Hepatitis B surface antibody quantification is a quantification of hepatitis B surface antibodies and reflects the titer of hepatitis B antibodies in the body. It can be used to determine whether the hepatitis B vaccination has been successful and whether the hepatitis B surface antibody is still protective. Hepatitis B surface antibody (HBsAb or anti-HBs) is a protective antibody, and the higher the titer, the stronger the protective effect. Its normal value is usually 10mIU/ml. When it is greater than 10mIU/ml, it means that HBsAb can effectively protect the body; when it is less than 10mIU/ml, the protective effect of HBsAb is weakened. At this time, the risk of contracting hepatitis B is high, and it is best to get a booster shot of hepatitis B vaccine to enhance its protective effect. However, as time goes by, the titer of HBsAb changes and tends to gradually decrease. Therefore, to ensure effective protection for the body, both newly vaccinated people and those who have been vaccinated for 3-5 years should have their hepatitis B surface antibody quantified to determine its protective ability. When its highest titer is between 10 and 100 mIU/m1, it is best to have another vaccination after six months; when its highest titer is between 101 and 1000 mIU/ml, it should be reviewed within 1 to 2 years after the first vaccination; when its titer is between 1001 and 10000 mIU/ml, it can be reviewed within 2 to 4 years; when its titer is higher than 10000 mIU/ml, it can be reviewed within 4 to 6 years. ml, it can be rechecked within 4-6 years. Therefore, HBsAb has a protective effect on the human body, and hepatitis B surface antibody quantification is a quantitative check of hepatitis B surface antibody in the body. If you want to prevent hepatitis B virus infection effectively, you should check hepatitis B antibody surface quantification scientifically and regularly.