There are two types of tests for hepatitis B surface antibodies: qualitative tests for hepatitis B surface antibodies, with a positive result representing the presence of surface antibodies in the body and a negative result representing the absence of surface antibodies in the body. Most medical institutions use the more sensitive chemiluminescence quantitative test. When the test result is greater than 10mIU/mL, it is equivalent to a positive result of the qualitative test, which means that there are hepatitis B surface antibodies in the body; if the test result is less than 10mIU/ml, it is equivalent to the absence of hepatitis B surface antibodies in the body. Hepatitis B surface antibody is a kind of neutralizing antibody, which can neutralize the hepatitis B virus that invades the body and can prevent the body from being infected by the hepatitis B virus, so it is a good antibody. The purpose of preventive vaccination against hepatitis B is to make the body produce surface antibodies for the purpose of preventing infection by the hepatitis B virus.