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Total Body Sodium DeficitAka: Total Body Water, Total Body Water Excess, Free Water Deficit

Indications
1. Hypoosmolar Hyponatremia
Calculation: Total Body Water (TBW)
1. Men
  1. TBW = 0.6 x (kilograms Lean Body Mass)
2. Women
  1. TBW = 0.5 x (kilograms Lean Body Mass)
Calculations based on total body water (TBW)
1. Total Body Water Excess (Hyponatremia)
  1. Normal TBW = TBW x (Serum Sodium / 140)
  2. Excess TBW = TBW - Normal TBW
2. Free Water Deficit (Hypernatremia)
  1. FWD = TBW x (Serum Sodium - 140) / 140
Calculations: Total Body Sodium Deficit
1. Sodium deficit = TBW x (140 - Serum Sodium)

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This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.