We've written our policy to state that we run a "positive" cell on each panel we run each day. For example, if we have Fya patient, then we run the patient sample on a FYa positive cell on each rule out panel run. This way we are testing stability of panels throughout the life of each panel. In addition, we are testing different antigens throughout the week because we are a large facility with lots of antibody identifications being done. I know it seems a bit of a simple interpretation of the rule. We are currently in our CAP inspection window, so hopefully this is acceptable to our next inspector.