Endocrinology
Corrected Sodium in Hyperglycemia (Katz & Hillier Equations)
Calculates true physiological serum sodium in DKA and HHS, correcting for osmotic pseudohyponatremia.
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Parameters
Corrected Sodium in Hyperglycemia (Katz & Hillier Equations) Result
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Formula
Hillier Formula: Corrected Na⁺ = Measured Na⁺ + 0.024 × (Glucose - 100)
Katz Formula: Corrected Na⁺ = Measured Na⁺ + 0.016 × (Glucose - 100)
Effective Osmolality (mOsm/kg) = 2 × Measured Na⁺ + (Glucose / 18)Clinical Pearls
Mandatory clinical calculation in emergency departments and intensive care units to prevent lethal misclassification of hydration state during DKA/HHS resuscitation.
Limitations
Severe hypertriglyceridemia or paraproteinemia can cause additional laboratory artifacts (pseudohyponatremia due to volume displacement), requiring direct ion-selective electrode (ISE) potentiometry.