What does tympanometry compare?

Tympanometry is a diagnostic test used to evaluate the function of the middle ear by measuring how well sound travels through the ear. The test specifically compares air pressure in the ear canal with middle ear impedance. Middle ear impedance refers to how much the middle ear resists the flow of sound energy. By varying the air pressure in the ear canal, tympanometry assesses how the eardrum moves in response to these changes. This is important because it provides insight into whether the middle ear is functioning properly, can detect fluid in the middle ear, issues with Eustachian tube function, and other conditions that may affect hearing.

This understanding is crucial for identifying potential hearing issues, particularly in individuals who are deaf or hard-of-hearing, as well as for those undergoing hearing assessments in clinical settings. The other options do not accurately describe what tympanometry measures; they focus on aspects that are not directly assessed through this specific test.