Purpose of impedance audiometry is to determine the status of the tympanic membrane and middle ear by tympanometry test.
Tympanometry test enables us to determine how well the conducting part of the ear (from the external canal and includes the middle ear) is functioning. The test will help to identify middle ear pathology.
Tympanometry allows HAC’s expert audiologist to measure how well the eardrum is vibrating when sound strikes besides the functioning of the tiny bones of the ear in transmitting those vibrations to the ear. It also helps in measuring the pressure in the space behind the eardrum that contains those bones. Any unusual findings on this test may indicate a conductive loss requiring medical evaluation.
Acoustic reflex measurement is another part of the impedance test. Acoustic reflex measurement allows the audiologist to further examine the integrity of the middle ear system. For this test, very brief, somewhat loud tones are presented to each ear, to determine whether an acoustic reflex is present or absent, without requiring any response from the patient. In a normal-hearing ear, the stapedius muscle in the middle ear contracts involuntarily in response to loud sounds presented at levels of about 70-100 dB (decibels).