Casandra
Casandra Test Code MC28059Version 1 (DRAFT)
Performing Lab
Urea, Random, Urine
Clinical Use
Order TestUse
Assessment of kidney failure (prerenal vs acute kidney injury), especially useful when fractional excretion of urea is calculated to distinguish prerenal azotemia from acute kidney injury.
Special Instructions
Not provided.
Limitations
Random urine collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24‑hour specimen, typically small children. No established reference values. All specimens will be evaluated for test suitability.
Test Details
FDA ApprovedNew York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Urea
AnalyteUrea
Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)
LOINC Codes
Order Codes
- 3092-4 - Urea Ur-mCnc
Result Codes
- 3092-4 - Urea Ur-mCnc
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Urine
Volume
4 mL
Minimum Volume
1 mL
Container
Plastic tube
Collection Instructions
Collect a random urine specimen. No preservative.
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 |