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HelpTest Code OSM Osmolality
Performing Laboratory
YRMC, Chemistry
Day(s) Test Set Up
Monday – Sunday
Specimen Requirements
Serum- Red Top
Urine- Sterile Container
Order of Draw
Specimen Transport Temperature
Stability- Up to 4 hours from the time of collection when stored at ambient temperature (Red Top)
Stability- Up to 4 hours from the time of collection when stored at ambient temperature (Urine: Sterile Container )
CPT Code
Osmolality, Serum- 83930
Osmolality, Urine- 83935
Unit of Measure
mOsm/kg
Collection Instructions
1mL minimum volume
Serum or urine that is less than four-hours old can be accepted for testing.
Methodology
Freezing Point Measurement
Patient Preparation
No special patient preparation is necessary.