Blood tests are capable of detecting liver problems, and can even be used to initially determine the specific nature of liver lesions and the specific type of liver disease. For example, through the five hepatitis B tests and the quantification of hepatitis B virus DNA, it is possible to clarify the presence of hepatitis B virus infection, as well as the specific type of hepatitis B virus and whether antiviral treatment needs to be given. The determination of fetoprotein can be used to initially screen for the presence of primary hepatocellular carcinoma, especially for patients with previous hepatitis B, hepatitis C and cirrhosis. And with the liver fibrillation quadruple test, the degree of liver fibrosis can be initially determined. Although liver fibrosis is not a separate disease, it is also very effective in assessing the severity of many chronic liver diseases. Liver function is the most common type of liver blood test, and although it does not confirm the diagnosis of a specific disease, it reflects the presence of liver cell damage, the function of liver synthesis, metabolism and conversion, and the patency of the biliary tract.