A complete coagulation test is a comprehensive examination of the body’s blood clotting function. The first test, coagulation time, is the time it takes for blood to clot when peripheral blood is drawn from a patient and placed in a test tube. The second test, prothrombin time, is a test that reflects the concentration and activity of fibrinogen. The third item, prothrombin time, is a screening test that responds to the exogenous coagulation pathway, and also in clinical patients taking warfarin, the prothrombin time is observed to adjust the dose of the drug and to understand the effect of treatment. The fourth item, partial activation prothrombin time, which is a screening test reflecting the endogenous coagulation pathway, is usually observed in patients taking heparin clinically to understand the therapeutic effect and adjust the drug dose. There is also fibrinogen concentration, the normal range is 2-4g/L. By measuring fibrinogen concentration, it is possible to know the concentration of human fibrin.