A 36-hour-old term breastfed infant develops visible jaundice. Total serum bilirubin is 16.5 mg/dL with a direct fraction of 0.6 mg/dL. The maternal blood group is O-positive, and the infant is A-positive with a strongly positive direct Coombs test. What is the most appropriate initial therapy?

Answer and explanation

Correct answer: B. Initiate intensive phototherapy and monitor bilirubin every 4 to 6 hours

  1. Step 1: The infant has ABO hemolytic disease with rapid indirect hyperbilirubinemia.
  2. Step 2: According to AAP neonatal hyperbilirubinemia guidelines, total serum bilirubin of 16.5 mg/dL at 36 hours exceeds the phototherapy threshold for hemolytic neurotoxicity risk.
  3. Step 3: Intensive phototherapy (irradiance >= 30 uW/cm2/nm in the blue-green spectrum) converts unconverted bilirubin into water-soluble photoisomers (lumirubin) excreted without conjugation.
Answer
Initiate intensive phototherapy and monitor bilirubin every 4 to 6 hours.
Why not the others: 'Perform emergency double-volume exchange transfusion' is reserved for bilirubin levels exceeding exchange thresholds (typically > 20 mg/dL) or signs of acute bilirubin encephalopathy; 'Discontinue breastfeeding permanently' is unnecessary and harmful; 'Administer oral phenobarbital' has too slow an onset and adverse neurobehavioral effects.

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