<prompt> In polytrauma with blunt abdominal injury, the first investigation to evaluate his abdomen isUSGCT ScanComplete HemogramAbdominal X-ray  <response>: Ans. aUSG is the first investigation to evaluate abdomen in bunt trauma.Ref. Schwartz 10the p. 179 and 9the p. 151; Washington Manual of Surgery 5the p. 373 CT scan is the best investigation. 