Many years ago, Peter Issitt stated that microscopes should be banned from Transfusion Laboratories (I think it was in the orange edition of his book) except for such tests where cells are being counted (such as the Kleihauer).
Many years after his wise words, I still follow his advice, and have not (yet) been involved in a missed weak antibody that has caused a clinically significant haemolytic transfusion reaction (43 years in the job), and many of those tests were performed in opaque tiles and then, as we "modernised", tube techniques.
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