Removal of leukocytes from whole blood and erythrocyte suspensions by filtration through cotton wool. V. Results after transfusion of 1,820 units of filtered erythrocytes.

1,820 units of leukocyte- and platelet-poor erythrocyte suspensions were prepared by filtration through cotton wool. On the average more than 98% of the leukocytes and 90-95% of the platelets could be removed. The red cell recovery was 96%. 97% of the units given to polytransfused patients did not cause febrile reactions. Serological follow-up of future transplantation recipients indicated that the immunization may be avoided by using erythrocyte suspensions of fresh, filtered blood.