One comment from my own personal bias:
I'm sure Quest is a good lab. But since Quest offices around my area are like store-front operations that send the samples out to a lab, I"m not sure our specific blood/PSA tests are done at the same facility each time or by the same equipment each time.
For that reason I only rely on the PSA tests done by my Cancer Center who have the lab on-site. That way I'm sure the tests are done the same way on the same equipment each time (and I get the results more quickly too)
FWIW
Good luck and keep wailin' that sax 🙂
Bob