Audiometric testing (hearing testing) determines the type
and degree of hearing loss. The test includes pure tone air and bone
conduction thresholds, speech recognition and immitance testing.
Auditory Brainstem Response (ABR) is a useful screening test
to evaluate the auditory nerve and brainstem. It is frequently ordered
for asymmetric hearing loss, tinnitus in one ear,
or to objectively determine threshold of hearing in very young children and some adults.
Electrocochleography (EcoG) measures inner ear function to
assist with the diagnosis of Meniere's disease (excess fluid
in the inner ear) or perilymphatic fistula (leakage of inner fluid
to the middle ear).
Electronystagmography (ENG) is helpful to rule out or confirm
a disorder of the vestibular system.