Fluid Deficit Calculator
Estimate the free water deficit in patients with hypernatremia (high sodium).
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Formula
Calculates the volume of water needed to return serum sodium to a target level.
Worked Example
Frequently Asked Questions
What is the goal of free water replacement?
The goal is to safely lower serum sodium. Correcting too quickly can cause cerebral edema, so a standard target is often a 10-12 mEq/L drop per 24 hours.
What is TBW?
Total Body Water (TBW) is the estimated percentage of body weight that is water. It varies by gender and age (Adult Male: 0.6, Female: 0.5; Elderly Male: 0.5, Female: 0.45).
How should the deficit be replaced?
Deficits are usually replaced over 48-72 hours using oral water or IV D5W, following institutional protocols.
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