Abstract
ACCORDING to the concept that hemostasis is the resultant of an evolutionary development,1 vascular contraction was the first and the most primitive phase. This was followed by the appearance of a blood cell possessing the property of agglutination, and the final phase was the acquisition of the ability to form a fibrin clot. Even today, the role of the vascular component is still poorly defined, and only two simple tests are available to the clinical laboratory for study of the vascular response when injury occurs — the bleeding time and the tourniquet test. Neither procedure has been rigidly standardized and . . .

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