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Corrected Sodium Calculator

Work out corrected sodium instantly with clear inputs, formula shown and shareable results.

About Corrected Sodium Calculator

Adjusts measured sodium for hyperglycaemic dilution using the Katz factor of 1.6 mmol/L and the Hillier factor of 2.4 mmol/L per 100 mg/dL of glucose above 100.

Formula

Sodium correction

Katz: corrected Na = Na + 0.016 x (glucose - 100); Hillier: corrected Na = Na + 0.024 x (glucose - 100), glucose in mg/dL

Worked example

With the default values below, Corrected Sodium Calculator returns Corrected sodium (Katz) of 134.4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Measured sodiumaccepts 90–180 mmol/L
128 mmol/L
Serum glucoseaccepts 60–1,500 mg/dL
500 mg/dL

Results

Corrected sodium (Katz)
134.4 mmol/L
Corrected sodium (Hillier)
137.6 mmol/L
Correction added by Hillier
9.6 mmol/L

Step by step

  1. 1Values used
  2. 2Sodium correction
  3. 3Corrected sodium (Katz)= 134.4 mmol/L
  4. 4Corrected sodium (Hillier)= 137.6 mmol/L
  5. 5Correction added by Hillier= 9.6 mmol/L

Assumptions and limits

  • The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Which correction should be used?

Hillier's 2.4 factor fits experimental data better, especially above 400 mg/dL glucose; Katz's 1.6 remains widely quoted.

Why does glucose lower sodium?

Glucose is osmotically active and draws water out of cells, diluting the measured sodium concentration.

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