While the more obvious Parkinson’s symptoms, such as tremors and muscular rigidity, appear at a later stage, dysfunction in the sense of smell can be detected months or even years earlier, thanks to the newly developed sniffing test.
Meskipun gejala - gejala Parkinson yang semakin jelas, seperti gemetar dan kekakuan otot, tampak pada stadium berikutnya, disfungsi indra penciuman dapat dideteksi berbulan - bulan bahkan bertahun - tahun di muka, berkat alat baru uji penciuman itu.