Parkinson's disease and other movement disorders
Parkinson’s disease is diagnosed by patient history and observation during neurological exam.
Parkinson’s disease is a type of parkinsonism. Parkinsonism is a set of symptoms felt by you, the patient, and signs noticed on neurological examination, that all have something to do with tremor, or slow, discoordinated, rigid or difficult movement. This is all to say that Parkinson’s disease is diagnosed by observation of patient and neurologist. There is no test or procedure that unequivocally points to this diagnosis.
Parkinson’s disease and other disorders with parkinsonism are movement disorders, but not all movement disorders involve parkinsonism–long stretch. for instance, benign essential tremor, perhaps the most common movement disorder, is not considered part of parkinsonism despite the involvement of tremor.