The effect of the in situ kidney on transfusion requirements and in vitro erythropoiesis was investigated in 20 patients with end stage renal disease undergoing hemodialysis. 6 of the 12 patients with in situ kidneys did not require transfusion, whereas the other 6 had an average monthly transfusion requirement of 277 ml of sedimented RBCs. All 8 anephric patients required transfusions with an average requirement of 352 ml of sedimented RBCs per month. Serum erythropoietin activity was inappropriately low for the degree of anemia in all but 1 patient, and bone marrow was uniformly hypocellular. Marrow cells from patients with in situ kidneys exhibited a greater response to erythropoietin than marrow cells from their anephric counterparts. The response was not improved by hemodialysis.
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