Recombinant human erythropoietin (rh-EPO) was administered to 11 anemic children with end-stage renal disease who were undergoing hemodialysis. Hematocrit (Hct), absolute reticulocyte count (retics), creatine concentration of red cells and erythrocyte density test (EDT) were chosen as indicators of rh-EPO effect on erythropoiesis. In the present report the first 9 weeks shall be presented in which all patients received an identical dosage of rh-EPO per kg body weight. The pre-EPO values of retics, creatine and EDT varied considerably. In 10 patients the Hct increased to 0.30 after 9 weeks of rh-EPO treatment. Retics and creatine rose in all cases above the normal range, rates of increase and maximal values differed. Retics, creatine and EDT respond faster to rh-EPO than Hct. Retics and creatine seem to be equally good indicators of rh-EPO stimulated erythropoiesis. The EDT showed an increase only up to the 4th week.
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