Free water deficit calculator: Difference between revisions

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{{Free_Water_Deficit_Calculator}}
{{Free_Water_Deficit_Calculator}}


[[Category:Fluids, Electrolytes, and Nutrition]]
[[Category:Medical calculators]]
[[Category:Medical calculators]]
[[Category:Pages using gadget Calculator]]
[[Category:Pages using gadget Calculator]]

Latest revision as of 17:27, 21 March 2026

Free Water Deficit

Free Water Deficit in Hypernatremia
Parameter Value
Weight (kg)
Sex 1 Male (TBW = 0.6)   Female (TBW = 0.5)
Elderly/Child 1 No   Yes (TBW −0.1)
Current Serum Sodium (mEq/L)
Free Water Deficit L
Notes
  • Formula: FWD = TBW × [(Current Na / 140) – 1]
  • TBW = Weight × correction factor (Male 0.6, Female 0.5; reduce by 0.1 for elderly)
  • Correction rate: Do not decrease Na by >10–12 mEq/L per 24 hours to avoid cerebral edema.
  • Adrogué HJ, Madias NE. Hypernatremia. N Engl J Med. 2000;342(20):1493-1499. PMID 10816188.
Authors: