the body. some people with a small hepatitis B triplet have a negative virus in the body, which means they are not contagious. However, the value of surface antigen in this case is usually low, and if the surface antigen quantification is very high, it is usually contagious. The surface antigen quantification of hepatitis B is related to the active intensity of hepatitis B virus replication, the body’s hepatitis B virus replication is active, the higher the surface antigen, hepatitis B virus replication is not active, the surface antigen is low, you can indicate the progress of the disease through the regular review of the surface antigen.