['The purpose of this study was to determine the relationship between coagulopathy and outcome after traumatic brain injury.', 'Patients admitted with a traumatic brain injury were enrolled prospectively and admission blood samples were obtained for kaolin-activated thrombelastogram and standard coagulation assays. Demographic and clinical data were obtained for analysis.', 'Sixty-nine patients were included in the analysis. A total of 8.7% of subjects showed hypocoagulability based on a prolonged time to clot formation (R time, > 9 min). The mortality rate was significantly higher in subjects with a prolonged R time at admission (50.0% vs 11.7%). Patients with a prolonged R time also had significantly fewer intensive care unit-free days (8 vs 27 d), hospital-free days (5 vs 24 d), and increased incidence of neurosurgical intervention (83.3% vs 34.9%).'] Is thrombelastography-identified coagulopathy associated with increased morbidity and mortality after traumatic brain injury?