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HelpTest Code OSMO OSMOLALITY
Methodology
Freezing point Depression
Useful for evaluating acutely ill or comatose patients. Increased osmolality may be caused by dehydration, hypernatremia, hyperglycemia, uremia, presence of drugs, chemicals, metabolic products, or other substances such as ethanol, methanol, or ethylene glycol.
Specimen Requirements
Submit only 1 of the following specimens:
Preferred:
Serum
Serum Gel Tube
Container/Tube: Serum gel tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of
serum
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (serum).
Alternate:
Serum
Plain, Red-Top Tube
Container/Tube: Plain, red-top tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of
serum
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (serum).
Alternate:
Plasma
Container/Tube: Green-top (lithium heparin) tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (plasma).
Day(s) Test Set Up
Monday through Sunday
Reference Values
280-290 mOsm/kg
Performing Laboratory
Logan Health Medical Center-Chemistry
Test Classification and CPT Coding
83930
Specimen Transport Temperature
Refrigerate