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

  1. Manual of Medical Therapeutics, 28th ed, Ewald & McKenzie (eds), Little, Brown & Co, Boston, 1995, pg 48