In This Section

Available Tests

  • BUN (Urea Nitrogen)

BUN (Urea Nitrogen)

Tube Type

Test ID   LAB140
EPIC Order
CPT Code(s)   84520
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station   Routine 30; STAT 888
Specimen Routine: 1 mL blood/serum separator tube/gold top/red/royal blue top acceptable
  micro: 200 µL blood/serum separator bullet/gold top/red top



 <6 hours

Room Temperature-24 hours
Refrigerated-5 days
Frozen-6 months

Availability 24 hours/day
Turnaround Time   STAT 1 hr., Routine 2 hrs.
Reference Range Normal:

see Table below

Reference ranges effective July 1997


 Reference Range:

Age mg/dL (Urea-N)
<1 yr 4-19
1-13 yr 5-17
14 yr + 7-21

Reviewed by Karen Hrischuk on December 13, 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