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Test Code Osmo, Ser Osmolality, Serum

Performing Laboratory

Memorial Hospital Laboratory- Automated Procedures  304-388-5953       
General Hospital Laboratory 304-388-6244

Specimen Requirements

Serum-Plain, Red-Top Tube or a Gold SST Gel Tube 

Spin and physically separate serum from contact with cells as soon as possible

4 mL of serum (minimum 2 mL)

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient
  • Ethylene glycol, propylene glycol, acetone and similar compounds interfere by inhibiting freezing

Storage and Stability

Room Temperature 18-24o C             3 hours    
Refrigerate 2-8o C 3 days
Frozen<  -20o C Several weeks                

Reference Values

275-300 mOsm/kg

Methodology

Freezing Point Depression

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

83930