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• W2023453460 abstract "Objectives To refine the reference range for the zinc protoporphyrin–to–heme ratio (ZnPP/H) of preterm infants, we assessed the impact of maternal risk factors on ZnPP/H and evaluated the impact of changes in iron supplementation on iron status. Study design The reference range for neonatal ZnPP/H was refined using prospective data from 31 reference infants ≤35 weeks’ postmenstrual age (PMA) plus retrospective data from 51 infants <30 weeks’ PMA, and 59 infants 30-40 weeks’ PMA. Cord blood and first week of life values were compared when both were available. The impact of maternal risk factors was assessed by examining prospectively collected ZnPP/H from 48 high-risk infants. The effect of changing iron supplementation guidelines was evaluated by retrospective chart review of serial ZnPP/H from 194 infants. Results Cord ZnPP/H was lower at 30-35 weeks’ gestation than at 24-26 weeks’ gestation (P = .01). Cord ZnPP/H values from insulin-dependent diabetic mothers were elevated compared with reference values. Changing the iron supplementation protocol was not associated with improved ZnPP/H measurements. Conclusions Cord blood and postnatal reference ranges for ZnPP/H are defined. Iron balance depends on a complex interaction of prenatal and postnatal factors. To refine the reference range for the zinc protoporphyrin–to–heme ratio (ZnPP/H) of preterm infants, we assessed the impact of maternal risk factors on ZnPP/H and evaluated the impact of changes in iron supplementation on iron status. The reference range for neonatal ZnPP/H was refined using prospective data from 31 reference infants ≤35 weeks’ postmenstrual age (PMA) plus retrospective data from 51 infants <30 weeks’ PMA, and 59 infants 30-40 weeks’ PMA. Cord blood and first week of life values were compared when both were available. The impact of maternal risk factors was assessed by examining prospectively collected ZnPP/H from 48 high-risk infants. The effect of changing iron supplementation guidelines was evaluated by retrospective chart review of serial ZnPP/H from 194 infants. Cord ZnPP/H was lower at 30-35 weeks’ gestation than at 24-26 weeks’ gestation (P = .01). Cord ZnPP/H values from insulin-dependent diabetic mothers were elevated compared with reference values. Changing the iron supplementation protocol was not associated with improved ZnPP/H measurements. Cord blood and postnatal reference ranges for ZnPP/H are defined. Iron balance depends on a complex interaction of prenatal and postnatal factors." @default.
• W2023453460 created "2016-06-24" @default.
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• W2023453460 date "2012-07-01" @default.
• W2023453460 modified "2023-10-05" @default.
• W2023453460 title "Zinc Protoporphyrin–to–Heme Ratios in High-Risk and Preterm Infants" @default.
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• W2023453460 doi "https://doi.org/10.1016/j.jpeds.2011.12.048" @default.
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