Corrected Sodium Calculator
Adjust measured serum sodium levels in the presence of hyperglycemia (high blood sugar).
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Result
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Formula
Corrects for the dilutional effect of glucose, which draws water into the serum and lowers the measured sodium concentration.
Worked Example
Frequently Asked Questions
Why do we correct sodium for glucose?
High glucose levels create an osmotic pull that moves water from cells into the blood, diluting the sodium. The "corrected" value tells you what the sodium would be if the glucose were normal.
Which formula does this use?
This calculator uses the standard Katz formula (1.6 mEq/L increase for every 100 mg/dL increase in glucose).
When should I use this?
Use this whenever a patient has significant hyperglycemia (usually glucose > 200 mg/dL) to accurately assess their salt and water balance.
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