Positive hepatitis B core antibody is a sign of having been infected with hepatitis B. However, to clarify the current status of the infection, it is necessary to combine it with other indicators of hepatitis B penta. Hepatitis B core antibody positivity alone, with all other items negative, is generally indicative of previous hepatitis B infection. Further checking of the hepatitis B viral load is needed; if the virus is negative, recovery is indicated; if the virus is positive, it indicates hepatitis B virus infection. Hepatitis B core antibody is positive while Hepatitis B surface antigen is also positive, this situation indicates that the person is infected with Hepatitis B virus, and further examination of liver function, liver ultrasound, Hepatitis B viral load and other indicators are needed to clarify whether treatment is needed. Hepatitis B core antibody is positive and hepatitis B surface antibody is also positive, which suggests that the person has recovered from hepatitis B vaccination or infection with hepatitis B virus and has produced protective antibodies, which is a normal phenomenon.