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HelpTest Code NITU Nitrogen, Total, 24 Hour, Urine
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube
Specimen Volume: 10 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. No preservative. Refrigerated is the preferred preservation method.
Specimen Stability Information: Frozen 3 years
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections
Useful For
Assessing nutritional status (protein malnutrition)
Assessment of protein nutrition and nitrogen balance in hospitalized patients
Evaluating protein catabolism
Determining nitrogen balance, when used in conjunction with 24-hour fecal nitrogen measurement
Special Instructions
Method Name
Dumas Combustion
Reporting Name
Nitrogen, Total, USpecimen Type
UrineSpecimen Minimum Volume
2 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 7 days | |
| Ambient | 7 days | ||
| Frozen | |||
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
<16 years: Not established
≥16 years: 4-20 g/24 hours
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
84999
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| NITU | Nitrogen, Total, U | 2660-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 17418 | Nitrogen, Total, U | 2660-9 |
| DUR8 | Collection Duration | 13362-9 |
| TOTV | Specimen Volume | 28009-9 |
Day(s) Performed
Friday