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Test Code UUN24 Urea Nitrogen, Urine, LAB449

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: 24-hour urine collection

Specimen Volume: 0.5 mL from a 24-hour timed urine collection. No preservative.

                 Refrigerate specimen during collection, and send specimen refrigerated.

Stability: Urine urea nitrogen is stable at 4-8°C for 4 days.

Collection Instructions: Obtain 24 urine jug from laboratory.

Note: 1. Starting and ending times of collection are required for processing.

           2. When a 24 hour urine for urea nitrogen is done, a PV (period and volume) must also

               be ordered and resulted. (FOR LAB USE ONLY)

Reference Values

12-20 g/24 hours

Useful For

Measurements of urine urea nitrogen are used in the diagnosis and treatment of certain renal and metabolic diseases.

Day(s) Test Set Up

Monday through Sunday


Urease with Glutamate Dehydrogenase (GLDH)

Test Classification and CPT Coding

81050-Timed urine measurement

84540-Urea nitrogen