Do you ask the doctor to stop so you can discuss which vendor will be recieving test materials prior to blood draw?
I’m generally discerning of the lab doing my bloodwork. You can look up ratings online. Less out of paranoia for being defrauded and more for comfort.
I would NEVER patronize a doctor who sent my blood to Theranos. At the time it was operating in Arizona, it was only after a tremendously intense and expensive lobbying campaign to get approval. That was very much in the news at the time.