Urea, 24 Hour, Urine
Use
This test is useful for assessing protein intake and nitrogen balance in patients. Urea, being the end product of protein metabolism, accounts for approximately 50% of urinary solutes and 90%-95% of total nitrogen excretion under normal conditions. The measurement of urea excretion over a 24-hour period can provide insights into the protein catabolic activity in the body and kidney function.
Special Instructions
The test requires a 24-hour urine collection. Ensure the complete urine volume and length of collection time is recorded. Use Sarstedt 5 mL Aliquot Tube (T914) for the specimen. Follow the guidance on urine preservatives for proper specimen transportation and storage.
Limitations
The test results may be influenced by factors such as glomerular filtration rate, dietary protein intake, protein catabolic rate, and hydration state. Therefore, these factors should be considered when interpreting the test outcome. There are no significant cautionary statements regarding improper collection or handling.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 48999-7
- 48999-7
- 13362-9
- 3167-4
- 63481-6
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
4 mL
Minimum Volume
1 mL
Container
Plastic, urine tube
Collection Instructions
Collect urine for 24 hours. Mix well before taking aliquot. See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Causes for Rejection
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 14 days |
| Frozen | 30 days |