Match each neonatal clinical presentation of hyperbilirubinemia to its most likely underlying etiology.
- A 4-day-old exclusively breastfed neonate with 12% weight loss, decreased wet diapers, and unconjugated hyperbilirubinemia.Lactation failure (breastfeeding) jaundice
- A 14-day-old exclusively breastfed neonate with adequate weight gain, normal physical examination, and persistent unconjugated hyperbilirubinemia.Breast milk jaundice
- A 3-day-old formula-fed neonate with normal weight, normal physical examination, and mild unconjugated hyperbilirubinemia that resolves by day 7.Physiologic jaundice
- A 4-week-old neonate presenting with acholic (pale) stools, dark urine, hepatomegaly, and predominantly conjugated hyperbilirubinemia.Biliary atresia
- A 24-hour-old male neonate with a family history of anemia who develops rapid-onset unconjugated hyperbilirubinemia and bite cells on the peripheral blood smear.Glucose-6-phosphate dehydrogenase (G6PD) deficiency
Answer
The correct pairings align the patient's timing of onset, hydration status, and fraction of bilirubin (conjugated vs. unconjugated) with the pathophysiologic mechanism. Lactation failure jaundice presents early with dehydration; breast milk jaundice presents later in thriving infants; physiologic jaundice is mild and self-resolving by day 7; biliary atresia presents with conjugated hyperbilirubinemia and acholic stools; and G6PD deficiency presents with early hemolysis and bite cells.
Each specific clinical scenario accurately matches the classic pathophysiological presentation of the condition. Timing of onset, signs of adequate versus inadequate milk intake, and the presence of direct (conjugated) versus indirect (unconjugated) bilirubin are the definitive diagnostic discriminators.
Step-by-Step Solution
Key Concept
Differentiating neonatal hyperbilirubinemia requires integrating the timing of onset (first 24 hours vs. later), feeding adequacy (dehydration vs. thriving), and bilirubin fractionation (unconjugated vs. conjugated).