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Mayo Clinic Laboratories

Test Code OSM Osmolality

Important Note

Order LAB107 (Serum)

Order LAB420 (Urine)

Performing Laboratory

YRMC, Chemistry

Day(s) Test Set Up

Monday – Sunday

Specimen Requirements

Serum- Red Top

Urine- Sterile Container

Order of Draw

BD Vacutainer Blood Collection System

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.