You don't even necessarily need insurance. Some of those tests you listed are pretty cheap so most people reading this can afford to pay out of pocket even if they're not covered by insurance.
What would an uninsured person do if the tests suggested they needed an medical intervention?
That's a pretty broad question. If you could be more specific in terms of the test results, recommended medical intervention, and patient profile (location, age, income, disability status) then I might be able to point you in the right direction.