Osmolality
Use
Evaluate electrolyte and water balance, hyperosmolar status, and hydration status; evaluate dehydration, acid-base balance; evaluate seizures; clue to alcoholism, methanol toxicity, ethylene glycol ingestion; evaluate antidiuretic hormone function, liver disease, hyperosmolar coma, evaluate hypernatremia. Osmolarity measures the concentration of particles in solution.
Special Instructions
Not provided.
Limitations
Osmolality results can be influenced by several factors, including hyperglycemia, uremia, and alcohol consumption. Overhydration, hyponatremia, and inappropriate antidiuretic hormone secretion (SIADH) can lead to low serum osmolality. The test does not specify the cause of abnormal osmolality and should be used in conjunction with other diagnostic tests and clinical evaluations.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Osmolality
Analyte
LOINC Codes
- 2692-2 - Osmolality SerPl
- 2692-2 - Osmolality SerPl
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
2 mL
Minimum Volume
0.2 mL
Container
Red-top tube, gel-barrier tube
Collection Instructions
Pediatric: Blood drawn from heelstick for capillary. Separate serum or plasma from cells as soon as possible after clot formation. Transfer specimen to a plastic transport tube.
Storage Instructions
Refrigerate
Causes for Rejection
Hemolysis; EDTA plasma submitted
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
Other tests from different labs that may be relevant