Hello. The relationship between Restless Legs Syndrome (RLS) and Parkinson's disease (PD) is still controversial. Most genetic, pathological, and imaging data argue against a close association of these two disorders. While there seems to be a slightly increased prevalence of RLS in PD patients, this may be because more cases come to light in this group. You should not worry about the opposite, namely getting PD because you have RLS. The mechanisms of these disorders are quite different.
As for diagnosing RLS, there is no specific test or scan for it. It is a clinical diagnosis. Laboratory tests may be performed , however, to rule out other conditions, such as iron and vitamin deficiencies. A sleep study, such as a polysomnogram (a test that records the individual’s brain waves, heartbeat, breathing, and leg movements during an entire night) may identify other potential causes or confounding features of sleep disruption (e.g., sleep apnea), which may impact management of RLS.
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