<prompt> Investigation of choice for intermittent gastrointestinal obstruction:X-rayUSGEnteroclysisBarium meal follow-through  <response>: SBO IOC for Dx: X-ray Abdomen ERECT AIR-FLUID LEVELS SUPINE SITE OF OBSTRUCTION supine Erect Gold standard: Diagnostic unceainty High grade obstruction Etiology Strangulation IOC for Dx of low grade intermittent SBO: Enteroclysis 