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Corrected Sodium (Glucose) Calculator

· Last updated：2026-08-08

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Calculate the glucose-corrected serum sodium to reveal true body tonicity in hyperglycemia. Classic Katz (1973) formula Na_corr = Na + 1.6 × (Glucose − 100)/100 (glucose mg/dL), or Hillier (1999) Na_corr = Na + 2.4 × (Glucose − 100)/100 which is more accurate at very high glucose (Katz tends to underestimate). Glucose unit selectable: mg/dL or mmol/L (reference 5.5 mmol/L). Hyperglycemia shifts water extracellularly and dilutes sodium; the corrected value reflects the real water balance. Corrected Na < 135 indicates true hyponatremia (DKA/HHS with free-water excess, SIADH, GI/renal losses); > 145 indicates true hypernatremia (common in HHS, signals free-water deficit and guides replacement). Derived from Katz NEJM 1973, Hillier 1999, Adrogué NEJM 2000, and MDCalc. Not medical advice.

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Tool usage guide

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Key facts

Category
Health
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Corrected Sodium (Glucose) Calculator estimates serum sodium after accounting for the diluting effect of hyperglycemia. Enter measured sodium, glucose, glucose units, and a correction factor using either the Katz 1.6 or Hillier 2.4 formula.

When to use

  • When serum glucose is elevated and the measured sodium may be diluted by hyperglycemia.
  • When assessing sodium status in clinical contexts such as DKA or HHS.
  • When comparing Katz and Hillier correction methods, especially with very high glucose.

How it works

  1. 1Enter measured serum sodium in mmol/L and serum glucose.
  2. 2Select glucose units: mg/dL or mmol/L.
  3. 3Choose the Katz 1.6 or Hillier 2.4 correction factor.
  4. 4The calculator returns corrected sodium in mmol/L, rounded to the selected number of decimal places, with a category.

Use cases

  • Reviewing sodium results in patients with marked hyperglycemia.
  • Supporting electrolyte assessment during DKA or HHS evaluation.
  • Teaching or checking the difference between Katz and Hillier sodium corrections.

Examples

1. HHS sodium assessment with the Katz formula

Clinician or medical student

Background

A patient has measured sodium of 128 mmol/L and glucose of 600 mg/dL during a hyperglycemic presentation.

Problem

Determine whether the low measured sodium remains low after correcting for hyperglycemia.

How to use

Enter sodium 128, glucose 600, select mg/dL, choose Katz 1.6, and set decimal places to 1.

Correction factor: Katz 1.6; glucose unit: mg/dL; sodium: 128 mmol/L; glucose: 600 mg/dL; decimal places: 1.

Outcome

The calculator returns corrected sodium of 136.0 mmol/L and categorizes it as corrected sodium NORMAL.

2. Severe hyperglycemia with the Hillier formula

Emergency care professional

Background

A patient has measured sodium of 124 mmol/L and glucose of 900 mg/dL, representing very high glucose.

Problem

Estimate corrected sodium using the Hillier coefficient for severe hyperglycemia.

How to use

Enter sodium 124, glucose 900, select mg/dL, choose Hillier 2.4, and set decimal places to 1.

FAQ

What does corrected sodium mean?

Corrected sodium estimates the sodium level after accounting for water shifting into the extracellular space during hyperglycemia.

Which correction formula can I use?

You can choose Katz 1.6, the classic formula, or Hillier 2.4, which is more accurate in severe hyperglycemia.

What units can I enter for glucose?

Glucose can be entered in mg/dL or mmol/L. Measured sodium is entered in mmol/L.

How is corrected sodium calculated?

For mg/dL, the formulas are Na + 1.6 × (glucose − 100)/100 or Na + 2.4 × (glucose − 100)/100, depending on the selected method.

Does this calculator provide medical advice?

No. It provides a formula-based estimate and should not replace clinical assessment or professional medical advice.

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Correction factor: Hillier 2.4; glucose unit: mg/dL; sodium: 124 mmol/L; glucose: 900 mg/dL; decimal places: 1.

Outcome

The calculator returns corrected sodium of 143.2 mmol/L and categorizes it as corrected sodium NORMAL.