How is ALS diagnosed?

There is no single test to diagnose ALS. Instead, it must be diagnosed by ruling out all other possible causes of symptoms. For this reason, diagnosis can take months, or in some cases, years.

A positive diagnosis should come from a neurologist specializing in motor neuron diseases. It is confirmed by a positive EMG, and negative results from other tests, including blood work, MRIs, and CAT scans. Patients should also exhibit a history of progression of symptoms.

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