Based on years of work experience, from time to time, I encounter patients or consultants who do not understand or have incomplete knowledge of the relevant tests at the time of consultation, resulting in missed laboratory tests or unnecessary tests. Here I will only explain the common tests for hepatitis patients and why; in general, the common tests for hepatitis patients are routine blood tests, liver and kidney functions, pathogenic tests, imaging (ultrasound or CT, MRI) and nuclear medicine tests. Because each of these tests has its limitations, the selection of the examination program becomes necessary. The purpose of the general physical examination is to detect whether there is hepatitis B virus infection, and mostly choose liver function and hepatitis B marker determination, while some attendants mostly choose virus detection ignoring liver function examination, to understand the purpose of the examination is whether they are infected with hepatitis B virus and prepare for vaccination, but the vaccine cannot be injected when liver function is not normal. For hepatitis B virus infected people, we should choose according to their specific conditions: a. Hepatitis B carrier, only test liver function to understand whether there are inflammatory changes in the liver, while selective examination of hepatitis B two-and-a-half, to understand the growth of the virus antigen antibody, the size of the infectious, to do regular, generally once or twice a year, and those who have the conditions to do hepatobiliary ultrasound. The chronic hepatitis B patients, the examination of more items, the regular examination of routine blood, liver, kidney function, hepatitis B two to half, HBV-DNA and imaging examinations. If you are taking antiviral patients, the focus is on liver function, hepatitis B two-to-one and HBV-DNA, especially the change in the amount of HBV-DNA provides an important basis for determining the efficacy of therapeutic drugs and whether the virus is resistant to drugs. If there is a combination of other sexual diseases also have to do the relevant tests, which should be specific to the specific problem. For patients with cirrhosis, the relevant tests are the same as those for patients with chronic hepatitis B, but the focus is on imaging and laboratory tests for complications such as infection, bleeding, hepatorenal syndrome, hepatic encephalopathy, etc., to understand whether the disease is aggravated or whether there is cancer, and here the AFP (alpha-fetoprotein) test is essential because it is a diagnostic indicator of hepatocellular carcinoma and must be dynamically observed. Fourth, for patients with liver cancer, the focus is on imaging and liver function, and also AFP has an obvious role in treatment and prognosis.