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Hyperglycaemia-Corrected Serum Sodium (Katz Formula) Calculator

Na_corr = Na_meas + 1.6 · (Glucose − 100) / 100.

Correct measured serum sodium for the dilutional effect of hyperglycaemia using the Katz formula: Na_corrected = Na_measured + 1.6 × (Glucose_mg_dL − 100) / 100. Used to assess true sodium status in DKA / hyperosmolar hyperglycaemic state, where measured sodium underestimates true sodium because high glucose draws water into the vascular space.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

mEq/L
mg/dL

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Na_corr = Na_meas + 0.016 · (Glu − 100).

In depth

Correct measured serum sodium for the dilutional effect of hyperglycaemia using the Katz formula: Na_corrected = Na_measured + 1.6 × (Glucose_mg_dL − 100) / 100. Used to assess true sodium status in DKA / hyperosmolar hyperglycaemic state, where measured sodium underestimates true sodium because high glucose draws water into the vascular space.