Osmolality
A calculated measure of blood solute concentration.
What is it
Serum osmolality reflects the concentration of solutes in blood. It is calculated from sodium, glucose, and BUN, or measured directly.
Why it's measured
Osmolality has been used in evaluating hydration and certain electrolyte disorders in research literature.
Reference range
Standard laboratory reference
275 – 295 mOsm/kg
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with dehydration and certain endocrine conditions in research literature.
Lower
Has been associated with overhydration and certain hormonal conditions in research literature.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Calculated when sodium, glucose, and BUN are measured.
Related markers
Measured in
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Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.