Chart — Neonatal
Physiologic vs Pathologic Jaundice Chart
Most newborn jaundice is physiologic — but jaundice in the first 24 hours never is. The comparison below is built around the single highest-yield discriminator: timing.
Educational use only. Bilirubin management thresholds are set by nomogram and provider; report visible jaundice and risk factors rather than estimating severity by eye. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Physiologic vs Pathologic
| Feature | Physiologic Jaundice | Pathologic Jaundice |
|---|---|---|
| Onset | After 24 hours of life — typically day 2–3 | Within the first 24 hours of life |
| Cause | Immature liver conjugation + high newborn red cell turnover | Hemolysis (ABO/Rh incompatibility), sepsis, G6PD deficiency, cephalohematoma breakdown |
| Bilirubin pattern | Rises slowly, peaks day 3–5 (later in preterm), then falls | Rises fast — often more than 5 mg/dL per day — or exceeds nomogram thresholds |
| Duration | Resolves by 1–2 weeks (term) | Persists or progresses; conjugated fraction may be elevated |
| Infant appearance | Feeding and behaving normally | May be lethargic, feeding poorly, or showing signs of underlying illness |
| Action | Promote frequent feeding; monitor per protocol | Immediate provider notification; anticipate labs and phototherapy |
Patterns Worth Knowing
Breastfeeding (suboptimal-intake) jaundice — first week
Insufficient intake means fewer stools and more bilirubin reabsorption. The fix is more effective feeding — at least 8 to 12 times daily — and lactation support, not stopping breastfeeding.
Breast milk jaundice — after the first week
A benign, prolonged unconjugated jaundice in a thriving breastfed infant, peaking around weeks 2 and lingering. Diagnosis of exclusion made by the provider.
Kernicterus warning signs
Extreme lethargy, poor suck, high-pitched cry, arching (opisthotonos), and seizures signal acute bilirubin encephalopathy — a neurologic emergency.
NCLEX Pearls
- ✦Jaundice in the first 24 hours of life is pathologic until proven otherwise — report it immediately.
- ✦Jaundice progresses head to toe as levels rise; visible estimation is unreliable — measure (TcB/TSB) per protocol.
- ✦Frequent effective feeding is the best nursing intervention — bilirubin leaves in the stool.
- ✦Under phototherapy: eye shields on, maximum skin exposed, monitor temperature and hydration, and do not apply lotions.
- ✦Coombs-positive ABO incompatibility is the classic cause of early hemolytic jaundice on the NCLEX.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Academy of Pediatrics (AAP) · Neonatal Resuscitation Program (NRP) · AWHONN. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →