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HelpTest Code LAB140 Blood Urea Nitrogen (BUN)
Useful For
Evaluating kidney function. Elevations are seen in inadequate renal perfusion, shock, diminished blood volume, chronic nephritis, nephrosclerosis, tubular necrosis, glomerular nephritis and urinary tract obstruction. Transient elevations may also be seen during periods of high protein intake. Unpredictable levels occur with liver diseases.
Methodology
Urease GLDH
Performing Laboratory
Bozeman Health Laboratory Services
Specimen Requirements
Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL
Specimen Transport Temperature
Ambient/Refrigerated
Specimen Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma or Serum | Ambient | 7 days |
| Refrigerated | 7 days | |
| Frozen | 1 year |
Reference Values
| Age Break | Normal Range |
|---|---|
| <1 year | 4-19 mg/dL |
| 1 year to <18 years | 5-18 mg/dL |
| ≥18 years to <60 years | 6-20 mg/dL |
| ≥60 years | 8-23 mg/dL |
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84520