Most of the time, when we usually refer to hepatitis B, we mean the state of hepatitis B virus infection. As mentioned above, the spectrum of diseases caused by hepatitis B virus infection includes different types of diseases such as hepatitis B virus carriers, acute hepatitis B, chronic hepatitis B, liver cirrhosis, liver cancer, etc., and these diseases can transform into each other. Therefore, the so-called “diagnosis of hepatitis B” is not only to clarify the presence or absence of hepatitis B virus infection, but also to find out what kind of disease state the patient is in. For this reason, the following items need to be checked regularly in patients with hepatitis B virus infection: 1. Hepatitis B five: for screening or detecting hepatitis B virus infection, as well as monitoring the evolution of acute hepatitis B. 2. 2, HBV DNA: for monitoring the replication of hepatitis B virus, as well as the effectiveness of antiviral therapy. 3.Liver function: used to monitor the presence of inflammation and damage to the liver, as well as to assess the degree of liver inflammation. 4.Liver, gallbladder and spleen ultrasound: used to detect cirrhosis and liver cancer. 5.Fetoprotein: used to screen for liver cancer. In addition, in some special cases, doctors may recommend hepatitis B patients to have one or more of the following items based on the results of the above 5 routine tests: 1.Liver puncture: also called liver pathology examination, liver histology examination, which is a test to accurately determine the degree of liver inflammation and fibrosis in hepatitis B patients. 2, Liver elastometry: also called liver stiffness scan, liver transient elastography, Fibroscan, is a newly invented non-invasive method to detect the degree of liver fibrosis and can replace liver puncture in some cases. 3. CT or MRI of the liver: used to confirm the diagnosis of liver cancer.