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Plasma Osmolality Calculator
Calculate serum osmolality and tonicity using standard clinical chemistry
Chemistry Guidelines: Plasma osmolality estimates solute concentration in blood. The standard formula is $(2 \times \text{Na}^+) + (\text{Glucose} / 18) + (\text{BUN} / 2.8)$. Normal reference range is $275\text{--}295\text{ mOsm/kg}$. Enter laboratory values below.
Laboratory Parameters Input
Calculation Results
⚠️ Not medical advice. For clinical chemistry, nephrology, and medical reference only. Interpretation of serum osmolality, electrolyte disorders, and fluid management must be supervised strictly by an attending physician.