Fluid Compartments

Total body water = 60% of body weight
Intracellular water = 40% of body weight
Extracellular water = 20% of body weight
Interstitial water = 16% of body weight
Plasma water = 4% of body weight

Intravascular volume = 7% of body weight (plasma volume + RBC volume)
Hematocrit = 3% (RBC volume) / 7% (intravascular volume) = 43%
Note that IV volume is part extracellular and part intracellular

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