Overview
Why Timing and Trend Matter
Jaundice is common in newborns, but the yellow colour alone does not tell you whether bilirubin is safe.
Jaundice is common in newborns, but the yellow colour alone does not tell you whether bilirubin is safe. The nurse's first clinical questions are: When did it begin? How quickly is the bilirubin changing? Can this infant clear bilirubin effectively? Age in hours, gestational age, risk factors, feeding, and neurologic findings answer those questions. Unconjugated bilirubin can cross the blood-brain barrier and injure vulnerable brain tissue. That is why jaundice in the first 24 hours, a rapidly rising bilirubin, or a change in feeding or tone deserves more urgency than uncomplicated jaundice appearing after the first day. Phototherapy lowers neurotoxicity risk by changing bilirubin into water-soluble photoproducts that can be excreted without normal hepatic conjugation. The overview below distinguishes the patterns; the treatment decision then comes from the hour-specific serum bilirubin threshold.