Osmolality, Urine

Method Name

Freezing Point Depression


Osmolality, Urine; Osmolarity - Random Urine, Osmolarity - Random Urine

Specimen Required

urine in a clean, dry container

Specimen Minimum Volume

1.0 mL of urine

Specimen Stability Information

Specimen stable for 24 hours refrigerated.

Special Instructions

Osmolality will vary with dietary intake.

Performing Laboratory

As ordered. Turn around time is 4 hours.

Reference Values

Male: 390 – 1090 mOsm/kg nFemale: 300 – 1090 mOsm/kg nHospitalized patient’s random urine range: 280 – 900 mOsm/kg