We've had it happen 4 times in the last 2 years. Always with a strong Rh system antibody. One of the samples was a CAP PT sample. Haven't figured out why it happens now when it didn't happen the first 4-5 yrs we used the instrument.
I find it useful for distinguishing weak mixed field reactivity sometimes, as well as rouleaux.I don't endorse routine examination of negative AHG reactions.
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