One example that frustrated me recently was an issue that could be one of three things, each of which could be confirmed via a DNA test. The hospital’s genetics department was unwilling to just go ahead with the three different tests (they aren’t tested as part of a general DNA screen so it is three specific tests instead) even though it’s the fastest and least invasive way to diagnose. Instead they want an invasive surgical confirmation first, which is far more expensive and time consuming. They shared no good reason when I challenged this - just vague patronizing language that reiterated their unwillingness.
In general I’m frustrated that patients can’t just order the exact tests they want. Why do I need a doctor’s consent for various blood draws? I should be able to pick from a menu and pay for whatever I want.