parkinson's diagnosis

Over a third of people we surveyed experienced negative emotions in the year following their diagnosis, with the news having the hardest emotional impact on younger people. Many people reported feeling 'like their world had ended' 'they were grieving' or 'like they didn't know who to turn to'.
We've been struggling for decades to find the answer - a definitive diagnostic test for Parkinson's. So far brain scans, blood tests and urine samples haven't come up with the goods. As a result there's often doubt, and even error, in Parkinson's diagnosis, particularly in the early stages.