Urea Nitrogen and Creatinine Profile, 24-Hour Urine

Also known as: Creatinine and Urea, 24-Hour Urine, Urine Creatinine, Urine Urea Nitrogen

Clinical Use

Order Test

Use

Renal function test

Special Instructions

Not provided.

Limitations

This test is limited to the measurement of urea nitrogen and creatinine concentration in a 24-hour urine sample. Factors such as incomplete urine collection, dehydration, or excessive fluid intake can affect the accuracy of the test results. Additional tests may be needed for a comprehensive evaluation of renal function.

Test Details

Methodology

Automated Analyzer (Clinical Chemistry)

Biomarkers

Creatinine, Urine

Analyte

Creatinine

Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

Urea Nitrogen, Urine

Analyte

Urea Nitrogen

Concentration / Level • Quantitative (Continuous) (e.g., copies/mL, % expression)

LOINC Codes

Order Codes

81232-1 - Supersaturation Pnl 24h Ur

Result Codes

2161-8 - Creat Ur-mCnc
2162-6 - Creat 24h Ur-mRate
3095-7 - UUN Ur-mCnc
3096-5 - UUN 24h Ur-mRate

Result Turnaround Time

1 day

Specimen

Urine

Volume

10 mL aliquot of entire collection

Minimum Volume

1 mL aliquot

Container

Plastic urine container, no preservative

Collection Instructions

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 (8 AM 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.