All calculations are based rigorously on the formulas and data provided by the authoritative source: MDCalc.
The serum osmolality is calculated using the formula:
Osmolality (mOsm/kg) = 2 × [Na+] + [Glucose]/18 + [BUN]/2.8
Suppose a patient has [Na+] = 140 mmol/L, [Glucose] = 90 mg/dL, and [BUN] = 14 mg/dL. The osmolality would be calculated as:
Osmolality = 2 × 140 + 90/18 + 14/2.8 = 280 + 5 + 5 = 290 mOsm/kg
Serum osmolality is a measure of the solute concentration in blood.
Osmolality helps assess the body's water-electrolyte balance.
It depends on clinical circumstances, often checked in cases of dehydration or electrolyte imbalance.
Factors include sodium, glucose, and urea levels.
Yes, using the formula provided above.