Upper respiratory tract

Resting Airway Endoscopy is used in the diagnosis of conditions like roaring (left laryngeal paralysis) where the horse's laryngeal function is evaluated and loss of normal arytenoid function can be noted during the normal breathing cycle.

Other conditions easily identified on upper airway endoscopy include guttural pouch infections, ethmoid haematomas and epiglottic entrapment.

Evaluation of the trachea and lower airway can also be performed including fluid sampling,either a post exercise tracheal wash, or the more invasive broncho-alveolar lavage which is essential in the diagnosis of airway infections, obtaining bacterial culture samples for guiding treatment in pneumonia diagnosis and management of 'heaves' or recurrent airway obstruction.