There's a reason medical tests aren't made easily accessible. The science of when regular testing something helps is complicated. If you test for things that are rare you might cause more harm than good by doing mass testing, because you might overwhelmingly treat people with false positive test results.

There's a lively debate around various cancer screening initiatives, which often don't have any good evidence that they overall do more good than harm. The same mechanisms are true for lots of other medical tests.

Ultimately a medical test should be treated like any other medical intervention: Only do it if you have scientific evidence that it helps the patient.