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A novel mutation in the factor V gene of the blood coagulation cascade has been identified
recently. The mutation confers a lifelong hypercoagulable state, and carriers of the
mutation have an approximate eightfold increase in relative risk for the development
of venous thrombosis. Carriers of the mutation manifest a laboratory coagulation defect
termed resistance to activated protein C (APC). This article reviews the discovery
of APC resistance, the identification of the factor V gene mutation, and laboratory
approaches to their diagnosis.
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© 1996 Elsevier Inc. Published by Elsevier Inc. All rights reserved.