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  • Title: Predictive value of cord blood bilirubin for hyperbilirubinemia in neonates at risk for maternal-fetal blood group incompatibility and hemolytic disease of the newborn.
    Author: Calkins K, Roy D, Molchan L, Bradley L, Grogan T, Elashoff D, Walker V.
    Journal: J Neonatal Perinatal Med; 2015; 8(3):243-50. PubMed ID: 26518407.
    Abstract:
    OBJECTIVE: To determine the predictive ability of cord blood bilirubin (CBB) for hyperbilirubinemia in a population at risk for maternal-fetal blood group incompatibility and hemolytic disease of the newborn. STUDY DESIGN: This is a single center retrospective case-control study. Cases received phototherapy; controls did not. Cases were matched 1:3 to controls by gender and treating physician. Inclusion criteria included: ≥35 weeks gestation, CBB, and one or more total serum bilirubin (TSB) concentrations. The primary outcome was CBB. Secondary outcomes were a TSB >75th percentile, length of stay, and neonatal intensive care unit admission. The prognostic ability of CBB for phototherapy and TSB >75th percentile was assessed using area under the receiver operating characteristic (ROC) curve. Logistic regression analyses were performed to determine predictors for phototherapy and TSB >75th percentile. RESULT: When compared to controls (n = 142), cases (n = 54) were more likely to have a positive Coombs' test (82% vs. 41% , p <  0.001) and TSB >75th percentile (85% vs. 21% , p <  0.001). When compared to controls, cases had a higher mean (±SD) CBB (2.5 ± 0.5 vs. 1.8 ± 0.4 mg/dL, p <  0.001). The area under the ROC curve (±SEM) for CBB for phototherapy and TSB >75th percentile was 0.87 ± 0.03 (p <  0.001, 95% CI 0.82, 0.93) and 0.87 ± 0.03 (p <  0.001, 95% CI 0.82, 0.92), respectively. CONCLUSION: In this study, the mean CBB concentration was higher in neonates who received phototherapy compared to those who did not. CBB concentrations may help predict severe hyperbilirubinemia and phototherapy in a population at risk for hemolytic disease of the newborn.
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