The window period of hepatitis B is the stage when the hepatitis B virus has entered the body and has not yet caused the body’s immune system to produce antibodies. During the window period, even though the patient has been infected with the virus, the results of the antiviral antibody test are negative because the antibodies against the virus are not stable. A window period of 2 weeks to 3 months is common, and a few people have a longer period, which can reach 4-5 months, but rarely exceeds 6 months. So after you suspect you have hepatitis B infection, you usually get tested after 6 months. If you are still negative, you can be sure that you are not infected with hepatitis B at this time. The window period for hepatitis B is calculated from the time of suspected infection with the hepatitis B virus. If you are exposed to the hepatitis B virus by injection, blood contact or sexual intercourse, the window period is counted from the time of the act, and the time for the antibody test should be postponed by 1 month.