The comment you've replied to is about the Galleri test by Grail. It tests for early _detection_ of cancer, not likelihood of cancer. Meaning, you _have_ cancer. Knowing you have cancer (hopefully early) is actionable...
2 years later, I still haven't found a way to take this test and have it's results be meaningful to any actionable health outcomes.
I believe the only thing I can do is find a sketchy online doctor willing to prescribe it, and then roll the dice on whether any related testing or care based upon the results would be covered by insurance (my doctors biggest concern)
It's also weird that your doctor would be worried that insurance won't cover the costs of cancer being detected early. Saving money in this situation is not something that is on the top of my mind. Worst case I incur debt and then declare bankruptcy if I survive.