Hepatitis B surface antigen does not have to be 0 to be normal, usually hepatitis B surface antigen less than 0.18ng/ml is normal. Hepatitis B is an infectious disease caused by the hepatitis B virus, which manifests symptoms such as pain in the liver area and fatigue, and is clinically diagnosed through the detection of hepatitis B surface antigen and other indicators, and can be treated with interferon, lamivudine, famciclovir, and other medications after diagnosis. Hepatitis B surface antigen is one of the signs of hepatitis B virus infection, indicating that it has been infected with the hepatitis B virus or is being infected with the hepatitis B virus, and its normal value is less than 0.18 ng/ml. Hepatitis B surface antigen less than 0.18 ng/ml indicates that you may be a carrier of the hepatitis B virus, but you won’t show any symptoms and infect others, so it is recommended that you test for the indicators of hepatitis B surface antigen regularly. In addition, due to the different testing organizations and methods, it is recommended to consult the testing organization and professional physicians to determine whether you are infected with the hepatitis B virus. Hepatitis B surface antigen does not have to be 0 to be normal, usually less than 0.18ng/ml is normal, it is recommended to check the hepatitis B surface antigen and other indicators regularly, and consult a doctor when there is any abnormality.