Hello and thank you for your question.
To diagnose Parkinson’s, the physician takes a careful neurological history and performs an examination. There are no standard diagnostic tests for Parkinson’s, so the diagnosis rests on the clinical information provided by the person with Parkinson’s and the findings of the neurological exam.
The doctor looks to see if your expression is animated.
Your arms are observed for tremor, which is present either when they are at rest, or extended.
Is there stiffness in your limbs or neck?
Can you rise from a chair easily?
Do you walk normally or with short steps, and do your arms swing symmetrically? The doctor will pull you backwards.
How quickly are you able to regain your balance?
Moreover if you respond to levodopa medication prescribed for PD than also it is suggestive one has PD.
You need to see a movement disorder specialist who can clinically diagnose you to confirm if you have PD or not.
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