How long hepatitis B antibodies last varies from person to person. Hepatitis B antibody refers to hepatitis B surface antibody, which is a kind of protective antibody. When a healthy person produces hepatitis B antibody through regular vaccination, it will have a protective effect on the body, but the titer of hepatitis B antibody will gradually decrease over time and may disappear. For people who have received hepatitis B vaccine, they should be tested for hepatitis B surface antibody in time. If the titer of hepatitis B antibody is more than 1000mIU/ml, it can usually be maintained for more than ten years. If the value is greater than 100mIU/ml, the antibody level can be maintained positive for at least 5-7 years. If the hepatitis B surface antibody level is weak, between 30-100mIU/ml, retesting is required in 3-5 years. If the hepatitis B surface antibody is weakly positive, between 10-30mIU/ml, it is best to get the hepatitis B vaccine, which allows the body to produce more hepatitis B surface antibodies. Ten years after the vaccination, blood should be drawn for the five hepatitis B tests to see if the hepatitis B surface antibody has turned negative or if the titer has decreased. In addition to the hepatitis B vaccination, attention should be paid to the daily prevention of hepatitis B virus transmission by developing good hygiene habits and not sharing personal items such as toothbrushes, towels and razors with others. Maintain personal hygiene and wear condoms during sex to prevent infection.