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There is no consensus regarding protein intake and the doses of recombinant human erythropoietin (r-HuEpo) and iron in the treatment of anaemia of prematurity (AOP). This open, randomized study has compared the effectiveness of 50 IU r-HuEpo/kg with that of 100 IU/kg, both given subcutaneously thrice weekly. In addition, two different protein supplements have been compared; lyophilized human milk protein and a commercial cow’s milk product. Total protein intake was 3 g/kg per day. Daily iron dose was 18–36 mg. “Healthy” preterm infants (n = 32, birth weight: 800–1400 g, gestational age ≤ 31 weeks) were studied from age 3 to 8 weeks. The two protein regimens yielded no differences in body growth, reticulocyte count or Hb concentration. In both r-HuEpo dose groups increased number of reticulocytes followed start of treatment; higher levels were, however, found in the group receiving 100 IU/kg …