 Stroboscopy and voice assessment are important to establish an individual treatment plan to improve the voice.Breathing tests (spirometry, body plethysmography) are used to measure impairment of respiratory flow through the larynx, particularly in patients with bilateral paralysis.Electromyography of the larynx muscles (larynx EMG), which measures the electrical activity of the larynx muscles via thin needle electrodes, allows better differentiation between a neural lesion and other causes of impaired mobility of the vocal fold and localization of the lesion along the nerve.