Urea Nitrogen and Creatinine Profile, 24-Hour Urine

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Turnaround Time: Within 1 day
CPT Code:

82570, 84540

Test Type: 10 mL aliquot, Urine (24-hour)
Stability Time:



Room temperature

7 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Reference Range:

Creatinine, Ur 24hr mg/24 hr 1000 - 2000
Urea Nitrogen, U mg/dL Not Estab.
Urea Nitrogen, 24hr g/24 hr 5 - 22


Renal function test.

Collection Details:

Collection Instructions:

State total 24-hour urine volume on the request form.

Plastic urine container, no preservative.

Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine, including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the following morning). Fasten the lid securely. The container must be labeled with the patient's full name, the date and time the collection began, and the date and time collection ended.

Room temperature.