I have seen Quest and LabCorp widely used in hospitals. If you look at the bottom of each organization’s page, there should be a credentials or certification that they are each certified through. Search the credentialing agency and see if they are legitimate (with Britannica or other encyclopedia). There may be very small differences in level of accuracy but they generally all have to meet a minimal acceptable standard.
The short answer is: probably not.
I have seen Quest and LabCorp widely used in hospitals. If you look at the bottom of each organization’s page, there should be a credentials or certification that they are each certified through. Search the credentialing agency and see if they are legitimate (with Britannica or other encyclopedia). There may be very small differences in level of accuracy but they generally all have to meet a minimal acceptable standard.