Abstract. Using the filtration method described earlier, leukocytes were removed from units of fresh whole blood and erythrocyte suspensions (hematocrit 50%). After filtration, the units were stored for one or two weeks. Units of whole blood and erythrocyte concentrates were stored for periods up to three weeks, the leukocytes were then removed by filtration, and the units were stored for another week. During the storage period, the following parameters were measured: pH and concentrations of ATP + ADP, 2,3‐diphosphoglycerate, hemoglobin and potassium (Hb and K+ in the cell‐free supernatant). The parameters used in the present study indicate that removal of leukocytes by filtration did not cause significant alteration to stored whole blood and erythrocyte concentrates, compared to unfiltered blood stored for the same time.

Abstract. (1) Sterile filtration of whole blood or blood cell suspensions in saline through columns of tightly packed cotton wool results in removal of over 95% of the leukocytes. (2) From whole blood, thrombocytes are inefficiently removed by the filtration procedure; filtration of blood cell suspensions in saline results in a better removal. (3) A system is designed by which filtration of 500 ml portions can be performed in less than 1 h at room temperature. (4) Red cell recovery with this system is over 90%. (5) Neither pyrogen tests nor toxicity tests did reveal the elution of harmful substances from properly prepared columns.

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