Voice & Swallowing Diagnostic Tools

Learn about the cutting-edge diagnostic tools we use at Northwest ENT and Allergy Center to diagnose and treat voice and swallowing disorders.

Functional testing for voice and swallowing disorders includes the use of the following tools. These tools allow your ENT specialist to visualize and diagnose areas of concern.

Flex Laryngoscopy

Flexible fiberoptic laryngoscopy is the most common type of examination used to visualize the areas of the throat and voice box. 

The exam utilizes a thin flexible endoscope containing fiber optic cable that can be manipulated to examine areas not normally seen by traditional examination techniques. 

After a local anesthetic has been applied to the nasal cavity, the endoscope is inserted through the nose and passed into the throat under direct visualization. Most patients tolerate this examination without much difficulty.

Flexible fiberoptic laryngoscopy can be combined with stroboscopy to further examine vocal cord vibratory capability.


Videostroboscopy is a specialized method of illuminating the vocal cords that is synchronized with vocal cord vibration to provide what appears to be a slow-motion view of vocal cord movement and vibration. 

This procedure is best done in conjunction with video recording videolaryngostroboscopy (LVS) for detailed review following examination and the ability to compare examinations. 

The features most helpful in the diagnostic process include the vocal fold closure pattern, vocal fold vibratory pattern, and the mucosal wave of each vocal fold during phonation. 

Transnasal Esophagoscopy

Transnasal Esophagoscopy (TNE) represents the latest advancement in diagnosis of esophageal-related diseases. Previous diagnostics required sedation and hours of prep. 

Due to the small size of these endoscopes, they pass through the nose with ease and are performed in an office setting without any additional medication. 

The entire procedure takes less than 10 minutes, and the patient can return to work or school the same day.

If you think you may need one of these procedures, schedule your appointment with Northwest ENT and Allergy Center today.