Test Details
Methodology
Enzymatic (urease)
Result Turnaround Time
Within 1 day
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Test Includes
Blood urea nitrogen; urine clearance; urine urea nitrogen
Use
Renal function test
Special Instructions
Must be a timed collection.
Specimen Requirements
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 (Note: This volume does not allow for repeat testing.)
Container
Gel-barrier tube or transport tube and plastic urine container
Collection Instructions
Serum must be drawn during urine collection. Separate serum from cells within 45 minutes of collection.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 14 days |
Refrigerated | 14 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x3 |
Storage Instructions
Maintain specimen at room temperature.
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 002329 | Urea Nitrogen Clearance | 81232-1 | 001040 | BUN | mg/dL | 3094-0 |
| 002329 | Urea Nitrogen Clearance | 81232-1 | 135301 | Urea Clearance | mL/min | 3098-1 |
| 002329 | Urea Nitrogen Clearance | 81232-1 | 013508 | Urea Nitrogen, U | mg/dL | 3095-7 |
| 002329 | Urea Nitrogen Clearance | 81232-1 | 013236 | Urea Nitrogen, 24hr | g/24 hr | 3096-5 |
| Order Code | 002329 | |||||
| Order Code Name | Urea Nitrogen Clearance | |||||
| Order Loinc | 81232-1 | |||||
| Result Code | 001040 | |||||
| Result Code Name | BUN | |||||
| UofM | mg/dL | |||||
| Result LOINC | 3094-0 | |||||
| Order Code | 002329 | |||||
| Order Code Name | Urea Nitrogen Clearance | |||||
| Order Loinc | 81232-1 | |||||
| Result Code | 135301 | |||||
| Result Code Name | Urea Clearance | |||||
| UofM | mL/min | |||||
| Result LOINC | 3098-1 | |||||
| Order Code | 002329 | |||||
| Order Code Name | Urea Nitrogen Clearance | |||||
| Order Loinc | 81232-1 | |||||
| Result Code | 013508 | |||||
| Result Code Name | Urea Nitrogen, U | |||||
| UofM | mg/dL | |||||
| Result LOINC | 3095-7 | |||||
| Order Code | 002329 | |||||
| Order Code Name | Urea Nitrogen Clearance | |||||
| Order Loinc | 81232-1 | |||||
| Result Code | 013236 | |||||
| Result Code Name | Urea Nitrogen, 24hr | |||||
| UofM | g/24 hr | |||||
| Result LOINC | 3096-5 |