Electrolyte-Free Water Clearance Calculator
EFWC: more accurate than osmolar free water clearance for dysnatremia
When to use it
Use to assess renal free water handling in hyponatremia or hypernatremia.
Category
Electrolytes & Acid-Base
References
- Nguyen MK et al. Whole-body electrolyte-free water clearance: derivation and clinical utility in analyzing the pathogenesis of the dysnatremias. Clin Exp Nephrol. 2006;10:19-24. PMID: 16544174
- Berl T. Impact of solute intake on urine flow and water excretion. J Am Soc Nephrol. 2008;19:1076-8. PMID: 18337482
About NephroMind
This calculator is part of NephroMind, a free clinical decision-aid platform from the Arab Society of Nephrology and Renal Transplantation (ASNRT) — over 128 bedside nephrology calculators plus a renal drug-dosing database, coded by a practicing transplant nephrologist.