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Tuesday, December 18, 2012

Free Water Deficit


Question: 70kg man with serum sodium of 168 - what is the free water deficit?
Answer: Deficit = (Na - 140)/140 x total body water (Men = 50% of weight, Women = 40% of weight) = (168-140)/140 x 35 = 7 Liters (half of which should be replaced in the first 24 hours)
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