We had a dialysis patient this morning with a positive antibody screen and a negative panel except that auto control was positive. The DAT was positive with the polyspecifc reagent and anti-IgG but negative with complement. My co-worker mentioned that 'back when we did auto-controls on everybody' that we frequently saw positive autos with dialysis patients. I've never heard of this. Has anyone else? If so, what is the cause? Thanks!