What an otoacoustic emissions test does

An otoacoustic emissions (OAE) test measures whether the inner ear is working properly by detecting sound waves your ear produces on its own. When sound enters your ear, the inner ear's hair cells vibrate and send back faint echoes — these echoes are the "emissions." A machine records whether those echoes are present and strong enough. If they are, your inner ear is likely functioning normally. If they are weak or absent, it suggests a hearing problem.

The test takes about 5 to 10 minutes, makes no sound you can hear, and requires no response from you. A small probe fits into your ear canal and measures the echoes automatically. You do not have to press a button, raise your hand, or tell the technician anything. This makes it especially useful for testing newborns, young children, and people who cannot respond to traditional hearing tests.

Key Takeaways

  • An OAE test detects faint sound waves your inner ear produces naturally when it receives sound input.
  • The test is painless, takes 5 to 10 minutes, and requires no active response from the person being tested.
  • A small probe placed in the ear canal measures the echoes; the machine records the results automatically.
  • OAE testing is often the first step in newborn hearing screening and is used to rule out inner ear damage in older children and adults.
  • A normal result suggests good inner ear function, but a follow-up test may be needed if results are unclear or abnormal.

When doctors order an OAE test

Newborn hearing screening is the most common reason for an OAE test. Most hospitals perform this test before a baby leaves the maternity ward or within the first few weeks of life. The goal is to catch hearing loss early so that treatment or intervention can begin before the child learns to speak.

OAE testing is also ordered for older children and adults when a hearing problem is suspected. A doctor might request it if someone reports difficulty hearing, if an infection or injury affects the ear, or if certain medications known to damage hearing have been used. The test can help determine whether the problem is in the inner ear (where the hair cells are) or elsewhere in the hearing pathway.

How the test is performed

The technician will seat you or your child in a quiet room and insert a small, soft probe into the ear canal. The probe contains a tiny speaker and a microphone. The speaker sends very soft clicking sounds or tones into the ear. These sounds are so quiet that you may not hear them clearly, or may not hear them at all.

When the inner ear receives the sound, its hair cells vibrate and produce faint echoes. The microphone in the probe picks up these echoes and sends the signal to a computer. The computer displays a graph showing whether echoes were detected and how strong they are. The technician may test both ears and may repeat the test if the first reading is unclear.

Throughout the test, you or your child should remain still and quiet. Loud background noise, movement, or crying can interfere with the measurement. If a baby is fussy, the technician may wait for them to calm down or reschedule the test.

What the results mean

A normal result means echoes were detected in one or both ears. This indicates that the inner ear is responding to sound as expected and suggests normal hearing function. In newborns, a normal OAE result is reassuring but does not may provide perfect hearing throughout life — some hearing problems develop later.

An abnormal or unclear result means echoes were not detected, were very faint, or the test could not be completed reliably. This does not automatically mean hearing loss is present. Fluid in the ear canal, earwax, or a cold can block the signal. The technician will usually recommend a follow-up test in a few weeks to see if the result changes.

If both the initial test and the follow-up test show no echoes, further testing is needed. An audiologist may perform an auditory brainstem response (ABR) test, which measures how the hearing nerve responds to sound. This test can confirm whether hearing loss is real and how severe it is.

Why OAE testing is used for newborns

Newborns cannot tell you whether they hear a sound, so traditional hearing tests that require a response do not work. OAE testing works because it measures the ear's automatic response — no cooperation needed. A baby can be sleeping, awake, or fussy, and the test can still be performed.

Early detection of hearing loss is critical. Children who do not hear speech in their first few years of life may have permanent difficulty learning language. Identifying the problem early allows families to pursue treatment options such as hearing aids, cochlear implants, or sign language instruction before the child's language development is affected.

Limitations and when follow-up testing is needed

OAE testing is sensitive — it detects whether the inner ear is producing echoes — but it does not measure how well someone actually hears or understands speech. A person can have normal OAE results and still have hearing loss in other parts of the ear or hearing system. Conversely, a person with normal hearing can have an abnormal OAE result due to temporary factors like fluid in the ear.

If an OAE result is abnormal or unclear, the next step is usually an ABR test or a formal audiological evaluation. An audiologist can perform tests that measure how well you or your child responds to different volumes and pitches of sound, and can assess whether hearing loss is affecting speech development or school performance.

In some cases, OAE testing is repeated after a few weeks or months. Temporary conditions like fluid from a cold or infection can resolve on their own, and a second test may show normal results. If results remain abnormal, a referral to an ear, nose, and throat (ENT) specialist or audiologist is the standard next step.

Frequently Asked Questions

Does an OAE test hurt or cause any discomfort?

No. The probe is small and soft, and the sounds are very quiet. The test is painless. Some people find the probe slightly uncomfortable if inserted too deeply, but the technician can adjust it. Babies may cry if startled by the probe, but the test itself does not cause pain.

Can earwax or fluid in the ear affect the results?

Yes. Earwax blocking the ear canal or fluid from a cold or ear infection can prevent the probe from detecting echoes, leading to an abnormal result even if hearing is normal. This is why follow-up testing after a few weeks is often recommended — the temporary condition may resolve, and a second test may show different results.

What should I do if my newborn fails the OAE test?

A failed OAE test does not mean your child has permanent hearing loss. The next step is usually a follow-up OAE test or an ABR test performed by an audiologist. Your pediatrician or the hospital will provide a referral. Early follow-up is important so that if hearing loss is present, intervention can begin quickly.

Is OAE testing covered by insurance?

Most insurance plans cover OAE testing when ordered by a doctor, especially for newborn screening. Coverage varies by plan and state. If you have questions about cost, ask your healthcare provider or the testing facility before the appointment.

Can OAE testing detect all types of hearing loss?

No. OAE testing detects whether the inner ear's hair cells are producing echoes, but it does not measure how well the entire hearing system works. Some types of hearing loss occur in the hearing nerve or brain, not in the inner ear, and would not show up on an OAE test. This is why abnormal results often lead to additional testing.