The new blood test for Parkinson's is a genuine thing but at least ten years
from testing to use.  It is 80% accurate so far in confirming diagnosis but
needs time to confirm early Parkinson's in people with the potential to
develop the disease.  Dr Kay Double and her colleagues also want to come up
with some neuroprotective drug when confirming early diagnosis. There seems
little advantage in confirming a diagnosis ten years before the symptoms show
and offering no help.
Peter Dawkins PD Australia