How do you differentiate physiologic jaundice from pathologic jaundice in newborns?

• A. Physiologic jaundice appears after 24 hours and peaks around days 3-5; pathologic jaundice presents earlier, lasts longer, or with marked hyperbilirubinemia or hemolysis.
• B. Pathologic jaundice appears after 24 hours and peaks around day 3-5.
• C. Physiologic jaundice lasts longer and is associated with hemolysis.
• D. Pathologic jaundice resolves within 72 hours.

Answer: (A)

Distinguishing physiologic from pathologic jaundice in newborns is all about the pattern of rise and fall of bilirubin: when it starts, how high it climbs for the baby’s age, and how long it lasts, plus whether there are signs of an underlying problem such as hemolysis.

Physiologic jaundice is the normal, benign pattern. It typically starts after about 24 hours of life, usually appears on day 2 or 3, peaks around days 3–5, and then gradually resolves over the first week or two in term babies. It reflects the newborn’s immature liver ability to conjugate bilirubin and a higher rate of bilirubin production, and it does not involve significant hemolysis.

Pathologic jaundice, by contrast, starts earlier than 24 hours, or rises very rapidly, may reach high bilirubin levels for the newborn’s age, and tends to persist longer than the usual 1–2 weeks in term infants (often longer in preterm babies). It may be accompanied by signs of hemolysis or other problems such as infection, liver disease, or metabolic disorders, which prompts further workup and sometimes treatment.

So the best pattern to differentiate them is that physiologic jaundice appears after 24 hours and peaks around day 3–5, while pathologic jaundice presents earlier or persists longer, often with higher bilirubin or signs of hemolysis.