Body Water Deficit
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Sodium (mmol/L)
Weight
unit kg lb
R e s u l t s
Body Water Deficit in L
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Body Water Deficit
 

Body Water Deficit (in liters)=

0.6 * Wt * [(Na/140) - 1]

Wt=current weight in kg

Na=measured serum Na in mEq/L

Assumes Total Body Water is 60% of current body weight; may be less in female or cachectic patients

Expanded formula: Deficit= Desired TBW - Current TBW=

[(Na*0.6*Wt)/Normal serum Na] - (0.6*Wt)