Home
HelpTest Code LAB107 Osmolality
Clinical System Name
Osmolality
Synonyms
Osmo
LAB107
Sample Requirements
Specimen: Whole Blood
Container(s): Gold, Gold Microtainer, Lt. Green/Mint Top-LiHep, or Lt Green LiHep Microtainer
Preferred Vol: 2 mL
Minimum Vol: 1 mL
Note: Sample should be at room temperature before testing. If it is necessary to refreeze a specimen, allow it to return to room temperature before re-testing. The presence of cells accelerates crystallization and should be avoided.
Processing Instructions
Reject due to: Age of specimen, incorrect collection container
Spin: Y
Aliquot: Y
Storage location: Core 5 Chemistry Refrigerator
Off-site collection: Spin blood and transfer serum or plasma to plastic tube and refrigerate or freeze.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum or Plasma | RT |
≤ 24 h |
| Serum or Plasma | 2-8 C |
≤ 24 h |
| Serum or Plasma | -20 C or -70 C |
≤ 30 d |
Availability
| STAT | Performed | TAT |
|---|---|---|
| Y | 24/7 | 1 h |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Core Chemistry
Phone Number: 206-987-2617 (Client Services)
CPT Codes
83930
Methodology
Method: Freezing Point Depression by OsmoPro Max, Advanced Instruments
Minimum Volume: 0.5 mL serum or plasma
Reference Range
| Age | Reference (mOsm/kg) |
| ≤ 1 m | 274 - 305 |
| > 1 m | 275 - 300 |
Critical Values
≤ 265 mOsm/kg
≥ 320 mOsm/kg