LSN is diagnosed, according to David Sychamore's important article in october 2008 ENT Today:
Mainly by patient history. If the patient can remeraber the acute onset of the symptoms (chronic cough/globus/throat clearing/odynopagia), then chances are you are dealing with LSN.
There are also physical searches and something to do with electrical stimulation of the larynx. With that, they can sense nurabness or paralysis of the different parts of the larynx, like the vocal folRAB.
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