Having a test done is not a treatment. It is vital information about your own body. Better yet, if you have an issue and no doctor is listening to you and are willing to pay for the test, then your usage of the system simply means you're not doctor shopping. If you turn out to be right, then you can take the result and go to a doctor and get treatment. Otherwise, you can be satisfied.

The artificial scarcity created by doctors gatekeeping is unnecessary.

For example, I successfully diagnosed my own anemia disorder (thalassemia) this way. It's a simple test. I paid for it. The results are unequivocal. We can now stop giving me iron, thank you very much.