As the song goes, the Food and Drug Administration’s (“FDA’s”) 2024 Final Rule regulating laboratory-developed tests (“LDTs”) as medical devices (“Final Rule”), is not merely dead—it’s really most sincerely dead.

Perhaps not for good, but for the foreseeable future, at least.

The FDA has let the clock run out on the 60-day time period to appeal the March 31, 2025, decision by the U.S. District Court for the Eastern District of Texas concluding that: 1) the FDA overstepped its authority, and 2) the LDT Final Rule of May 6, 2024, was unlawful. As we explained at that time, the Final Rule would have required virtually all clinical laboratories offering their own LDTs to comply with FDA expectations for medical device manufacturers in phases over a four-year period—with the first compliance

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