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don't understand the question, but a emergency o transfusion would be o neg blood, it would have no a / b /ab antigens on the red cell surface and would have no rh factor, ideally, all the other blood types ( and there are many of them would be low titer)

Characteristics of the emergency? Or the blood itself? Or what? This question is very unclear as to what you are actually trying to ask. Try editing and adding some more info or reposting with a more complete question for some better answers.