We do centrifuge and pipette the supernatant off prior to testing. I guess I will try centrifuging a few more times to see if that helps. I also am going back to using Immucor cells, as I have heard it may be due to that also. We are seeing many of the weak, non-specific reactions in our antibody screens and panels and we need to retest with Immucor cells anyway, so I am hoping that will help in that aspect as well.