How long does it take to check antibodies after finishing hepatitis B vaccine?

Generally speaking, after the full injection of hepatitis B vaccine, about a month can go to the hospital to check the antibody. If there is antibody generation in the body, it shows that it can effectively resist the invasion of hepatitis B virus. After each year to go to the hospital to do a hepatitis B two-and-a-half check, when the antibody protection weakened, you can consider playing a booster shot.