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Like the others have said, Celiacs should be looked into as a possible reason for malabsorption. Unfortunately, the tests for this are not very accurate...false negatives occur quite frequently. The best thing to try is to go gluten free for a month and see how he does.
Also, if you are taking a B12 supplement, your serum levels will look better than they probably are. It's a good idea to stopped B12 about a week before testing.
Vitamin C increases the uptake of iron in the gut. While tea, coffee, wine and milk can interfere with it.
I hope you get some answer soon.
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Marlene, wife to John DX w/SAA April 2002, Stable partial remission; Treated with High Dose Cytoxan, Johns Hopkins, June 2002. Final phlebotomy 11/2016. As of July 2021 HGB 12.0, WBC 4.70/ANC 3.85, Plts 110K.
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