Serum Osmolarity Calculator
Sodium Na⁺ (mEq/L)
Glucose (mg/dL)
BUN (mg/dL)
Calculated: 2×Na + Glucose/18 + BUN/2.8
Calculated serum osmolarity estimates plasma solute concentration using sodium, glucose, and BUN. Normal range: 275–295 mOsm/kg.
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