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Bilirubin (Neonatal)

Blood Sciences Test


Serum (Paed tube)

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Reference Range

Reference ranges for neonatal bilirubin (conjugated + unconjugated) :

Age Premature (µmol/L) Full term (µmol/L)
Up to 24 h 17 – 140 34 – 100
Up to 48 h 102 – 204 100 – 170
3 – 5 days 170 – 240 70 – 140

Greater than 1 month —> adult :

  • Conjugated 0 – 5.0 µmol/L
  • Total <21.0 µmol/L

Test Usage

The method employed for neonatal bilirubin measures conjugated and total bilirubin, and may be used on neonates up to the age of 14 – 21 days.

After this time significant amounts of conjugated-bilirubin are formed, which renders this simple relationship invalid.

The danger level for development of kernicterus is believed to be 320 µmol/L of unconjugated bilirubin. However, any result greater than 250 µmol/L should be regarded as a warning and the baby should be monitored carefully.

Charts depicting the action levels for exchange transfusion under various clinical conditions, compiled by the staff in the Neonatal Unit, are available.

Turnaround Time

1 day


Local test

Cannot be added on to an existing request – due to artefactual increase in conjugated bilirubin.

Specimen Labelling Procedure
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