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Kathy, While there are no tests that I know of now for PD, researchers are working on them. One such thing is the Dopascan from Guilford Pharmaceuticals. I don't know if it has yet won FDA approval or not. For info, visit their website. It's well worth it. Their web address is: http://www.guilfordpharm.com/products/dopascan.htm Hope this helps. Barb Brock