I think I responded to this on the AABB website, however . . . I think this depends on the training and comfort level of the techs. At my small institution we use the microscope routinely. The reason being all the techs are generalists. I have met very few technical personnel who can competently call w+ reactions macro. Granted, most reactions of this strength are not clinically significant, but THEY CAN BE. I would rather have my staff find all that they can. IF this turned out to be a big problem, i.e., over-reading, I might change my tune, but it is not.