In neonatal hyperbilirubinemia, when is exchange transfusion indicated?

• A. Exchange transfusion is reserved for severe hyperbilirubinemia or signs of acute bilirubin encephalopathy, based on gestational age and hours.
• B. Phototherapy is never effective.
• C. Exchange transfusion is first-line for all elevated bilirubin.
• D. Exchange transfusion should be performed only if bilirubin level exceeds 30 mg/dL.

Answer: (C)

Exchange transfusion is a high‑risk, last‑line therapy used for the babies most at risk from bilirubin toxicity. It is not the go-to treatment for every elevation. The decision hinges on how advanced the bilirubin is and how far along the infant is in gestation and postnatal life. In practice, most newborns with elevated bilirubin are managed with phototherapy; exchange transfusion is reserved for severe hyperbilirubinemia or when there are signs of acute bilirubin encephalopathy, such as lethargy, poor feeding, hypotonia, fever, high-pitched cry, or seizures.

The thresholds for performing an exchange transfusion vary with gestational age and postnatal age, because bilirubin kinetics and brain vulnerability differ by maturity. It’s not defined by a single fixed level for all babies (for example, a universal cutoff like 30 mg/dL does not apply across all ages and maturities). The goal is to intervene before bilirubin reaches levels that could cause neurotoxicity, while weighing the risks of the procedure itself.