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Mayo Clinic Laboratories

Test Code 292 Osmolality, Urine

Additional Codes

ALAB: OSMOU

PowerChart: Osmolality Urine

MA Cerner: Urine Osmolality Random

Test Method

Freezing Point Osmometry; Osmo I, Advanced Instruments

Specimen Requirement

2 mL urine is required.

Additional Specimen Collection Information

Random urine specimen in a tightly capped container. Store specimen refrigerated at 2-8°C.

Performance

Testing is performed Monday through Sunday.

Typically completed within 4 hours after the specimen arrives at the testing site.

Reference Values

0-11 months: 50-750 mOsm/kg
≥12 months: 150-1,150 mOsm/kg

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CPT Code Information

83935 Chemistry: Osmolality; urine

Useful For

Assessing the concentrating and diluting ability of the kidney

LOINC Code Information

2695-5 Osmolality Of Urine

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