1, reflecting the liver cell injury test: including serum enzymes and blood please iron, to blood phosphatase (ACP), γ-glutamyltransferase (γ-GT) and so on. Clinically, various enzyme tests, ALT, AST can be sensitive to indicate hepatocyte injury and the degree of injury, reflecting the acute liver fine high injury to ALT is the most sensitive, reflecting its degree of injury is more sensitive AST, in the recovery period of acute hepatitis, although ALT is normal and γ-GT continues to rise, indicating hepatitis chronicity. Chronic hepatitis γ-GT persistently does not fall often indicates lesion activity. 2, reflecting the liver excretory function of the test: calculate the liver to certain endogenous (methemoglobin, bile acids, etc.) or exogenous (dyes, drugs, etc.) high uptake of excretion and clearance capacity, clinical detection of bilirubin quantitative commonly used, total when the bilirubin is greater than 17. 1μmd / L for jaundice cases, if the bilirubin progressive rise and accompanied by a decline in ALT, called enzyme bile separation, suggesting aggravation of the disease, there is a shift to severe The possibility of turning into severe hepatitis. 3, reflecting the liver reserve function of the test: plasma protein (ALb) and prothrombin time (PT) is the routine test by detecting the synthesis function of the liver to reflect its reserve capacity. a decline in ALb suggests a weakening of protein synthesis, PT prolongation suggests a decrease in the synthesis capacity of various coagulation factors. 4. Tests reflecting interstitial changes in the liver: serum protein electrophoresis has largely replaced flocculent reflection, and the degree of increase in γ-globulin grams to evaluate the evolution and prognosis of chronic liver disease, suggesting hypocellularity and inability to remove endogenous or enteric antigenic substances from the blood circulation. In addition, serum levels of hyaluronic acid, laminin, type III procollagen peptide and type IV collagen reflect changes in hepatic endothelial cells, lipid storage cells and fibroblasts, which are closely associated with liver fibrosis and cirrhosis.