<prompt> What is the investigation of choice in a patient with blunt abdominal trauma with hematuriaUltrasonography of abdomenContrast enhanced tomographyIntravenous urogramRetrograde urogram  <response>: CT Scan of Abdomen: It is most commonly used and better investigation for abdominal trauma. It is useful in bluntpenetrating trauma, suspected pancreas, spleen, liver, duodenal, retroperitoneal injuries. Smaller injuries, early haemoperitoneum are better detected. It is noninvasive, highly specific, highly accurate 96, with low false-positivelow false-negative, noninvasive. Ultrasound Abdomen -Disadvantages: It is less useful in obesity, with interposition of gas, when fluid is less than 500 ml; retroperitoneal injuries and bowel injuries. SRBs Manual of Surgery, 4th Edition, pg. no. 151 