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The use of radioactive chromium in the determination of the circulating red cell mass (1, 2) and the plasma volume (3, 4) in man has been reported previously. Anionic hexavalent chromium (Na2Cr5104) is readily taken up by erythrocytes in vitro and retained by them after reinjection without appreciable loss to the plasma for approximately 24 hours. Cationic trivalent chromium in the form of chromic chloride readily tags plasma proteins in vivo and in vitro. At least 98 per cent of the radioactive chromic chloride is bound to the plasma proteins with minimal loss of the isotope to the red cells. Because of the selective affinity of erythrocytes for hexavalent anionic Cr5l and of the plasma proteins for trivalent cationic Cr5l, it seemed possible to use these two forms of the isotope for the simultaneous determination of red cell mass and plasma volume in human subjects. Simultaneous measurements of red cell mass and plasma volume were made on ten normal adult subjects with radioactive chromium. The accuracy of the combined technique was confirmed by making determinations immediately before and after the transfusion of a measured volume of blood.

THE SIMULTANEOUS DETERMINATION OF RED CELL MASS AND PLASMA VOLUME IN MAN WITH RADIOACTIVE SODIUM CHROMATE AND CHROMIC CHLORIDE 1