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Sodium Deficit Calculator

Estimate the amount of sodium needed to correct hyponatremia to a target level.

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Formula

TBW * (Target Na - Current Na)

Calculates the milliequivalents of sodium required to raise the serum concentration to a safer target.

Worked Example

70kg Male, 120 Na, Target 130 -> 420 mEq sodium deficit.

Frequently Asked Questions

How quickly should sodium be corrected?

General guidelines suggest not exceeding a raise of 8–10 mEq/L in a 24-hour period to avoid neurological complications.

Does this calculate IV fluid volume?

No, this calculates the total deficit in mEq. You must then determine the appropriate volume of saline (e.g., 3% or 0.9%) based on clinical protocols.

What is TBW in this formula?

Total Body Water (TBW) is typically Weight * 0.6 for men and Weight * 0.5 for women.

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