Acute traumatic coagulopathy (ATC) is associated with increased mortality and hospital transfusion requirements.1,2 Accurate prehospital identification of ATC may improve outcomes by expediting care. Unlike clinical scores, which may include subjective components,3 point-of-care (POC) international normalized ratio (INR) testing provides an objective value, which in the nontrauma setting correlates well with laboratory (LAB) INR results.4 The objective of this study was to evaluate the accuracy of a POC INR device comparedwith LAB INR to diagnoseATC in the prehospital environment.