The gel system is great at detecting cells that formerly tested DU pos, but we still perform a DU on Rh neg moms and their babies. I can't remember an instance where the gel didn't detect the weak D.....my mind is quickly starting to lose stored data....but we still perform the test.
We use the patient cells with two drops of saline for the patient D control. Blood banking has certainly come a long way with the arrival of monoclonal reagents. And automation!
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