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HelpTest Code LAB4008 Urea, Random, Urine
Ordering Guidance
A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. See URCR / Uric Acid, 24 Hour, Urine.
Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Container/Tube: Plastic tube
Specimen Volume: 4 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Useful For
Assessment of kidney failure (prerenal vs acute kidney injury)
Method Name
Kinetic Ultraviolet Assay
Reporting Name
Urea, Random, USpecimen Type
UrineSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
No established reference values
Random urine urea may be interpreted in conjunction with serum urea, using both values to calculate fractional excretion of urea.
The calculation for fractional excretion (FE) of urea is
FE(U)= ([U(urine)XCreat(serum)]/[U(serum)XCreat(urine)]) X 100
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84540
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| URCON | Urea, Random, U | 3092-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| URCON | Urea, Random, U | 3092-4 |
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 day to 24 daysForms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.