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Test Code UUN24 Urea Nitrogen, Urine, LAB449


Urease with Glutamate Dehydrogenase (GLDH)

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

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

81050-Timed urine measurement

84540-Urea nitrogen

Useful For

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