i "c" what the problem is.. it appears that he may have lactose intolerance which would definitely be the first in the differential list hence you would do the hydrogen breath test to rule it out. my one eyebrow is going up however since he's 22 and LI could've been detected much earlier in his life.. (history could help) and there on, i would think about micro tests for possible food poisoning.. etc etc.

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Discharge status: Alive but w/out permission
SJSM'09