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Test Code OSMO Osmolality, Serum

Performing Laboratory

ChristianaCare:

  • Newark Campus
  • Wilmington Campus

Methodology

Freezing Point Depression
Useful for evaluation of electrolyte balance, hyperosmolar status, and hydration status.

Reference Values

275-295 mOsmol/kg H2O

Physician Office Specimen Requirements

Container/Tube:  3.5-mL gel separator tube
Specimen:  Full tube
Collection Instructions:  For pediatrics, draw blood in a 0.5-mL green-top MICROTAINER®.
Note:  Label tube with patient’s full name and 1 additional unique patient identifier such as date of birth, medical record number, emergency ID number, date and time of draw, collector’s initials, and type of specimen.

Day(s) Test Set Up

Monday through Sunday

Routine Turnaround Time:  8 hours

STAT Turnaround Time:  1 hour