Laboratory Services

Updated Test Information:

Test Description
BUN
Synonym(s)
BUN, Urea, Urea Nitrogen
Test ID
BUN
General Information
Determination of blood urea nitrogen is the most widely used screening test for renal function. When used in conjunction with serum creatinine determinations it can aid in the differential diagnosis of the three types of azotemia: prerenal, renal and postrenal.
Specimen Type
Serum
Alternate Specimen Type
Red, Li-heparin plasma, K2EDTA
Specimen Requirements
SST
Specimen Collection / Processing Instructions
SST - Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
Additional Processing Details
Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
Stability
7 days at 20-25 ˚C
7 days at 4-8 ˚C
1 yr at -20 ˚C
Unacceptable Specimen Conditions
Ammonia heparin tubes
Methodology
Kinetic/Enzymatic (urease)
Estimated TAT
0-2 days
Testing Schedule
Monday-Saturday
CPT Code(s)
84520
Minimum Sample Volume
Preferred volume 1mL
Pediatric Min. Volume (if applicable)
500 uL
Reference Range
Infants < 1 yr: 4 - 19 mg/dl
Infants/Children: 5 - 18 mg/dl
Adult 18-60y: 6 - 20 mg/dL
Adult >60y: 8 - 23 mg/dL
Performing Lab
Incyte Diagnostics
LOINC Code(s)
3094-0