ECF is measured by
Ref: Ganong&;s review of medical physiology; 23ed edition, page no:2 Inulin A polysaccharide with the general formula C6nH10n+2O5n+1 that yields fructose when hydrolyzed and is found in the roots of many plants, especially those of the composite family. It is used as an additive in processed foods to replace fat or sugar and to increase fiber content.
Inulin
D2O
Evan's blue
3H2O
General physiology