Hepatitis B Surface Antibody is the immune protective property of the body against the surface antigen of the hepatitis B virus after infection with the hepatitis B virus. It plays the role of neutralizing the hepatitis B surface antigen. Positive antibody is commonly found in the recovery period, previous infection with hepatitis B virus, higher antibody of hepatitis B vaccination and so on. 1. If infected with hepatitis B virus and now in the recovery period, the patient will produce hepatitis B surface antibody at this time. 2. Previously infected with hepatitis B virus, but the body’s immune function has completely eliminated the virus and only surface antibodies are produced. The above two cases must be accompanied by positive core antibody of Hepatitis B Penta, or with or without positive Hepatitis B E antibody. 3. In Hepatitis B Penta test, only Hepatitis B Surface Antibody is positive, while all other tests are negative, suggesting that it is a protective reaction after Hepatitis B vaccine. The higher the antibody, the better, because the higher the protective effect. If you have positive surface antibodies, you can follow your doctor’s instructions for further testing if you are concerned.