Urea Nitrogen Clearance
| Urea Nitrogen Clearance | | | |
| Number | | 002329 |
| CPT | | 84545 |
| Related Information | | Urine Testing: Preservative Quick Reference Chart |
| Synonyms | | Urea Clearance ; UUN Clearance |
| Test Includes | | Blood urea nitrogen; urine clearance; urine urea nitrogen |
| Special Instructions | | Must be a timed collection. |
| Specimen | | Serum and urine (24-hour) |
| Volume | | 1 mL serum and 10 mL urine aliquot |
| Minimum Volume | | 0.5 mL serum and 1 mL urine aliquot |
| Container | | Gel-barrier tube or transport tube and plastic urine container |
| Collection | | Serum must be drawn during urine collection. Separate serum from cells within 45 minutes of collection. |
| Storage Instructions | | Maintain specimen at room temperature. Refrigerate urine. |
| Use | | Renal function test |
| Methodology | | Enzymatic (urease) |
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