Almost everyone who has posted on this Support Group has had a difficult time getting a diagnosis. There is -- so far as I know) a definitive test forbPsrkindon's. ( I have sen an occasional post where soneone mentioned a specific test but I don't recall the name of the test. There are also many duseases that mimic PD, and if a doctor misdiagnoses a patient, he'll prescribr yhe wrong meds, which could impede the right treatment. And in addition to thid, each case of zpD has its own manifestations so , while some patients may have a different set of symptoms. After 3 rounds of duagnostic tests over 3 years, the last doctor tried a last- ditch effort to find a diagnosis. He tried --lgiving me a dose of l-dopa. It did its magic on me. After ruling out a zillion othr co-morbidities ( every one was mild and controlled by low doses of the disease- specific meds, my doctor con cluded -- basd on my response to l-dopa tgat it was PD. You might suggest that you doctor to try it.