title: Fetal plasma erythropoietin concentration in severe growth retardation.
abstract: OBJECTIVE
  The aim of this study was to determine whether hypoxemia induces an increase in plasma erythropoietin concentration in human fetal life and, if so, whether this response stimulates fetal erythropoiesis.
  
  
  METHODS
  The plasma erythropoietin concentration in blood samples from 33 small-for-gestational-age fetuses at 26 to 38 weeks' gestation was measured. Measurements were compared with the reference range for gestation, and associations with PO2, pH, and erythroblast and erythrocyte counts were examined.
  
  
  RESULTS
  The mean plasma erythropoietin concentration in the small-for-gestational-age fetuses was significantly increased, and the degree of increase was significantly associated both with fetal acidemia and, more strongly, with fetal erythroblastosis.
  
  
  CONCLUSIONS
  Erythropoietin production in response to tissue hypoxia occurs from at least 26 weeks' gestation with measurable physiologic effects on erythropoiesis. Furthermore, more accurate assessment of tissue oxygenation may be obtained by measuring the erythroblast count rather than the blood pH.
authors.affiliation: Harris Birthwright Research Centre for Fetal Medicine, King's College School of Medicine, London, England.
authors.forename: R J
authors.initials: RJ
authors.lastname: Snijders
authors.forename: A
authors.initials: A
authors.lastname: Abbas
authors.forename: O
authors.initials: O
authors.lastname: Melby
authors.forename: R M
authors.initials: RM
authors.lastname: Ireland
authors.forename: K H
authors.initials: KH
authors.lastname: Nicolaides
mesh_terms: D004906:Erythrocyte Count; D004921:Erythropoietin / Q000097:blood*; D005312:Fetal Blood; D005317:Fetal Growth Retardation / Q000097:blood*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D012044:Regression Analysis
chemical_list: D004921:Erythropoietin; D010100:Oxygen