Hepatitis B core antibody is one of the five quantitative hepatitis B examination items, if the hepatitis B core antibody is elevated, there are two situations, as follows: 1, once infected with the hepatitis B virus: If it is simply only this one positive, the other tests are negative, indicating that once infected with the hepatitis B virus, and the body’s immunity is stronger, has cleared the hepatitis B virus, there is no need to worry about whether the hepatitis B virus will be infected again afterwards . 2, window period: there is a situation is in the window period, because the hepatitis B core antibody is obviously longer than the hepatitis B surface antibody stay, must be timely review, to determine the other surface antigen is not positive, so you can also rest easy. If hepatitis B core antibody and hepatitis B surface antigen and hepatitis B e antigen are positive at the same time, it may be a sign of chronic hepatitis B.