Fetal erythropoietin levels in pregnancies complicated by meconium passage: Does meconium suggest fetal hypoxia?

OBJECTIVE: We sought to determine whether umbilical cord plasma erythropoie tin levels were different in deliveries complicated by meconium passage and to determine whether this response is influenced by gestational age. STUDY DESIGN: Petal erythropoietin levels were measured in 203 appropriatel y grown neonates at 37 to 43 weeks of gestation; among those, 70 had passed meconium. RESULTS: Meconium passage in the entire population was associated with elev ated fetal erythropoietin levels (68 vs 31 mIU/mL; P < .001). Cord blood ga ses, pH, base deficit, and PO2, as well as the 1- and 5-minute Apgar scores , were not different between the meconium and no-meconium groups. Gestation al age and birth weights were significantly higher in the meconium group. S tepwise multiple regression analysis with meconium and gestational age used as the independent variables showed both meconium and gestational age to b e independently associated with fetal erythropoietin levels (r = 0.356, F = 14.5; meconium, P < .001; gestational age, P < .01). CONCLUSIONS: These results suggest that meconium passage can be associated with chronic fetal hypoxia as demonstrated by elevated fetal erythropoietin levels, independent of gestational age.