On panel cells that don't react w/my pateint plasma, I have been ignoring the heterozygous cells..... I don't look at them to do rule outs (Rh's, Kidd, Duffy, MNS) and only look at the homozygous cells to rule out, irregardless of the reaction strength. Reaction strenght may review a doseage pattern, but I look at that later. A coworker is concerned that there is no reference specifically for "ignoring heterozygous cells altogether"....just seperate references for: ruling out w/3 cells is optimal and ruling out w/2 cells is sometimes all you get looking at the cells w/the stronger antigen strenght, which is usually a homozygous cell for Rh's, Kidd, Duffy, MNS Other thoughts ? :eyepoppin