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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Osmolality, Urine

Test Code(s): UOSM / GM2720

CPT Code(s): 83935

Methodology: Freezing Point Osmometer

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: 10 mL
Pediatrics: 1 mL

Sample Analyzed: Urine aliquot

Volume Required: Preferred: 1 mL
Pediatrics: 0.5 mL

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

Stability: Ambient: 48 hours
Refrigerated: 48 hours


Reference Interval:

0 days and up:  50 - 1200 mOsm/kg

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