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We sought evidence of hypercoagulability in 59 seriously injured trauma patients. An extended coagulation profile (consisting of tissue plasminogen activator antigen concentration, plasminogen activator inhibitor, serum antithrombin III, protein C antigen, functional protein C, protein S antigen, D-dimer, and prothrombin fragment 1.2) was compared to control values. Laboratory evidence of hypercoagulability was seen in 85% (n = 50) of the patients. Patients with an Injury Severity Score (ISS) > or = 16 (n = 36) had significantly elevated levels of D-dimer and decreased levels of functional protein C compared to patients with an ISS < or = 15 (n = 23). Functional protein C had a negative correlation (r = -0.44; p < 0.001) with the ISS. A hypercoagulable state exists immediately following severe trauma. Greater injury severity may increase this hypercoagulable state. Decreased levels of functional protein C best correlated with increased injury severity.

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