free water excess
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Introduction
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TBW x (1 - Na+/140)
TBW = 0.6 x body weight in kg
TBW = 0.5 x body weight in kg in females, elderly or cachectic
* Na+ = serum sodium in mmol/L
* TBW = total body water
Additional terms
References
- ↑ Manual of Medical Therapeutics, 28th ed, Ewald & McKenzie (eds), Little, Brown & Co, Boston, 1995, pg 48