Corrected Sodium Calculator

High glucose creates an osmotic gradient that pulls water from cells into the blood, diluting measured sodium. The corrected value reveals what sodium would be if glucose were normal (100 mg/dL).

This calculator uses the standard Katz formula: add 1.6 mEq/L to measured sodium for every 100 mg/dL increase in glucose above 100 mg/dL.

Use it whenever a patient has significant hyperglycemia (usually glucose above 200 mg/dL), particularly in DKA or HHS, to accurately assess true sodium and water balance.

The 1.6 factor (Katz) is standard for most hyperglycemia. Some evidence supports using 2.4 mEq/L per 100 mg/dL when glucose exceeds 400 mg/dL, as the relationship may not be perfectly linear at extreme values.

If corrected sodium remains below 135 mEq/L, the patient has true hyponatremia in addition to hyperglycemia, which requires separate evaluation and treatment.

No. This tool is for educational purposes only. Electrolyte correction in DKA and HHS should always be guided by a qualified healthcare professional.

Yes, the Corrected Sodium Calculator is fully embeddable. Tap "Embed" above to configure appearance and copy the code. It is free to use, works on any platform (HTML, WordPress, CMS), and adjusts to any screen size automatically. Visit calculory.com/services/embed-calculators for the complete guide.