Hepatitis B test, hepatitis B surface antibody was positive, what does it mean?

Hepatitis B surface antibody is positive, indicating that hepatitis B antibody in the body can protect the body and prevent hepatitis B virus infection. If hepatitis B antibody is lower than 100mlU/ml, the protection is relatively strong. If hepatitis B antibody is lower than 10-100mlU/ml, it represents weak protection and should be injected with hepatitis B vaccine.