Diagnostic imaging of acute abdominal pain in adults:
CT of the abdomen and pelvis, preferably with contrast, is the imaging modality of choice if there is significant concern about serious pathology or if the diagnosis is unclear from the H&P and lab tests.
Cartwright SL, Knudson MP: Diagnostic imaging of acute abdominal pain in adults. Am Fam Physician 2015;91(7):452-459.