THE MEASUREMENT OF THE CIRCULATING RED CELL VOLUME BY MEANS OF TWO RADIOACTIVE ISOTOPES OF IRON 1

Abstract
A method of determining circulating red cell vol. by means of 2 radioactive isotopes of Fe, based on the original technique of Hahn and associates, is described. The method gives an absolute measure of circulating red cells which is independent of the venous, arterial, or auricular hematocrit. Repeat red cell vol. measurements can be detd. without errors arising from residual red cell radioactivity levels. When used in conjunction with the dye plasma technique, the method provides an accurate measurement of total circulating blood vol.