The quantification of hepatitis B surface antibody refers to the amount of antibodies. If the quantification of hepatitis B surface antibody is greater than 100mIU/L, it means that there is a protective significance and the protection is relatively strong. If the quantification of hepatitis B surface antibody is 10-100mIU/L, it is less protective and requires a booster dose of hepatitis B vaccine and a new test of hepatitis B surface antibody quantification after the booster. If the quantification of hepatitis B surface antibody is less than 10mIU/L, it is no longer protective and requires 3 doses of hepatitis B vaccine and a new quantification of hepatitis B surface antibody. Only if the quantification of hepatitis B surface antibody is greater than 100mIU/L, it is protective.