Coagulation function needs to routinely check the following four indicators: 1, prothrombin time TT; 2, prothrombin time PT; 3, fibrinogen FIB; 4, partial thromboplastin APTT, of which prothrombin time PT, mainly reflects the function of the exogenous coagulation system. PT prolongation is seen in congenital coagulation factor deficiency or vitamin K deficiency liver disease, oral anticoagulants, etc., PT shortening is seen in congenital The APTT mainly reflects the endogenous coagulation system. Patients with coagulopathies such as hemophilia need to have their coagulation function checked. In addition, patients with hepatic impairment or liver disease need to check coagulation function. Patients with cirrhosis will have prolonged prothrombin time, especially in the decompensated phase of cirrhosis, and coagulation function needs to be routinely checked before various surgeries.