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24-Hour Urine Osmolality
MessageDay(s) Test Set Up: Monday through Sunday
Test Code
UOS24
CPT Codes
81050, 83935
Preferred Specimen
Entire 24-hour Urine
Instructions
Submit an entire 24-hour collection in a urine container supplied. No preservative.
Note: 1. Starting and ending times of collection and total volume are required on requst from for processing. 2. See "Urine Collection" in "Special Instructions."
Note: 1. Starting and ending times of collection and total volume are required on requst from for processing. 2. See "Urine Collection" in "Special Instructions."
Transport Temperature
Refrigerated
Methodology
Freezing Point
Reference Range
300-900 mosmol/kg
Clinical Significance
Osmolality is a measure of the number of dissolved solute particles in the solution (i.e., concentration of urine).
Last Updated: January 31, 2020