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HelpTest ID URCON 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.
Secondary ID
614061Useful For
Assessment of kidney failure (prerenal vs acute kidney injury)
Specimen Type
UrineSpecimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| 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
CPT Code Information
84540
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.