Laboratory Services
BUN
Print this pageUpdated Test Information:
| Test Description |
BUN
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|---|---|---|
| Synonym(s) |
BUN, Urea, Urea Nitrogen
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| Test ID |
BUN
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| 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.
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| Specimen Type |
Serum
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| Specimen Requirements |
SST
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| Alternate Specimen Type |
Red, Li-heparin plasma, K2EDTA
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| 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.
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| Minimum Sample Volume |
Preferred volume 1mL
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| Pediatric Min. Volume (if applicable) |
500 uL
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| 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.
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| Stability |
7 days at 20-25 ˚C
7 days at 4-8 ˚C 1 yr at -20 ˚C |
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| Unacceptable Specimen Conditions |
Ammonia heparin tubes
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| Methodology |
Kinetic/Enzymatic (urease)
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| Estimated TAT |
0-2 days
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| Testing Schedule |
Monday-Saturday
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| CPT Code(s) |
84520
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| 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 |
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| Performing Lab |
Incyte Diagnostics
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| LOINC Code(s) |
3094-0
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