Hepatitis B surface antibody is lower than the normal value indicates that there are fewer hepatitis B antibodies in the body, the protection ability of the human body is weak, it is recommended that under the guidance of the doctor to make up for the hepatitis B vaccine. Hepatitis B is an infectious disease caused by hepatitis B virus infection, which manifests itself in symptoms such as pain in the liver area and fatigue, etc. Clinically diagnosed through the detection of hepatitis B surface antigen and other indicators, hepatitis B surface antibody can be produced through the hepatitis B vaccine, which protects the human body from hepatitis B virus infection. Hepatitis B surface antibody is lower than normal value indicates that there are fewer hepatitis B antibodies in the body, and it is generally believed that hepatitis B surface antibody titer is greater than 10mIU/ml, which has a good protective effect on the human body. Hepatitis B surface antibody is lower than normal value indicates that there is less hepatitis B antibody in the body, which can not protect the body from hepatitis B virus infection, it is recommended to get booster shot of hepatitis B vaccine under the instruction of doctor.