Filter Columns for Preparation of Leukocyte‐Poor Blood for Transfusion

Abstract
Filter columns (Imugard filters) packed with cotton wool prepared from Gossypium barbadense cotton removed 95-100% of [human] leukocytes from packed red cell suspensions. Recovery of red cells was about 95%. The efficacy was similar for ACD [acid-citrate-dextrose] and heparinized blood. Blood was filtered below 10.degree. C within 30 min under pressures of less that 0.2 kg/cm2. The shape and functions of the red cells were not altered by filtration. No pyrogenic or toxic substances and little particulate matter was eluted from the filters.