Water volume of the body cell mass (i.e; water in the “inactive cells” of the body)
Intracellular water is the water volume of the body cell mass. The higher the value the more water in the cells and less water in the ECW indicating health. When the body becomes toxic it will flush water out of the ICW (inside the cells) into the ECW to dilute toxicity resulting in an increased ECW reading. It is best to have a higher ICW and a lower ECW ratio.