Hepatitis B two-and-a-half is the abbreviation of serum immunomarkers after infection with hepatitis B virus, specifically including hepatitis B surface antigen, surface antibody, e antigen, e antibody, c antibody (core antibody). The common results are as follows: 1. Major triple-positive: HBsAg, HBeAg, HBcAb positive, suggesting a high replication state of the virus, accompanied by high levels of HBV-DNA; 2. Minor triple-positive: HBsAg, HBeAb, HBcAb positive, suggesting a low replication state of the virus, with relatively low HBV-DNA. 3.HBsAg, HBcAb positive: Hepatitis B virus infection, need to combine with HBV-DNA level to determine the replication status of the virus; 4.HBcAb positive: Previously infected with hepatitis B, whether or not currently carrying the virus is unknown, need to combine with HBV-DNA results; 5.HBeAb, HBcAb positive: Previously infected with hepatitis B, whether or not currently carrying the virus is unknown, need to combine with HBV-DNA result analysis; 6, HBsAb, HBeAb, HBcAb positive: recovery period after hepatitis B infection, the patient has been cured and does not need treatment. 7, HBsAb positive: the result of successful vaccination, or complete recovery from infection with protective antibodies (HBsAb). HBsAg and HBsAb are theoretically not positive at the same time unless the S gene of the virus has mutated. HBeAg and HBeAb are also generally not positive at the same time, but sometimes there are false positives, which should be combined with HBV-DNA tests to determine the replication status of the virus. Regardless of the hepatitis B two-to-one results, they need to be combined with the HBV-DNA test in order to more accurately determine the level of viral infection and replication, because there are some interfering factors in the immune index.