Hepatitis B surface antigen negative should be analyzed in combination with other tests. If all the five tests of hepatitis B are negative, it indicates that there is no hepatitis B virus in the body, but there is no antibody against hepatitis B virus either. Hepatitis B surface antigen is one of the five tests of hepatitis B. Hepatitis B surface antigen itself is antigenic and not contagious, hepatitis B surface antigen negative needs to be analyzed with the results of the other four tests of hepatitis B. If all the five tests of hepatitis B are negative, it indicates that there is no hepatitis B virus in the body, and there is no hepatitis B antibody, and at this time, you should timely receive the vaccine against hepatitis B to prevent the infection. If hepatitis B surface antigen is negative and hepatitis B surface antibody is positive, it indicates that protective antibody already exists in the body, which may indicate that the body has been vaccinated with hepatitis B vaccine or has been infected with hepatitis B virus but has recovered, so the specific situation should be analyzed in conjunction with the results of the other four hepatitis B tests.