Quickly determine urine osmolality with our free calculator. This vital metric helps assess kidney function, hydration levels, and aids in diagnosing conditions like diabetes insipidus or SIADH. Input your urine sodium, potassium, and urea nitrogen to get instant results.
Formula:
The estimated urine osmolality is typically calculated using the following formula:
Urine Osmolality (mOsm/kg) = 2 × (Urine Sodium + Urine Potassium) + Urine Urea Nitrogen (converted to mmol/L)
Where:
- Urine Sodium (UNa): Urine sodium concentration, measured in mEq/L (milliequivalents per liter).
- Urine Potassium (UK): Urine potassium concentration, measured in mEq/L (milliequivalents per liter).
- Urine Urea Nitrogen (UUN): Urine urea nitrogen concentration, measured in mg/dL (milligrams per deciliter). This value is converted to mmol/L for the calculation by dividing by 2.8.