Hemostasis - Definition

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Definition


Hemostasis is the process that will stop bleeding. It is divided into two phases. At the first sign of bleeding, vasoconstriction occurs. Then primary hemostasis occurs involving platelets taken on at the site of a vascular breach, which will form a blood mass, called a platelet plug or white thrombus. Then comes secondary hemostasis, better known as coagulation: the second phase uses proteins in the blood, which will enable the accumulation of fibrin and the transformation of white thrombus into red thrombus which forms a blood clot. Hemostasis is a process which takes three to six minutes in normal individuals. Disorders of hemostasis are researched by studying the different time the hemostasis process takes, from the bleeding time, the activated partial thromboplastin time, and the prothrombin time.

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