Under normal circumstances, in the five hepatitis B serological tests, a hepatitis B surface antibody of more than 10 is considered positive, and the hepatitis B surface antibody is a protective antibody that indicates the body’s ability to defend itself against the hepatitis B virus. The surface antibody must be maintained at a relatively high titer, too low to be protective, so when the hepatitis B surface antibody reaches 500, it means that the antibody titer level is relatively high and there is no problem, and the higher the value the better. However, if you find that your titer is gradually decreasing, especially if it is below 10, you can get a booster shot of hepatitis B vaccine to increase the titer of surface antibody to enhance your ability to defend yourself against the hepatitis B virus.