A nursery disinfectant change is suspected to cause hyperbilirubinemia; which agent should be suspected?

• A. Phenolic
• B. Quaternary ammonium
• C. Bleach
• D. Alcohol

Answer: (A)

Phenolic disinfectants can cause hyperbilirubinemia in newborns because phenol can bind strongly to albumin and displace bilirubin from its albumin-binding sites. In a neonate, most bilirubin is unconjugated and relies on albumin binding for safe transport. When more free bilirubin is released, it can accumulate, and with the infant’s immature liver conjugation and developing blood-brain barrier, there's a greater risk that bilirubin will deposit in tissues, potentially leading to serious bilirubin-related toxicity. Because of this mechanism, a nursery cleaner containing phenol is a plausible cause of increased bilirubin in a newborn. Other common cleaners—bleach, quaternary ammonium compounds, and alcohol—do not have the same direct link to displacing bilirubin from albumin in this context, so they’re less likely culprits here.