Uggh! Ok. So if I do an elution and the eluate is non reactive with all cells tested on both kits, is that a correlation? Or, if the eluate is reactive with all cells tested??? I cannot remember the last time that we eluted anything clinically significant. Luckily that doesn't happen very often!! Is this like trying to validate a test system using ALL antibodies for correlation? Sure, I have a frozen Diego b from 25 years ago!!! Thanks for your investigation and information!