At the hospital I work, homozygous cells are preferred for rule outs but if we can't find a homozygous cell, we generally use three for all heterozygous cells or so I thought. Yesterday, a co-worker tells me that we don't use 3 heterozygous cells because Kell doesn't show dosage. I am concerned because I looked it up in a textbook and Kell occasionally shows dosage. My question is not a who is right, who is wrong situation, but what I would like to know what is your procedure at your hospital? I also want to be certain because I want to be safe. Yes, I am fairly new to the field - 6 months experience. Thanks!