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One of the most useful methods available for the quantitative measurement of hemolytic rates in clinical subjects and for the evaluation of red cell viability after storage is based on the survival of transfused erythrocytes. Access to such data, however, has been restricted because of limitations in the methods hithertofore available for measuring red cell survival in vivo. The differential agglutination method of counting donor cells, the procedure most commonly employed, has limitations in that large transfusions are required;* the donor blood must be devoid of all antigenic isoagglutinins which are not likewise possessed by the recipient; the recipient's cells must contain agglutinogen A or B or Mor a combination of the three agglutinogens which is not contained in the donor blood; and, finally, this method excludes the use of autotransfusion, which would eliminate the risk of transmission of hemologous serum jaundice. The labelling of donor cells with radioactive iron (Fe55) permits the conduct of survival studies on a short term basis (1-3) but re-utilization of radioactive iron released from hemolyzed donor cells and the subsequent incorporation of this label in the recipient's red cells preclude its use in studies extending for periods longer than 24 to 48 hours.

THE USE OF RADIOACTIVE CHROMIUM 51 AS AN ERYTHROCYTE TAGGING AGENT FOR THE DETERMINATION OF RED CELL SURVIVAL IN VIVO 12