I'm in Germany and I've been diagnosed with ADHD-PI lately (I am in my 30s) after seeing a private specialist about this topic. In addition to that DSM test and 3 other questionnaires, they ran a computer test measuring my ability to concentrate which was repeated after a couple of weeks on medication. The test results were very conclusive and I think that is the strongest diagnosis criteria that I have as it's actually measurable.
It was actually really hard for me to find a doctor to actually diagnose me. I called several doctors and it was either "we're not taking any more patients because diagnosis takes too long" or "we can't tell you if we can diagnose it, you can't make an appointment here, so come in but you might have to wait half a day". Not to mention that by the time you get to your doctor, un-medicated, you will forget to tell about half of your symptoms.