Parkinson's Disease: Diagnosis...

There are currently no blood or laboratory tests that have been proven to help in diagnosing PD.
Therefore the diagnosis is based on medical history and a neurological examination.

The disease can be difficult to diagnose accurately.

The Unified Parkinson's Disease Rating Scale is the primary clinical tool used to assist in diagnosis and determine severity of PD. Indeed, only 75% of clinical diagnoses of PD are confirmed at autopsy.  Early signs and symptoms of PD may sometimes be dismissed as the effects of normal aging.

The physician may need to observe the person for some time until it is apparent that the symptoms are consistently present. Usually doctors look for shuffling of feet and lack of swing in the arms. Doctors may sometimes request brain scans or laboratory tests in order to rule out other diseases. However, CT and MRI brain scans of people with PD usually appear normal.