Corrected Sodium Calculator

Correct measured sodium for high blood glucose using both the Katz (1.6) and Hillier (2.4) factors. Example: sodium 130 with glucose 600 mg/dL corrects to 138 (Katz) or 142 (Hillier).

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Measured sodium (mEq/L)

Glucose (mg/dL)

How to use the Corrected Sodium Calculator

Enter the values in the fields.
Press Calculate to see the result with the steps shown.

Formula and method

Corrected Na = measured Na + factor x (glucose – 100) / 100 x 100, i.e. Na + 0.016 x (glucose – 100) (Katz) or Na + 0.024 x (glucose – 100) (Hillier), glucose in mg/dL.

Which factor to use

Factor	Per 100 mg/dL glucose	Use
Katz	1.6 mEq/L	Traditional, glucose below ~400
Hillier	2.4 mEq/L	Better at very high glucose

Examples

Sodium	Glucose	Katz	Hillier
135	300	138.2	139.8
130	600	138.0	142.0
125	800	136.2	141.8
140	100	140.0	140.0

Why sodium drops with high glucose

Glucose pulls water into the bloodstream, diluting sodium. The corrected value estimates sodium once glucose has normalized.

Notes

This calculator is for education and is not medical advice. Lab and clinical decisions belong with a qualified clinician who sees the whole picture.

Frequently asked questions

What is corrected sodium?

Sodium adjusted for the dilution effect of high glucose.

Which formula is better?

Hillier fits better when glucose is very high.

What if glucose is below 100?

No correction is needed.

Normal sodium?

135 to 145 mEq/L.

Does this replace a doctor?

No.

Can I use mmol/L?

Convert glucose to mg/dL by multiplying by 18.

Sources

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Effortless Math Team

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