The presence or absence of antibodies to hepatitis B mainly depends on the results of the five hepatitis B tests. The five hepatitis B tests can be divided into qualitative and quantitative, and the qualitative test is mainly based on whether the second of the five hepatitis B tests, the hepatitis B surface antibody, is positive. If it is positive, it means that there are antibodies and immunity to the hepatitis B virus; while if the second hepatitis B surface antibody is negative, it means that there is no immunity to the hepatitis B virus. If the other matters are also negative, you can go for hepatitis B vaccination. This is the time to look at the five quantitative hepatitis B tests to be able to get more information. If the second hepatitis B surface antibody is less than 10 IU/ml it means it is negative and you can go for the vaccination. If the hepatitis B surface antibody is greater than 10 IU/ml but less than 100 IU/ml, it means it is weakly positive, and after a period of time, this antibody will continue to decline or even be less than 10 IU/ml, so you should get a booster shot of hepatitis B vaccine. If the surface antibody is greater than 100IU/ml, it means that the antibody can still last for a very long time, so there is no need to do any treatment at this time, and you can rest assured that you are immune to the hepatitis B virus.