The symptoms of Parkinson's disease are usually so characteristic that frequently the medical consultation and the signing of the symptoms leads to a diagnosis.
Before more elaborate examinations for the final assurance of the diagnosis are made, a simple test can often bring a lot of information. If you give the drug levodopa (a precursor of the messenger substance dopamine, the lack of which Parkinson's disease goes back) and then improve the symptoms, this is a clear indication that it is a Parkinson's disease.
Author: Dr. med. Jörg Zorn