Hello all, I've been an observer for a while in this forum and I have found some usefull advise and insights to various isssues that also happens in my place. Now I have a quick question, just out of curiosity, How many Homozygous cells are used in your setting to rule out antibodies? One:) two or three:frown: . How about Kell? Is there any standard that addresses this? Thanks -JA