2622370 ECFV extracellular fluid volume 137 906341 ECV extracellular fluid volume 73 902634 ECF extracellular fluid volume 35 914274 EFV extracellular fluid volume 13 902641 E.C.F extra-cellular fluid volume 3 901857 ECE extracellular fluid volume 1 2625763 ECVF extracellular fluid volume 1 2632249 EFCV extracellular fluid volume 1 2629999 eECV extracellular fluid volume 1