K191350 is an FDA 510(k) clearance for the ACTIVE® Free Testosterone RIA. Classified as Radioimmunoassay, Testosterones And Dihydrotestosterone (product code CDZ), Class I - General Controls.
Submitted by Immunotech S.R.O. (Prague, CZ). The FDA issued a Cleared decision on December 20, 2019 after a review of 214 days - an extended review cycle.
This device falls under the Chemistry FDA review panel, regulated under 21 CFR 862.1680 - the FDA in vitro diagnostics and chemistry framework. As a Special 510(k), this submission covers a manufacturer modification to an existing cleared device rather than a new device introduction.
Device pattern: Iterative device modification. Standard predicate reliance. This Special 510(k) clearance confirms that the manufacturer's modifications remained within the established regulatory envelope of the original cleared device.