boston life sciences sells/develops pd diagnostic products, i think they might be a little biased.
i guess i should have said i doubt there is 30% or more of long term misdiagnosis of parkinson's.

is that misdiagnosis rate just for incorrectly saying someone has pd or missing the fact they have pd and calling it something else?

sorry, not convinced that there are more than a million people misdiagnosed as pd. but we'll never know until better/cheaper diagnostic tools are developed which is the major point here i think. plus better training of GP's. i showed many pd symptoms which my GP missed, the primary one being lack of right arm swing and we played soccer together!! i also had 2 frozen shoulders prior to my diagnosis. what spurred me on to get a diagnosis was difficulty cleaning my hard contact lenses between my fingers on my right hand, went to see an orthopedic doctor, he referred me to a neurologist.