Otoacoustic Emission (OAE) Test
This information can be used to :
1.Screen hearing (particularly in neonates, infants, or individuals with developmental disabilities),
2.Partially estimate hearing sensitivity within a limited range,
3.Differentiate between the sensory and neural components of sensorineural hearing loss, and
4.Test for functional (feigned) hearing loss. The information can be obtained from patients who are sleeping or even comatose because no behavioral response is required.
Basis of OAE:
--> Transient otoacoustic emissions (TOAEs) or transient evoked otoacoustic emissions (TEOAEs) - Sounds emitted in response to an acoustic stimuli of very short duration; usually clicks but can be tone-bursts
--> Distortion product otoacoustic emissions (DPOAEs) - Sounds emitted in response to 2 simultaneous tones of different frequencies
--> Sustained-frequency otoacoustic emissions (SFOAEs) - Sounds emitted in response to a continuous tone
Pure-tone (PT) audiometry measures throughout the outer ear, middle ear, cochlea, cranial nerve (CN) VIII, and central auditory system. However, OAEs measure only the peripheral auditory system, which includes the outer ear, middle ear, and cochlea. The response only emanates from the cochlea, but the outer and middle ear must be able to transmit the emitted sound back to the recording microphone.