A positive surface antibody to hepatitis B indicates that the body has produced protective antibodies and is immune to infection by the hepatitis B virus, while all other antibodies are negative, indicating that the antibody was produced by vaccination against hepatitis B. Positive antibodies can effectively prevent reinfection with the hepatitis B virus. If contact is made with a person with hepatitis B, the organism can be protected from infection. Hepatitis B surface antibodies can also be tested qualitatively and quantitatively, with a positive test indicating a qualitative test and a quantitative test. The titer of the antibody reflects the strength of the body’s protection. Generally, if the hepatitis B surface antigen is >10 IU/mL, the antibody is positive and the hepatitis B vaccine is not necessary. If the hepatitis B surface antibody is negative, you can consider re-vaccination against hepatitis B.