Osmolality (Serum)
The Osmolality (Serum) test measures the concentration of solutes in the blood, which helps assess the body's fluid balance and kidney function. Clinicians order this test to evaluate conditions such as dehydration, overhydration, and disturbances in electrolyte balance. It is commonly used in clinical situations involving suspected renal dysfunction, diabetes insipidus, or severe illnesses affecting fluid regulation. The Osmolality (Serum) test provides valuable insights into a patient's hydration status and overall metabolic state, making it a crucial tool in clinical diagnostics.
Test Essentials
Specimen Required
2 mL blood (red/gold/green). Pediatrics: 0.5 mL.
Test Category
Chemistry
Turnaround Time
Results for the Osmolality (Serum) test are usually available within 24–48 hours after sample collection.
Clinical Information
Clinical Significance
Abnormal results from the Osmolality (Serum) test can indicate various health issues. High osmolality may suggest dehydration, kidney problems, or hyperglycemia, while low osmolality could indicate overhydration or certain hormonal imbalances. The diagnostic value of the Osmolality (Serum) test lies in its ability to provide insights into fluid and electrolyte balance. Remember, only a healthcare provider can interpret these results in the context of your overall health.
Reference Ranges
Reference ranges for the Osmolality (Serum) test can vary based on age, sex, and laboratory methods. Typically, a normal range for serum osmolality is considered to be between 275 and 295 mOsm/kg. It's important to understand that these ranges are general guidelines and can differ from one laboratory to another.
Sample Preparation
Before your Osmolality (Serum) test, no special preparation is typically needed. However, it's always advisable to inform your healthcare provider about any medications, supplements, or health conditions you may have. In some cases, you may be asked to fast for a few hours prior to the test, but this is not common. Always follow the specific instructions given by your healthcare provider to ensure accurate results.
Related Tests
Code: 0212
Code: 0230
Code: P0204
Frequently Asked Questions
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