Which medical term describes an instrument used to examine the airway?

The correct term for an instrument used to examine the airway is an endoscope. An endoscope is specifically designed for visualizing internal structures of the body, including the airway. It consists of a flexible tube with a camera and light source, allowing medical professionals to observe and assess the condition of the airway, such as the trachea and bronchi.

A tracheometer is not a commonly recognized term in medical terminology and does not refer to a specific instrument for examining the airway. Instead, it suggests a tool related to measuring aspects of the trachea, but it lacks the functionality of visual examination.

A rhinometer is used for measuring the nasal passages, primarily associated with the nose rather than the airway itself. It is beneficial for assessing nasal obstruction and airflow but does not serve the purpose of examining the trachea or bronchial tubes.

A thoracoscope is intended for examining the thoracic cavity, particularly the lungs and pleura, rather than the airway. It is typically used during thoracic surgery or procedures like video-assisted thoracoscopic surgery (VATS).

In summary, the endoscope is the appropriate instrument for evaluating the airway, while the other terms refer to instruments used for different specific anatomical locations or functions.