The U.S. FDA has announced the next stage in its program to down-classify a series of in vitro diagnostics (IVDs) from class III to class II, a change that would significantly ease the premarket requirements for these test types. Much of the emphasis here is on companion diagnostic (CDx) tests, a category of products that is the focus of a separate FDA imperative, but there are those who view this down-classification regime as little more than a meager attempt to paste over a massive impending regulatory overhang.