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Comment Re:What the what what? (Score 4, Informative) 270

Gastro-Intestinal aka the bit between the mouth and the anus. This stuff shows up (contrasts) on x-rays. Upper studies involve drinking it. Lower studies involve insertion from the other end. In other words, it's used for testing gut disorders and if you aren't swallowing it, you can shove it up your arse.

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