<prompt> Investigation of choice in an unstable patient with suspected intraabdominal injury isDPLUSGCT scanX-ray abdomen  <response>: The investigation of choice in an unstable patient with suspected intraabdominal injury is ultrasound. Focused abdominal sonar for traumaFAST is a technique whereby ultrasoundsonar imaging is used to assess the torso for the presence of free fluid, either in the abdominal cavity, and is extended into the thoracic cavities and pericardiumeFAST. eFAST is accurate at detecting 100ml of free blood. CT is the gold standard for the intr-abdominal diagnosis of injury in the stable patient. Reference: Bailey love, 27th Edition, page no 372. 