Do get the B12 checked. It needs to be at least at 500. Is there a reason for his iron to keep on dropping? Copper, zinc and iron are very closely tied and an excess/deficiency in one can cause an imbalance the others. So you need to correct the deficiency.
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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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