The Quality Planning Process in action! Recently a survey of immunoassay instruments in CAP TODAY said that immunoassay methods were the "trickiest" to QC. But no matter how difficult or tricky, you can still plan quality for it. Examples in this lesson show how to choose control rules and materials for thyroxine, cortisol, thyroid stimulating hormone, and more. General suggestions for immunoassays are also given. (Preview)