extracellular fluid volume


ex·tra·cel·lu·lar flu·id vol·ume (ECFV),

the fraction of body water not in cells, about 20% of body weight; it consists of plasma water (about 4% of body weight), water between cells (interstitial water-lymph, about 15% of body weight), and water in dense bone and connective tissue (about 1% of body weight).
See also: intracellular fluid.