I'm curious why you are going through doctors and not direct to consumers at the begging? I understand FDA might force you to limit your marketing claims, however you now need to convince both physicians and consumers of the benefits of these tests. No? Where as I would imagine there will be enough early-adopters in the consumer space who'd be happy to pay for a test like this.
You can later move to the physicians space and assuringly get insurance companies cover the costs, when you have been more stablished.
Would love to learn more about your thinking and strategy here.