Corrected Sodium for Hyperglycemia Calculator

Correct serum sodium for hyperglycemia using the Katz formula.

Aug 31, 2026 Fluids, Electrolytes & Acid Base #sodium #hyperglycemia #electrolytes

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Serum sodium (mEq/L)

Serum glucose (mg/dL)

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Reference Ranges Used

Sodium - Adult 136–145 mEq/L

Formula & Clinical Notes

Formula

Corrected Na = Na + 1.6 × (Glucose − 100) / 100

Clinical Notes

Hyperglycemia draws water out of cells, lowering measured serum sodium. The Katz formula adds 1.6 mEq/L for every 100 mg/dL above 100 mg/dL. In hyperglycemic hyperosmolar states the corrected sodium guides fluid management; in severe hyperglycemia some clinicians use the 2.4 mEq/L correction factor.

Sources

Katz MA. Hyperglycemia-induced hyponatremia. N Engl J Med. 1973.
StatPearls — Serum Osmolality