What does hepatitis B surface antibody negative mean?

Hepatitis B surface antibody

is a protective antibody, which is produced after the body is stimulated by hepatitis B surface antigen. It can eliminate hepatitis B virus in the body and protect the body from infection. Hepatitis B surface antibody and hepatitis B surface antigen, hepatitis B e antigen, hepatitis B e antibody, hepatitis B core antibody are called hepatitis B five items. In clinical analysis, it is necessary to combine other four comprehensive evaluations. Clinical judgment cannot be made by only one index. For example, when all five indicators are negative, it means that the patient is not infected with hepatitis B, but has not been vaccinated with hepatitis B vaccine, and the body has no protective antibody and is susceptible to hepatitis B virus infection; if hepatitis B antigen is positive, it means that the body is infected with hepatitis B.