The normal value of hepatitis B virus surface antibody has different normal values under different circumstances. 1. If the patient has not had hepatitis B before and has not been vaccinated against hepatitis B, the normal value of hepatitis B virus surface antibody is negative, in quantitative terms it is less than 10mIU/mL. 2. If the patient has been vaccinated against hepatitis B before and has not been exposed to hepatitis B virus, the normal value is positive or greater than 100mIU/mL. /The normal value of hepatitis B surface antibody can be weakly positive or positive if it is between 10-100mIU/mL, but it needs to be reinforced by hepatitis B vaccination. 3. The patient has had hepatitis B before, but the hepatitis B virus has not led to chronic infection, that is, hepatitis B is cured, and the body’s own immune ability clears the virus. The normal value of hepatitis B surface antibody can be weakly positive or positive. A weak positive value is only required to be greater than 10mIU/mL, and there will also be positive core antibody or hepatitis B e antibody. These are the three normal values for hepatitis B virus surface antibody.