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labeling units with historical antigen typing

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I am just wondering if anybody (any Blood Centers) has been labeling units with historical antigen typings since 2017 FDA guidance came out. For those who are doing these, I am also curious to see what kind of processes you have in place and which antigens you are labeling using historical antigen typing. *FDA guidance document attached* 


Edited by dothandar

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Hear anymore on this subject ?  I too am curious. To my knowledge our blood center labels rRBCs as antigen negative confirmed only based on current results. If an historic antigen is called out on the tag it will say “historically types” Cw- for example 

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