Earlier quoted context omitted.
They had a fully functional lab though, it just wasn't using Theranos' devices. This is what they did to Wallgreens, they sold them on the idea that they would have theranos machines in-store, but instead what they did was do IV blood draws (calling it a comparison check) .. and then would just process the samples the same way as everyone else using standard equipment. People were getting good results because Therano…
I believe they also reverse engineered a lot of the third party machines, in an attempt to make them work the way they wanted to. That's... that's bad.
After failing to produce their own reagents and hardware, Theranos pivoted to using off-the-shelf Siemens hardware and reagents (purchased through a shell company) and dramatically diluting the blood samples to make good on the "single drop of blood" customer promise.
This would've been an impressive feat of reverse engineering, software eating the world, IF IT WORKED. But it didn't. Results couldn't even pass internal audits and the FDA forced Theranos to invalidate ~1 million test results when they found what was going on.