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- W2031330585 abstract "A 54-day-old infant of Asian descent presented with jaundice. He first started appearing yellow a few weeks after birth. His pediatrician initially recommended increasing sunlight exposure. At subsequent visits, the pediatrician recommended stopping breastfeeding. Despite these interventions, the infant's jaundice persisted and his stools became pale. At 52 days of life (DoL),3 he had a serum bilirubin measured, and the reported “Bilirubin, Direct” concentration of 5.54 mg/dL (reference interval, 0.0–0.4 mg/dL) prompted an immediate referral (see Table 1 for a summary of laboratory results).View this table:Table 1. Summary of fractionated bilirubin results.The infant's physical examination and evaluation results were most consistent with biliary atresia (BA). He had marked jaundice, with a reported “Bili Conjugated” of 4.7 mg/dL (reference interval, 0.0–0.2 mg/dL), as well as increased aspartate aminotransferase, alanine aminotransferase, and γ-glutamyltransferase activities. He otherwise appeared well and had 2 newborn screens with results within reference intervals, making infectious or metabolic etiologies unlikely. Furthermore, protease inhibitor typing, chest radiograph, and abdominal ultrasound revealed no abnormalities, arguing against other liver-associated causes such as α1-antitrypsin disease, Alagille syndrome, and choledochal cyst.There was one laboratory result, however, that was inconsistent with BA: his newborn conjugated bilirubin concentration, reported as “Neonatal Dbil.” In our experience, infants with BA have newborn direct or conjugated bilirubin concentrations that exceed their birth hospital's derived reference interval (1). In contrast, this infant had a reported “Neonatal Dbil” concentration of 0.5 mg/dL on DoL 1, which was within the birth hospital's reported reference interval of 0.0–0.6 mg/dL. The bilirubin was measured using a Vitros analyzer, and the reference interval was derived by the manufacturer based on “40 apparently healthy neonates” (2).### QUESTIONS TO CONSIDER1. What is the difference between “Neonatal Dbil,” “Bilirubin, Direct,” and “Bili Conjugated”?2. How should reference intervals be established?3. Why are the reference intervals for the 3 …" @default.
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- W2031330585 date "2015-02-01" @default.
- W2031330585 modified "2023-09-26" @default.
- W2031330585 title "An Infant with Persistent Jaundice and a Normal Newborn Direct Bilirubin Measurement" @default.
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- W2031330585 doi "https://doi.org/10.1373/clinchem.2014.223115" @default.
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