Abstract
Purification of a high unit platelet concentrates was tried by filtration through Egyptian cotton wool (Imugard® filter, Terumo Corp.), to obtain leukocyte-poor platelet concentrates. With this simple procedure, more than 99.9% of the leukocytes were removed and the recovery of platelets exceeded 85% by using 45g of Egyptian cotton wool. The in vitro platelet function was normal. In addition, the residual leukocyte count was 1×107 cells/bag or less. The reduction of leukocytes may reduce possibility of alloimmunization and other harmful effects of transfusion.
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