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BUN (Blood Urea Nitrogen)

Tube Type = Mint Green Plasma Separator Tube

Tube Type

Test ID LAB140
EPIC Order BUN
CPT Code(s) 84520
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station Routine 30; STAT 888
Specimen Routine: 1 mL blood/green lithium heparin tube. Also acceptable gold SST, orange SST, or red tube
Micro: 200 µL blood/mint green top bullet/gold top/red top
Stability Unspun: <6 hours
Spun/Separated,
Room Temp:		 3 days
Spun/Separated,
Refrigerated:		 7 days
Frozen: 30 days
Availability 24 hours/day
Turnaround Time STAT 1 hr., Routine 2 hrs.
Reference Range Normal: 9-23 mg/dL
Comments Reference ranges effective 7/13/2021

Reviewed by J. Carr on January 10, 2026

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