This test examines the function of the middle-ear and mobility of the eardrum. It measures the impedance of the middle ear to sound by using an airtight seal and a microphone to deliver sound into the ear canal. The amount of sound that is absorbed from the middle ear is measured at the microphone at normal, positive, and negative air pressures. Tympanometry is useful in identifying middle-ear disfunctions.
Tympanometry
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