I knew for 10+ yrs that I was gradually losing use of left side but it was so slight that doctors didn't register it. My GP who is bril & long-suffering asked if I'd volunteer for a clinical trial on nerve conductivity (maybe to shut me up). The result of the test was that nerve conductivity was OK. When I went to hear the result everything happened very quickly. The neuro looked at my arms & could see some atrophy in the muscles of my left arm. He did the walking thing & gave me a thorough medical examination leading to a diagnosis of PD.
Angela.