Utilize our user-friendly Plasma Osmolality Calculator to quickly determine serum osmolality from sodium, glucose, and BUN values. This essential medical tool helps assess fluid and electrolyte balance, aiding in the diagnosis of various clinical conditions including hypernatremia, hyponatremia, and diabetes. Get accurate results instantly.
Formula:
The standard formula for calculating plasma osmolality (estimated serum osmolality) is:
Plasma Osmolality = 2 × Na + Glucose/18 + BUN/2.8
- Na: Serum Sodium concentration (mEq/L)
- Glucose: Serum Glucose concentration (mg/dL)
- BUN: Blood Urea Nitrogen concentration (mg/dL)
Note: This formula assumes units of mg/dL for Glucose and BUN, and mEq/L for Sodium. Adjustments are needed for different units.