Microscopic laryngoscopy and bronchoscopy (Micro L and B) is a procedure that uses a special telescope to look into the upper and lower airway. The telescope allows for a close-up view of the airway.

The telescope is passed through the mouth into the throat. The larynx (voice box), trachea (windpipe) and bronchi (lower branches of the windpipe) can be seen. This procedure is done to look at the parts of the airway and to look for any problems.