Osmolality, Urine 24 hour

Method Name

Freezing Point Depression


Osmolality, 24 Hour Urine; Osmolarity, Osmolarity - 24hr Urine

Specimen Required

urine in a 24 hour urine container (available from the Laboratory)

Specimen Minimum Volume

submit entire collection

Specimen Stability Information

Keep refrigerated during collection.

Special Instructions

Urine osmolality will vary with dietary intake.

Performing Laboratory

As ordered. Turn around time is 4 hours.

Reference Values

Male: 770 – 1630 mOsm/kg nFemale: 430 – 1150 mOsm/kg