What tests are usually needed when I suspect that I have the disease? If you suspect that your baby has hepatitis B, you will usually only need to have a blood test for hepatitis B and liver function tests. Nowadays, there are two types of tests: quantitative and qualitative. The qualitative method can only check if the test is positive/negative, while the quantitative method can clearly quantify the amount of antigen or antibody. The former is simple, inexpensive and suitable for primary screening tests; the latter is expensive and is adapted to the dynamic observation of clinical treatment cases. When should I be tested for hepatitis B? Hepatitis B 2.5 test can be performed on people who are suspected of having hepatitis B infection; family members, especially mothers, who have hepatitis B. How is the type of hepatitis B diagnosed? According to the serology, virology, biochemical tests and other clinical and auxiliary examination results of HBV-infected patients, chronic HBV infection can be divided into: I. Chronic hepatitis B (1) HBeAg-positive chronic hepatitis B: serum HBsAg, HBeAg-positive. Anti-HBe negative, HBV DNA positive, ALT persistently or repeatedly elevated, or liver histological examination with hepatitis lesions. (2) HBeAg-negative chronic hepatitis B: positive serum HBsAg, persistently negative HBeAg, positive or negative anti-one HBe, positive HBV DNA, persistently or repeatedly abnormal ALT, or hepatitis lesions on liver histological examination. Based on biochemical tests and other clinical and ancillary findings, the above two types of chronic hepatitis B can also be further classified as mild, moderate and severe. II. Carriers (1) Chronic HBV carriers: mostly HBsAg, HBeAg and HBV DNA positive people in the immune tolerance period, with more than 3 consecutive follow-ups within 1 year showing serum ALT and AST in the normal range and no significant abnormalities in liver histological examination. (2) Inactive HBsAg carriers: serum HBsAg positive, HBeAg negative, anti-HBe positive or negative, HBV DNA below the minimum detection limit, more than 3 consecutive follow-ups within 1 year, ALT are in the normal range. III. Occult chronic hepatitis B Serum HBsAg negative, but HBV DNA positive in serum and/or liver tissue with clinical manifestations of chronic hepatitis B. In addition to HBV DNA positivity, patients may have positive serum anti-HBs, anti-HBe and/or anti-HBc, but about 20% of patients with occult chronic hepatitis B are negative for serologic markers. Diagnosis requires exclusion of liver injury caused by other viral and non-viral factors.