[Erythrocyte-plasma water exchange studied by nuclear magnetic resonance spin-spin (T2) relaxation. Relation between the time the water molecule stays in the erythrocyte and its volume].

A simple, precise and rapid pulse nuclear magnetic resonance technique for measuring the rate of water exchange across the erythrocyte membrane is presented. The effects of cell volume on cell water lifetime may be eliminated by the introduction of a cell water diffusion coefficient. This parameter is applied to the study of eleven blood samples.