Hepatitis B surface antibody is a protective antibody. If the hepatitis B surface antibody test is positive with a plus sign, it proves that the body is protective against the hepatitis B virus, and generally a small amount of exposure to the virus will not lead to infection. If you have positive hepatitis B surface antibody and other five indicators, especially if you have positive hepatitis B surface antigen, you may be infected with hepatitis B virus. If there are abnormalities, DNA and liver function tests should be performed to determine if treatment is needed as soon as possible.