Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
Neonatal jaundice and bilirubin treatment thresholds
Essential points for quick revision.
2 min synopsisUK scopeSources checked 27 Aug 2026Clinical review pending
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Jaundice in the first 24 hours or acute bilirubin encephalopathy
Visible jaundice before 24 hours is pathological until assessed, while lethargy, poor feeding, abnormal tone, high-pitched cry, apnoea, opisthotonus or seizures can indicate bilirubin neurotoxicity.
Action: Measure serum bilirubin within 2 hours for jaundice in the first 24 hours and obtain urgent medical review. Plot the result on the exact NICE gestation- and age-in-hours treatment chart, investigate haemolysis and infection, and start intensified phototherapy or arrange exchange transfusion when the relevant threshold or clinical encephalopathy indication is met. Do not wait for visible colour to worsen.
Synopsis
Assess jaundice by postnatal age and gestation, identify pathological and conjugated hyperbilirubinaemia, apply the correct NICE treatment graph or table, and prevent bilirubin encephalopathy without unnecessary treatment.
Jaundice reflects bilirubin deposition. Most newborn jaundice is unconjugated and transient, but timing, trajectory and the baby's condition determine risk.
Never use one universal bilirubin number: plot serum bilirubin against exact age in hours on the NICE graph or table for the baby's gestational age.
For jaundice before 24 hours, measure serum bilirubin within 2 hours and repeat every 6 hours until below the treatment threshold and stable or falling.
Key red flags
Visible jaundice before 24 hours requires urgent serum bilirubin measurement and medical review because haemolysis, infection and other pathology are more likely.
Investigation priorities
01
First-line: bilirubin measurementFirst stepFirst line
Quantify jaundice and determine treatment against the correct age- and gestation-specific threshold.
02
Reference standard: serum bilirubin plotted on the NICE treatment graph or tableReference standard
Decide phototherapy, intensified phototherapy, monitoring and exchange-transfusion action.
Management branches
Before 24 hoursUrgent pathological-jaundice pathway
Visible jaundice appears in the first day.
Measure serum bilirubin within 2 hours and arrange urgent medical review.
Plot the value against exact age and gestation and investigate haemolysis, sepsis and other causes.
Key medicines
Intravenous human normal immunoglobulin500 mg/kg intravenously over 4 hours as an adjunct to continuous intensified phototherapy for Rh or ABO haemolytic disease when serum bilirubin continues rising faster than 8.5 micromol/L/hour. Use the selected product's neonatal infusion protocol.
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.