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Keeping track of "unit" dates & volumes...
I agree with importance of donation/expiry date. But also the variation of actual volume amount in a "unit" which for me has ranged from 238ml to 353ml (a difference of 48 per cent is considerable IMO).
Another consideration is that as the number of transfusions and antigens increase, the cross/match process takes longer to do and becomes more difficult for the lab to find a donor that is compatible. For me fresh blood is preferred but compatible match is essential regardless of expiry date. 
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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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