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Test Code 5541 Osmolality, Urine

Specimen Containers and Fixatives

Bottle #1 (no preservative) is the preferred collection container. Bottle #3 (HCl), 4 (sodium carboante), 5 (boric acid), and 8 (acetic acid) are NOT acceptable. A random urine sample is also aceptable.

Specimen Required

NorthShore Lab Services: submit 5 mL (0.5 min) refrigerated aliquot of a 24 hour urine collection.

Hospital setting: submit a 24 hour urine collection.

Day(s) and Time(s) Performed


Daily, 24 hours

Reference Values

650-1300 mosmol/kg

Method Name

Freezing Point Depression

CPT Code Information


LOINC Code Information