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Bilirubin Subfractions

Includes Bilirubin, Conjugated (Bc) and Bilirubin, Unconjugated (Bu)

Tube Type

Test ID LAB5140
EPIC Order
CPT Code(s) 82248
Group/Individual Test Group
Laboratory Core
Tube Station Routine 30; STAT 888
Specimen Routine: 1 ml blood/serum separator tube/gold top/red top acceptable
micro: 200 µl blood/serum separator bullet/gold top/red top
Stability Unspun:
4 hours
Room Temperature: 4 hours
Refrigerator: 7 days
Frozen: 6 months
Availability Routine: 24 hrs/day
Turnaround Time STAT 1 hr., Routine 2 hrs.
Reference Range Bc Conjugated
Age Reference Range (mg/dL)
0-14 days ≤0.6
15+ days ≤0.1
Bu Unconjugated
Age Reference Range (mg/dL)
0-1 days ≤5.8
1-2 days ≤8.2
3-5 days ≤11.7
6 days - 1 month Variable
1+ months


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If patient age <15 days, recommend Neonatal Bilirubin.

Reviewed by Christopher Parker on December 16, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514