Urea Nitrogen, Serum
Test Code
BUN
Description
Collect
Plain red top or SST tube.
Specimen Preparation
Onsite [NJH]: Transport to lab within 1 hour.
Offsite: Separate serum from cells within 2 hours by centrifuge and aliquot into a labeled polypropylene or similar plastic tube.
Preferred volume: 1 mL serum
Pediatric Collection
Minimum volume: 100 mcL serum
Storage Transport Temp
Offsite: Frozen. Send serum Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability
Stability after cell separation:
8 hours at room temperature
24 hours refrigerated at 2-8°C
>24 hours frozen at -20°C
Performed
Monday - Friday
Methodology
Urease Enzymatic
Reported
4 hour routine, 1 hour STAT
Department
Core LabSynonyms
Urease Enzymatic (Urea Nitrogen, Serum);BUNX
Reference Interval
Urea Nitrogen, Serum |
Human |
|
Male |
Female | |
mg/dL |
||
Newborn - 5 years |
5-27 |
5-27 |
6 years - 15 years |
7-22 |
7-22 |
16+ years |
8-22 |
8-22 |
CPT Code
84520