Evaluating the Use of Thromboelastography to Diagnose Coagulopathy After Traumatic Brain Injury

The investigators will obtain thromboelastography (TEG) on pediatric patients admitted to the Rady Children's Hospital ICU after traumatic brain injury on admission to our ICU and after 24 hours of care. The investigators hypothesize that TEG will identify abnormalities of coagulation that are not identified by traditional coagulation studies, i.e. prothrombin time (PT), activated partial thromboplastin time (aPTT), and international normalized ratio (INR).