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HelpTest Code BUN Urea Nitrogen
Useful For
Urea nitrogen measurements are used in the diagnosis and treatment of certain renal and metabolic diseases.
Synonyms/Keywords
BUN, Blood Urea Nitrogen, i-Stat BUN
Specimen Requirements
| Fasting Required | Specimen Type |
Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No |
Plasma/Serum |
Lithium-heparin Plasma Separator (PST), Serum Separator Tube (SST) | Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT) | 1 mL | 0.5 mL | 0.5 mL whole blood |
Collection/Processing Instructions
Samples collected in a RTT or GTT must be removed from cells within one hour for storage or transport.
Samples collected in gel barrier tubes must be removed from the primary tube prior to transporting to Marshfield.
Do not send the primary collection tube.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma/Serum | Ambient | 5 days |
| Refrigerated | 7 days | |
| Frozen | 3 months |
Rejection Criteria
Specimens in ammonium heparinate or oxalate
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| All Performing Sites |
0-1 year: 1-14 mg/dL 2 - 17 years: 5-20 mg/dL ≥18 years: 6-24 mg/dL |
| See Critical Value Policy for list of current critical values. | |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Beaver Dam | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Chippewa Falls | Monday through Friday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Weston | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Eau Claire | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Park Falls | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Ladysmith | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Rice Lake | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Marshfield | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Minocqua | Monday through Sunday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Neillsville | Monday through Friday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Stevens Point | Monday through Friday | Less than 2 hours | Urease GLDH Rate Assay/Beckman AU |
| Wisconsin Rapids | Monday through Friday | Less than 2 hours | Biochromatic Rate Technique/Siemens Dimension |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84520 | 1 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 84520 | 1 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Blood Urea Nitrogen |