Newborn Jaundice and Phototherapy on the NCLEX
Physiologic vs pathologic jaundice, kernicterus risk, and the phototherapy nursing care checklist.
One timing rule separates normal from dangerous jaundice, and phototherapy care is a checklist NCLEX pulls from directly.
Physiologic vs pathologic
Physiologic jaundice appears after 24 hours of life, peaks around days 3-5, and resolves without harm in most term infants. Cause: immature liver conjugation plus normal red cell breakdown. Pathologic jaundice appears within the first 24 hours or climbs rapidly. Causes: Rh or ABO incompatibility (hemolysis), sepsis, cephalohematoma resorption. Jaundice in the first day is always reported and worked up.
Why it matters: kernicterus
Unconjugated bilirubin crosses the blood-brain barrier at high levels and deposits in the basal ganglia. Early signs of acute bilirubin encephalopathy: lethargy, poor feeding, high-pitched cry, then hypertonia and arching. Kernicterus is the permanent injury. Treatment thresholds come from hour-specific nomograms, which is why bilirubin is always interpreted against age in hours.
Phototherapy nursing care
Light converts skin bilirubin to a water-soluble form excreted in bile and urine. Cover the eyes with shields; remove them at feeds to check the eyes and allow bonding. Maximize exposed skin: diaper only. Reposition regularly for even exposure. Monitor temperature (both overheating and cold stress are risks) and hydration: feed every 2-3 hours, count wet diapers and stools. No lotions or ointments on exposed skin. Expect loose green stools; protect the skin. Follow serial bilirubin levels.
Breastfeeding-associated patterns
Breastfeeding (suboptimal-intake) jaundice, first week: not enough milk transfer → fewer stools → more bilirubin reabsorbed. Fix the feeding: lactation support, feed 8-12 times per day. Breast milk jaundice, appearing later (after the first week) and lingering: related to factors in the milk itself in a thriving infant. Managed with monitoring; breastfeeding usually continues per the provider.
Frequently asked
Jaundice noticed at 18 hours of life. Normal?
No. Under 24 hours is pathologic until proven otherwise, most often hemolysis from blood group incompatibility. Bilirubin level and Coombs testing come next.
Can the baby come out from under the lights to breastfeed?
Yes, for feeds, with the eye shields off during the break. Feeding drives bilirubin excretion, so feeds are part of the treatment, not an interruption.
Why does a cephalohematoma raise jaundice risk?
The trapped blood breaks down and releases bilirubin as it resorbs, adding to the load on an immature liver.
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