Positive core antibody to hepatitis B virus alone is usually indicative of previous hepatitis B virus infection. Hepatitis B virus core antibody is mainly the antibody against the core antigen of hepatitis B virus produced by the human body during the replication of hepatitis B virus, which has no obvious protective effect on the human body. It is also the earliest signature antibody produced in the serum after hepatitis B virus infection and is present for a long time in the recovery period of patients and chronic hepatitis B virus carriers. Hepatitis B virus core antibodies can be further categorized into IgM and IgG, of which the IgM type is mainly indicative of hepatitis B virus infection in the acute phase, or chronic hepatitis B virus entering the active phase. As the condition improves, the IgG type is mainly produced, indicating that the hepatitis B virus has been infected in the past, but the virus has now been cleared. Hepatitis B Virus Core Antibody Positive specifics, but also need to be combined with the patient’s hepatitis B 5 results and liver function and other tests, a comprehensive assessment of the understanding of the condition.