In this study, the lower limits of normal for neutrophil values at birth were 3500/mm3 in infants born at >36 weeks’gestation, 1000/mm3 in infants born at28 through 36 weeks’ gestation, and 500/mm3 in infants born at <28 weeks’ gestation. Peak values occurred at 6 to 8 hours after birth; the lower limits of normal at that time were 7500/mm3, 3500/mm3, and 1500/mm3 for infantsborn at >36 weeks’ gestation, 28 to 36 weeks’ gestation, and <28 weeks’ gestation, respectively.61 It is noteworthy that the study by Schmutz et al was performed at 4800 feet above sea level, whereas that of Manroe et al was performed at 500 feet above sea level.
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