Hemocoagulation is a screening test to check the coagulation function of the human body, because in the human body there are two processes of coagulation and lysis, and these two processes only maintain a dynamic balance, the human blood neither forms clots nor bleeds. Routine blood coagulation examination items include: first, prothrombin time, which is a screening test reflecting the exogenous coagulation pathway, the normal range is 11-13 seconds; second, partially activated prothrombin time, which is a screening test reflecting the endogenous coagulation pathway, the normal range is 31-43 seconds; third, fibrinogen is the coagulation factor, the normal concentration of fibrin is 2-4g/L, below or Higher than the normal range are abnormal; fourth, prothrombin time, which is a screening test in response to fibrinogen activity, the normal range is 16-18 seconds. Therefore, through the blood coagulation test, we can make a general judgment on the coagulation function of human body.