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Brian, I have no idea if this is accurate or not...but at a Parkinson's Disease lecture given by a research scientist at National Institutes of Health in Bethesda Maryland...we were told that only a PET scan would be able to show the living brain and show how much of the substantia nigra was still functioning and be able to determine your dopamine levels...it was so expensive to run the 2 day testing involved that it was only done for research purposes (even though it really could confirm a diagnosis of Parkinson's in the research subjects). When an audience member asked if a research volunteer could then be informed as to the percentage of dopamine producing cells that were found from his own PET scan results, the researcher said that information would be made available to them if they requested. Regards, Gail Vass email [log in to unmask]