Thromboelastography is not routinely performed clinically because it is relatively expensive. It is required mainly when the following types of disease histories are involved: first, thrombotic diseases, such as lower extremity deep vein thrombosis, pulmonary embolism, cerebral infarction, acute arterial embolism, coronary heart disease, angina pectoris, etc. Second, abnormal platelet disorders, such as primary and secondary thrombocytopenia, thrombocytopenic purpura. Third, relative to coagulation factor deficiency diseases, such as hemophilia, easy thrombosis. Fourth, fibrinolytic diseases, such as primary hyperfibrinolysis, diffuse intravascular coagulation, etc., are only considered for thromboelastography as long as they involve hemolysis or coagulation abnormalities, and thromboelastography is not particularly meaningful for ordinary patients.