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PRBC Transfusion Effectiveness
Besides the date of blood donation and its expiration date, there is also the variation of actual volume amount which for me has ranged from 238ml to 343ml (a volume difference of 44 per cent is considerable).
Another variable to consider as the number of transfusions and antigens increase is the cross/match process which takes longer to do as well as becoming more difficult to find a donor that is compatible. 
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Ric: Low-risk MDS (blasts <4%); 4 cycles Revlimid no positive response; PRBC transfusion dependent; so far, 392'units' over 8 3/4 years; BMB #4 (15/04/01) shows evolution to AML (blasts 20-30%  ) 47,XY,del(5) (q22q35),+21[24][cp24]/46,XY(1).
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