Osmolality
Osmolality measures the concentration of dissolved particles in your blood, including sodium, glucose, and urea. It helps assess your body's fluid balance and the ability of your kidneys to concentra…
Category: Metabolic Panel
Also known as: osmolality, serum osmolality, plasma osmolality, osm, osmolalnost
Reference range: 275–295 mOsm/kg (Source: ABIM)
Standard unit: mOsm/kg
High values may indicate
High osmolality may indicate dehydration, diabetes insipidus, hyperglycemia (high blood sugar), or uremia (high urea from kidney failure).
Low values may indicate
Low osmolality may indicate overhydration, syndrome of inappropriate antidiuretic hormone (SIADH), or adrenal insufficiency.
Frequently asked questions
- What is a normal Osmolality level?
- A typical reference range for Osmolality is 275–295 mOsm/kg (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Osmolality measured in?
- Osmolality is most commonly reported in mOsm/kg. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Osmolality reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Osmolality over time?
- Yes. Upload results from any lab and BloodId charts your Osmolality over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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