> while medicines and medical devices deployed to hospitals and homes are heavily regulated in the US, medical labs are not

Relatively speaking, this is as it should be. There are ways to cope with arbitrarily-convincingly fake lab reports (most generically, do multiple tests and compare them), whereas there's not a procedural fix for your X-ray machines occasionally going THERAC. Those measures generally aren't actually in place, but they should be anyway to cope with eg human error.

But the regulations actually in place on both patient-proximate and lab-based equipment are insufficiently stringent. (Annoyingly, they're also gratuitously burdensome.)