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Body Fluid Volumes - Calculator


Body fluid compartments: The human body may be conceptually divided into various fluid compartments which represent divisions of how portions of the body's water, solutes, and suspended elements are segregated. The two main fluid compartments are the intracellular (space within the organism's cells) and extracellular compartments (separated by semi-permeable membranes). This calculator provides estimates of these fluid volumes based on a few variables.
Gender
Weight
Intracellular fluid (ICF): inside cells. Comprises 2/3 of the total body water.

Extracellular fluid (ECF): outside cells. Comprises the remaining 1/3 of your body's water. Composed of: 
a. Plasma: fluid portion of blood.   
b. Interstitial fluid (IF): spaces between cells.  
c. Transcellular fluid: lymph, cerebrospinal fluid, synovial fluid, serous fluid, gastrointestinal secretions

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