Tympanometry is an objective test done to analyze middle ear pathology when the tympanic membrane is normal. It can be even done in very small children who are not cooperative for pure tone audiogram.
Tympanometry is defined as the measurement of the change of impedance of the middle ear in the plane of the tympanic membrane as a result of changes in air pressure in the external auditory meatus. Tympanogram is a graphic representation with impedance or stiffness of the middle ear as the ordinate (Y-axis) and the corresponding air pressure as the abscissa (X-axis).