Creatinine, 24 Hour, Urine
Use
Urinary creatinine, in conjunction with serum creatinine, is used to calculate the creatinine clearance, which is a measure of renal function. This test is useful for normalizing urinary analytes to account for variation in urinary concentration. It provides an estimate of the glomerular filtration rate, which is valuable for diagnosing and monitoring renal health and dysfunction.
Special Instructions
Not provided.
Limitations
The reliability of 24-hour urinary creatinine determinations depends on accurately collected 24-hour specimens. Variability in results can arise from differences in muscle mass or meat intake. Some substances, including rifampicin, levodopa, and certain therapeutic concentrations, can interfere with accuracy, leading to falsely low or high creatinine results.
New York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Creatinine
Analyte
LOINC Codes
- 65634-8 - Creatinine 24H UR pnl 24h Ur
- 2162-6 - Creat 24h Ur-mRate
- 20624-3 - Creat 24h Ur-mCnc
- 13362-9 - Specimen collect Time Ur
- 3167-4 - Specimen vol 24h Ur
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
Not provided
Minimum Volume
1 mL
Collection Instructions
24-hour urine collection required; temperature control or preservative must be applied within 4 hours of completion of collection.
Causes for Rejection
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 30 days |
| Frozen | 30 days |