|Available:||Daily, 24 hours|
|Turnaround:||Routine: 2 hours, STAT: 30 minutes|
|Volume:||mL plasma or serum|
|Container:||3 mL green top tube or green microtainer (sodium heparin)|
|Temperature:||Stable 2 hours at room temperature.|
|Uses:||Measure of the number of osmotically active particles in serum to determine the cause of fluid and electrolyte imbalances.|
|Method:||Freezing point depression|
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