止血功能包括血管壁、血小板、凝血与抗凝血的作用,后者又包括纤维蛋白溶解系统的功能。正常情况下,各部分功能平衡,保证血管内的血液呈流态;血管损伤时血栓形成以止血。正常妊娠中晚期,由于产后止血的需要,大多数凝血因子在肝脏合成增加,同时纤溶活性降低,处于生理性的高凝状 Hemostatic functions include the action of blood vessel walls, platelets, coagulation and anticoagulation, which in turn includes the function of the fibrinolytic system. Under normal circumstances, the various parts of the function of balance to ensure that the blood vessels within the blood stream; blood vessels thrombosis to stop bleeding. Normal late pregnancy, due to the need for postpartum hemostasis, most of the blood coagulation factor synthesis increased in the liver, while reducing fibrinolytic activity, in the physiological hypercoagulable