You can find in this blog at least 6 references talking about Contrast vs Non contrast CT, but this new study in Annals of EM showed the same result that oral contrast in detecting intra-abdominal pathologies is useless. Wow, this is a big word. USELESS.
12,044 patients enrolled, 5,276 patients had CT scan with IV con, 4,987 patients had no Po or Po contrast. 20 % had Oral con and 80% did not have Oral contrast. they did not find any meaningful detection of intra-abdominal injury between CT with and without oral contrast.