Clinical use
Use this calculator for free water deficit in hypernatremia in therenal workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.
Calculate FWD
Interpretation
Used in hypernatremia (Na >145 mEq/L). Correct slowly: max 10-12 mEq/L per 24h to prevent cerebral edema. Add ongoing insensible and urinary losses to calculated deficit.
Required inputs
- Current Sodium
- Target Sodium
- Weight
- Sex
- Age
Evidence and limitations
This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.
References
- Adrogue HJ, Madias NE. N Engl J Med 2000;342:1493-1499
Frequently asked questions
What is the Free Water Deficit?
Free Water Deficit is a clinical calculator used for Free water deficit in hypernatremia.
How do I interpret the Free Water Deficit?
Used in hypernatremia (Na >145 mEq/L). Correct slowly: max 10-12 mEq/L per 24h to prevent cerebral edema. Add ongoing insensible and urinary losses to calculated deficit.
What inputs are required for the Free Water Deficit?
Required inputs include Current Sodium, Target Sodium, Weight, Sex, Age.
What is the evidence behind the Free Water Deficit?
The Free Water Deficit page cites Adrogue HJ, Madias NE. N Engl J Med 2000;342:1493-1499.
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