Abstract
Objective:
To evaluate predischarge transcutaneous bilirubin (TcB) measurements combined with risk factors as predictors of the risk of a subsequent total serum bilirubin (TSB) ⩾17 mg per 100 ml (291 μmol l−1).
Study Design:
Routine TcB measurements are obtained daily for all infants in our well baby nursery. We performed a nested case–control study comparing all 75 infants who had been readmitted with TSB ⩾17 mg per 100 ml (291 μmol l−1) between 1 February 2005 and 28 February 2007 with randomly selected controls that had not been readmitted.
Result:
Between 1 February 2005 and 28 February 2007, 11 456 infants were discharged from the well baby nursery. Seventy-five infants (0.65%) were readmitted at a mean age of 110±29.9 h with a TSB⩾17 mg per 100 ml (291 μmol l−1). All received phototherapy. Using logistic regression analysis, three variables were statistically significant for predicting cases: the maximum predischarge TcB percentile group (P<0.0001, adjusted odds ratio (AOR), >95th percentile 148; 95% confidence interval (CI) 21 to >999, AOR 76 to 95th percentile 15; 95% CI 3.1 to 70, AOR 50 to 75th percentile 6.1; 95% CI 1.3 to 28 compared with <50th percentile), exclusive breastfeeding (P<0.0001, AOR 11; 95% CI 3.7 to 34) and gestational age (P=0.0057, AOR 35 to 36 6/7 week 21; 95% CI 2.3 to 185, AOR 37 to 37 6/7 week 15; 95% CI 1.9 to 115, AOR 38 to 38 6/7 week 1.8; 95% CI 0.3 to 11, AOR 39 to 39 6/7 week 1.1; 95% CI 0.2 to 7 AOR ⩾41 week 0.88; 95% CI 0.1 to 10 compared with 40 to 40 6/7 week infants). These three variables provided the best prediction of a case (c=0.885, area under the receiver operating characteristic curve) and this prediction was significantly better than the use of the clinical risk factors, gestation and exclusive breastfeeding, alone (c=0.770, P<0.001) or the TcB percentile grouping alone (c=0.766, P<0.001). Substituting the TcB rate of rise (c=0.903, P=0.316) or the last measured TcB (c=0.873, P=0.292) for the maximum TcB measurement did not significantly improve the predictors of a case.
Conclusion:
Combining predischarge TcB levels with two clinical risk factors—gestational age and exclusive breastfeeding—significantly improves the prediction of subsequent hyperbilirubinemia.
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Maisels, M., DeRidder, J., Kring, E. et al. Routine transcutaneous bilirubin measurements combined with clinical risk factors improve the prediction of subsequent hyperbilirubinemia. J Perinatol 29, 612–617 (2009). https://doi.org/10.1038/jp.2009.43
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DOI: https://doi.org/10.1038/jp.2009.43
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