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PEDIATRICS Vol. 108 No. 1 July 2001, pp. 31-39

Prediction of Hyperbilirubinemia in Near-Term and Term Infants

Received Jun 19, 2000; accepted Nov 13, 2000.

David K. Stevenson*, Avroy A. FanaroffDagger , M. Jeffrey Maisels§, Betty W. Y. Youngparallel , Ronald J. Wong*, Hendrik J. Vreman*, James R. MacMahon*, Chap Y. Yeung, Daniel S. Seidman#, Rena Gale#, William Oh**, Vinod K. BhutaniDagger Dagger , Lois H. JohnsonDagger Dagger , Michael Kaplan§§, Cathy Hammerman§§, and Hajime Nakamura||

From the * Department of Pediatrics, Lucile Salter Packard Children's Hospital, Stanford, California; Dagger  Department of Neonatology, Rainbow Babies' and Children's Hospital, Cleveland, Ohio; § Department of Pediatrics, William Beaumont Hospital, Royal Oak, Michigan; parallel  Department of Paediatrics, Pamela Youde Nethersole Eastern Hospital, Hong Kong, China;  Department of Paediatrics, Queen Mary Hospital/Tsan Yuk Maternity Hospital, Hong Kong, China; # Departments of Neonatology and Obstetrics and Gynecology, Bikur Cholim Hospital, Jerusalem, Israel; ** Department of Pediatrics, Women and Infants Hospital, Providence, Rhode Island, Dagger Dagger  Department of Pediatrics, Pennsylvania Hospital, Philadelphia, Pennsylvania; §§ Department of Neonatology, Shaare Zedek Medical Center, Jerusalem, Israel; and || Department of Pediatrics, University of Kobe, Kobe, Japan.

Objective.  The purpose of this study was to determine whether end-tidal carbon monoxide (CO) corrected for ambient CO (ETCOc), as a single measurement or in combination with serum total bilirubin (STB) measurements, can predict the development of hyperbilirubinemia during the first 7 days of life.

Methods.  From 9 multinational clinical sites, 1370 neonates completed this cohort study from February 20, 1998, through February 22, 1999. Measurements of both ETCOc and STB were performed at 30 ± 6 hours of life; STB also was measured at 96 ± 12 hours and subsequently following a flow diagram based on a table of hours of age-specific STB. An infant was defined as hyperbilirubinemic if the hours of age-specific STB was greater than or equal to the 95th percentile as defined by the table at any time during the study.

Results.  A total of 120 (8.8%) of the enrolled infants became hyperbilirubinemic. Mean STB in breastfed infants was 8.92 ± 4.37 mg/dL at 96 hours versus 7.63 ± 3.58 mg/dL in those fed formula only. The mean ETCOc at 30 ± 6 hours for the total population was 1.48 ± 0.49 ppm, whereas those of nonhyperbilirubinemic and hyperbilirubinemic infants were 1.45 ± 0.47 ppm and 1.81 ± 0.59 ppm, respectively. Seventy-six percent (92 of 120) of hyperbilirubinemic infants had ETCOc greater than the population mean. An ETCOc greater than the population mean at 30 ± 6 hours yielded a 13.0% positive predictive value (PPV) and a 95.8% negative predictive value (NPV) for STB >= 95th percentile. When infants with STB >95th percentile at <36 hours of age were excluded, the STB at 30 ± 6 hours yielded a 16.7% PPV and a 98.1% NPV for STB >75th percentile. The combination of these 2 measurements at 30 ± 6 hours (either ETCOc more than the population mean or STB >75th percentile) had a 6.4% PPV with a 99.0% NPV.

Conclusions.    This prospective cohort study supports previous observations that measuring STB before discharge may provide some assistance in predicting an infant's risk for developing hyperbilirubinemia. The addition of an ETCOc measurement provides insight into the processes that contribute to the condition but does not materially improve the predictive ability of an hours of age-specific STB in this study population. The combination of STB and ETCOc as early as 30 ± 6 hours may identify infants with increased bilirubin production (eg, hemolysis) or decreased elimination (conjugation defects) as well as infants who require early follow-up after discharge for jaundice or other clinical problems such as late anemia. Depending on the incidence of hyperbilirubinemia within an institution, the criteria for decision making should vary according to its unique population.  Key words:  carbon monoxide, end-tidal carbon monoxide, hemolysis, hyperbilirubinemia, neonatal jaundice, prediction, serum total bilirubin.




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