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A member asked:
Can i know where the constant 0.4 came from in hypokalaemia formula?
A doctor has provided 1 answer
Extracellular fluid: potassium is what you are trying to replace. Most of total body potassium is intracellular. Extracellular fluid (including blood volume) represents only 40% of the total body weight. Therefore 0.4X body weight= extracellular fluid volume and should be used in calculating K+ replacement dosage. Using total body weight would cause over-replacement. Thanks for trusting HealthTap!
Answered 9/30/2015
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