Corrected Sodium Calculator
Correct serum sodium for hyperglycemia using the Katz and Hillier correction formulas. Enter values for instant results with step-by-step formulas.
Reviewed by Rahul Singh, Health & Wellness Specialist
Formula
Corrected Na = Measured Na + 1.6 × (Glucose - 100) / 100
Katz correction: hyperglycemia dilutes sodium by drawing water into the vascular space. For every 100 mg/dL glucose above 100, sodium is artificially lowered by ~1.6 mEq/L. Some use 2.4 for glucose >400.
Worked Examples
Example 1: DKA patient
Problem:Na=130, Glucose=400
Solution:Corrected = 130 + 1.6×(400-100)/100 = 130 + 4.8 = 134.8
Result:134.8 mEq/L
Frequently Asked Questions
How are corrected lab values calculated?
Some lab values need correction for patient factors. Corrected calcium = measured calcium + 0.8 * (4.0 - albumin). Corrected sodium for hyperglycemia: add 1.6 mEq/L for every 100 mg/dL glucose above 100. Corrected QTc uses Bazett formula: QTc = QT / sqrt(RR interval). These corrections improve clinical accuracy.
Reviewed by Rahul Singh, Health & Wellness Specialist · Editorial policy