Laboratory Testing — No Doctor Required?

Let’s assume, for the sake of argument, that I am a healthy 43-year old man. Nevertheless, I am interested in getting my Vitamin D level checked. My primary care doc says it’s unnecessary, but that doesn’t matter because a variety of direct-to-consumer testing companies will do it without a doctor’s prescription, for a fee of course. Is that ok? Should I be able to get the test? What if instead of my Vitamin D level I want to test my testosterone level, or my PSA, or my cadmium level, or my Lyme disease antibodies, or even a full-body MRI scan. All of these tests are available from a variety of direct-to-consumer testing companies. If I am willing to pay, should I be able to get those too? <a href="https://fperrywilson.medium.com/laboratory-testing-no-doctor-required-c218c46ef60a">Click Here</a>