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You wrote: <I'm wondering if there is any blood (or other) tests that can be <done to get a diagnosis for the early stages of Parkinson's. Any <help will be much appreciated. Sorry, but the answer is no. It's subject to much research, as the answer might not only provide a clue for treatment, but also would be most valuable in treatment research, by eliminating subjects from the trial who don't have Parkinson's. One suggested clinical sign is a subtle defect in color perception. Another is a decline in verbal fluency. There are a number of clinical observations by which practioners hope to distinguish PD from several other diseases that are similar in early stages, but misdiagnosis is still common. Disruption of dopamine metabolism inside the brain is of course the defining sign of PD, and that may be detected by sophisticated scanning techniques such as SPECT or PET. Unfortunately they are presently too costly for general diagnostic use. Cheers, Joe