Immittance testing, which includes Tympanometry and Acoustic reflex measures, evaluates the eardrum and middle ear space behind the eardrum, as well as the muscle reflex that involves the eardrum, middle ear, inner ear, auditory nerve, the auditory brainstem pathways and the facial nerve. This test helps to localize what part of the ear may be involved in hearing loss.

During Tympanometry testing, a slight pressure is introduced to the ear in order to determine how well the eardrum moves and the degree of air or fluid pressure behind the eardrum. This test determines the presence of an ear infection or Eustachian tube dysfunction.

During Acoustic reflex testing, loud tones that are brief, not uncomfortable and will not damage hearing, are presented to each ear individually. This measure provides information regarding the status of the hearing nerves.