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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Urea Nitrogen, Urine

Test Code(s): UREA / HCUREA

CPT Code(s): 84540

Methodology: Urease

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.

Specimen Requirements

Specimen: Random urine

Collection Container: Preferred: Sterile screw cap container

Collection Volume: Preferred: Entire collection
Pediatrics: Entire collection

Sample Analyzed: Urine aliquot

Volume Required: Preferred: 1 mL
Pediatrics: 0.4 mL

Specimen Transport: Transport entire specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Stability: Ambient: 5 days
Refrigerated: 5 days


Results reported as mg/dL urea nitrogen.

Additional Information:

Urine urea nitrogen is typically used as an indicator of renal function. For nutritional assessment of nitrogen balance see Total Nitrogen, Urine.

Urea Nitrogen, Urine

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