Introduction
In hyperglycemia, water is pulled from cells into the blood, diluting sodium and making the measured value look artificially low. The Katz correction restores an estimate of the patient's true sodium status.
How to use the Hyperglycemia Sodium Correction Calculator
- Enter the lab-measured sodium in mEq/L.
- Enter the patient's blood glucose in mg/dL.
- Click Calculate to see the corrected sodium and its classification.
Formula and Calculation Method
Corrected Na⁺ = Measured Na⁺ + 1.6 × [(Glucose − 100) / 100]
Visual breakdown
REFERENCE
Normal serum sodium range: 135–145 mEq/L
Why use this calculator
Treating the uncorrected sodium value can lead to inappropriate fluid or sodium management. This calculator applies the widely used Katz factor automatically and plots how the correction scales as glucose rises.
FAQs
Why 1.6 and not 2.4?
Both factors appear in literature; 1.6 mEq/L per 100 mg/dL glucose above normal is the more conservative, widely cited value.
Does this apply in DKA?
Yes, it's commonly used in diabetic ketoacidosis, though clinical judgment and repeat labs remain essential.
What counts as normal glucose here?
The formula assumes 100 mg/dL as the reference baseline glucose.