Electrolytes and acid–base
Free-water deficit estimate
Estimate water deficit to a stated sodium reference using an explicitly entered body-water fraction.
Intended population: Adults with hypernatremia; current total body water is estimated from weight and a selected fraction.
- Body-water fraction varies with age, body composition and volume depletion; no demographic fraction is chosen automatically. This excludes ongoing losses and other fluid needs and is not an infusion volume, rate or correction plan.
Sources and scoring references
Korean Journal of Internal Medicine: adult hypernatremia evaluation (2023) ↗Implementation references reviewed October 28, 2026. Verify applicability and unusual or treatment-changing results against the linked references and local guidance.