Abstract
This study investigated erythropoiesis in very low-birth-weight infants with special reference to the role of protein status in the regulation of erythropoiesis in 22 appropriate- and 11 small-for-gestational-age infants. Blood samples were drawn at three and six weeks of age. The serum concentrations of erythropoietin, estimated by a solid-phase enzyme immunoassay, were similar in the two groups at both study ages. The total circulating erythrocyte volume and the serum concentration of prealbumin were higher in the appropriate- than in the small-for-gestational-age infants at three and six weeks of age. The former group had a better protein status, although their protein intake was similar or lower. We conclude that erythropoiesis in very low-birth-weight infants is influenced more by protein status and prenatal growth than by serum concentration of erythropoietin.
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