Currently, there is no specific test or marker for PD. Diagnosis is made by a neurologist following an examination. An MRI of the brain may be ordered to exclude other brain diseases. However, there are no clear changes on the MRI that can conclusively tell that a person has PD.
While not everyone will develop all four cardinal symptoms, at least two are required for diagnosis, in the absence of an alternative cause (for example, exposure to certain medications or history of strokes). When symptoms first appear and signs are subtle, a precise diagnosis may be difficult.
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