We use several different tests at Wigan Hearing because no single measurement tells us everything about someone’s hearing. One of these is distortion product otoacoustic emissions (DPOAE) testing, an objective way to look at how part of the inner ear is responding to sound.
What does DPOAE stand for?
DPOAE means distortion product otoacoustic emission. Within the cochlea are specialised sensory cells called outer hair cells. When the inner ear responds to sound, it can generate extremely faint sounds of its own. A sensitive microphone can record these responses.
What happens during the test?
We gently place a small, soft-tipped probe in the ear canal. It presents pairs of tones at selected frequencies while a microphone measures the very faint response returning from the ear. You do not have to press a button or tell us when you hear a sound. It helps if you remain reasonably still and the room is quiet.
The test does not involve needles or any operation. It is generally straightforward, although we may need to reposition the probe to obtain a reliable result.
Why might we carry out DPOAE testing?
DPOAEs provide information about the function of outer hair cells in the cochlea. We may use them as a supplementary measurement when investigating hearing concerns or when results from different tests need to be considered together.
Does a normal DPOAE result mean my hearing is normal?
No. DPOAEs are not a replacement for an audiogram or speech testing. A present response suggests that some cochlear outer hair cell activity is functioning at the frequencies examined. Responses can also be affected by wax, the ear canal and middle-ear conditions. Some hearing disorders may be present even when DPOAE responses are recorded.
We interpret the findings alongside your history, ear examination and other appropriate tests, such as tympanometry or hearing assessment.
Do I need to book DPOAEs separately?
Not necessarily. We decide which measurements are appropriate after discussing your symptoms and reviewing the initial findings. If you would like to know whether this test is relevant to your situation, contact Wigan Hearing or call 01257 444044. Hearing-test appointments are arranged by enquiry rather than direct online booking.
Clinical reference: ASHA — Hearing Loss in Adults.