Measurement of intracellular fluid in a 50
years old male is done by?
a) Dilution method
b) Evans blue
c) D20
d) Indirectly
Correct Answer - D
Ans. D. Indirectly.
[Ref Ganong 23th/e p. 3-6; Guyton 12th/e p. 286-288]
Most of the fluid is calculated directly by dilution method, except for
intracellular fluid (ICF) and interstitial fluid.
Both these are calculated indirectly by calculating other body fluids.
ICF = Total body water volume - ECF volume Interstitial fluid = ECF
volume - Plasma volume