What bilirubin level range is expected at 24 hours of life?

What bilirubin level range is expected at 24 hours of life?

• A. 2-6 mg/dL
• B. 0-1 mg/dL
• C. 6-12 mg/dL
• D. 10-15 mg/dL

Answer: (A)

Newborn physiologic jaundice is caused by high bilirubin production combined with immature liver conjugation. In the first day of life, the liver isn’t fully able to conjugate bilirubin quickly, so unconjugated bilirubin rises gradually. By about 24 hours, a healthy term baby typically has a bilirubin level around 2 to 6 mg/dL. This range reflects the normal early rise before it peaks a day or two later. Levels much lower, like 0–1 mg/dL, would be unexpectedly low for this time frame, while levels in the higher ranges (6–12 mg/dL or 10–15 mg/dL) at 24 hours would suggest a need for closer assessment for possible pathologic causes or a quicker rise than expected.