As knowledge of blood coagulation has advanced we have begun to examine not only the clinical entities associated with hemorrhage but also a group in which thrombosis represents the major problem. Thrombotic disorders believed to be associated with coagulation are recognized clinically but seldom investigated in the laboratory. The present approach to the problem is based on theoretical and experimental knowledge and a rapidly developing body of clinical information related to the role of platelets and antithrombin III in the initiation and control of thrombosis.
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