A 32-yrs-old man visits you for a periodic health examination. He has no complaints at this time. He is 170 cm (5 ft 7 in) tall and weights 75 kg. In this patient, the volumes of total body water, intracellular fluid, and extracellular fluid are, respectively.
Correct Answer: 45L, 30L, 15L
Description: Total body water (TBW) in liters equals approximately 60% of body weight in kilograms and therefore equals 45 L in a 75-kg person. Intracellular volume = 2/3 of TBW and is therefore 30 L in this case. Extracellular volume = 1/3 of TBW and is therefore 15 L in this case.
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