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Unfortunately, the diagnosis usually based on clinical findings and no further testing needed to be done.
Let me type of some of the diagnostic criteria.
diagnostic criteria - bradykinesia with at least 1 of-muscular rigidity (such as cogwheeling)-resting tremor -postural instability (unrelated to sensory dysfunction)
supportive criteria (≥ 3 required for diagnosis of definite Parkinson disease)-unilateral onset-resting tremor-progression of syndrome-persistent asymmetry most affecting side with onset-excellent response (70%-100%) to levodopa (L-dopa)-severe L-dopa induced chorea-clinical response to L-dopa for ≥ 5 years-clinical disease of ≥ 10 year duration-hyposmia-visual hallucinations-history of recurrent head injury-history of repeated cerebrovascular events with stepwise progression of parkinsonian syndrome-prior history of encephalitis-oculogyric crises-lack of clinical response to L-dopa replacement (large doses)-onset of symptoms related to neuroleptic medication treatment
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