We aim to test the changes of coagulation parameters after the TBI by thromboelastography. Eleven patients who underwent TBI between march 2005 and march 2006 in our department were included in this study. Blood samples were taken from all patients immediately before the delivery of TBI and 12 hours after the completion of TBI. Complete blood counts, partial thromboplastin time (aPTT), prothrombin time (PT), and the fibrinogen levels were measured. FIB-EXTEM, extrinsic (TEG-EXTEM), intrinsic (TEG-INTEM) clotting pathways, and platelet functions were measured by rotational thromboelastogram (ROTEM). All measured parameters were compared by using wilcoxonpaired test.