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Test Code UOSMO Osmolality, Urine, LAB420


Freezing Point Depression

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Random urine collection.

Specimen Volume: 50 µL of urine

Collection Instructions: No preservative. Refrigerate specimen following collection, and send specimen refrigerated.

Reference Values

330-1,300 mOsm/kg

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Determination of serum and urine osmolality can be useful in the assessment of electrolyte and acid-base disorders, in the detection of unmeasured substances in the serum, and in the assessment of renal concentrating ability.