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| UWHC Lab Test Details | |
|---|---|
| Test Name | Urea Nitrogen, Urine, 24 Hour |
| Test Code(s) | HCUUREA, UUREA |
| CPT Code(s) | 84540 |
| Methodology | Urease |
| Testing Site | University Hospital |
| Days Performed | Daily, 24 hours. |
| In-Lab Turnaround Time | 4 hours. |
| Stat In-Lab Turnaround Time | 1 hour. |
| Collection Requirements | |||
|---|---|---|---|
| Specimen | 24 hour timed urine | ||
| Collection Container |
| ||
| Collection Instructions | Collect 24 hour urine. No preservative required. For timed urine collections, collect all urine in container provided. Add "Refrigerate" sticker to 24-hour container.
For 24-hour urine test the collection period must be within 22-26 hours. Collection period starts after first void of the period. It is very important to refrigerate specimen during and after the collection. Indicate the date and time collection started and date and time collection finished. If questions about collection process or container does not have instructions attached, call (608) 263-7060 for assistance.
Patient instructions available at www.uwhealth.org. Search for 24-hour urine collection or HF#4339. | ||
| Collection Volume | Entire collection | ||
| Specimen Processing Requirements | |||||||
|---|---|---|---|---|---|---|---|
| Stability |
| ||||||
| Sample Analyzed | Urine aliquot | ||||||
| Testing Volume | 1 mL | ||||||
| Pediatric Testing Volume | 0.4 mL | ||||||
| Outreach Specimen Processing | Mix urine well and note volume and period. Transport 50 mL aliquot on coolant pack to the laboratory along with volume and period information. | ||||||
| Specimen Transport | Transport entire specimen to the laboratory at close of collection. Transport with coolant pack if coming from clinic location. | ||||||
| Interpretation | |
|---|---|
| Reference Interval | 0 days and up: 12-20 g/24 hours
Results calculated only for collections of 22-26 hours. |
| Additional Information | Urine urea is usually used as an indicator of renal function. For nutritional assessment of nitrogen balance see Total Nitrogen, Urine. |
