What Is Auditory Brainstem Response Used For?

Auditory Brainstem Response is used to estimate hearing sensitivity and assess sound-related activity along the auditory nerve and brainstem. It is useful for newborns, young children, and people who cannot complete standard hearing tests reliably. Clinicians may also use it when results suggest a possible neural pathway concern.

How Long Does an Auditory Brainstem Response Test Take?

The recording often takes about 30 to 90 minutes, although the total visit may take longer because electrodes must be placed and the person must remain quiet. Infants may need natural sleep, while some patients may require a separate medical decision about sedation. The clinic should provide preparation instructions before the appointment.

Is Auditory Brainstem Response Testing Painful or Unsafe?

ABR testing is generally non-invasive. The electrodes record signals from the skin, and the earphones deliver controlled sounds. Removing the electrodes may cause minor skin discomfort, especially if adhesive is used. Tell the clinician about skin sensitivity, medical conditions, or any planned sedation before testing.

Glossary

What is Auditory Brainstem Response?

Auditory Brainstem Response is an objective hearing test that records electrical activity from the auditory nerve and brainstem after sound stimulation. Small electrodes placed on the scalp measure these responses while the person rests quietly. Audiologists use the results to estimate hearing sensitivity, assess neural pathways, and support hearing evaluation when behavioural responses are unreliable.

Last reviewed: September 5, 2026Reviewed by Dr. Sakti Prasad MohantySources reviewed: American Speech-Language-Hearing Association, Auditory Brainstem Response, National Institute on Deafness and Other Communication Disorders, Your Baby's Hearing and Communicative Development Checklist

Quick Facts About Auditory Brainstem Response

Key Takeaways About Auditory Brainstem Response

Electrodes record neural responses after carefully timed sounds reach the ears.
The test can estimate hearing sensitivity without requiring spoken answers.
Audiologists may use ABR for infants, children, or adults unable to complete behavioural testing.
Results can indicate problems involving the cochlea, auditory nerve, or brainstem.
ABR findings must be interpreted with medical history and other hearing tests.

Understanding Auditory Brainstem Response

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Auditory Brainstem Responseoften called ABR, is a test that measures electrical signals generated by the hearing pathway. The pathway includes.cochlea, auditory nerve, and brainstem. A clinician places small electrodes on the forehead and around the ears, then presents clicks or tone bursts through earphones.

Related glossary terms: Audiogram, Audiologist, Cochlea.

ABR doesn't require the person to raise a hand or describe what was heard. This makes the test useful when a person can't give reliable behavioural answers. Infants, young children, people with developmental conditions, and some adults may benefit from this approach. The test can estimate hearing levels and can also show whether signals travel normally through the auditory pathway.

How Auditory Brainstem Response Works, Is Measured, or Is Used?

During an Auditory Brainstem Response test. The person rests quietly while repeated sounds enter one or both ears. The electrodes detect very small voltage changes that occur within milliseconds after each sound. A computer averages many responses because electrical activity from muscles and the environment can be much stronger. This activity can overwhelm the hearing signal.

The recorded waveform usually contains several peaks. Often labelled with Roman numerals. Clinicians examine the timing between peaks, the strength of the waveform, and the softest sound that produces a repeatable response. A delayed or absent response may result from hearing loss or a weak neural signal. Movement, electrical interference, or poor electrode contact may also cause it. For this reason, electrode placement, stimulus type, and a quiet testing environment affect result quality.

Some tests use tone bursts to estimate hearing at specific frequencies. Other protocols use clicks to screen the auditory pathway or assess neural timing. Sedation may be considered when a person cannot remain still. The decision depends on age, health, local clinical practice, and medical advice. The clinician should explain preparation requirements before testing.

Why Auditory Brainstem Response Matters?

Beige behind-the-ear hearing aid beside a battery, clear ear tip, and black cleaning brush

Auditory Brainstem Response gives clinicians useful information when a conventional audiogram is not possible or does not provide a dependable result. Early identification of hearing loss can support timely choices about communication support, medical review, and hearing technology. ABR can also help separate a possible inner-ear problem from a concern involving the auditory nerve or brainstem.

ABR is not a complete diagnosis by itself. Results need comparison with case history, ear examination, tympanometry, otoacoustic emissions, and behavioural testing when possible. A waveform can look abnormal because of technical factors. Interpretation by a trained audiologist or appropriate medical specialist reduces the risk of incorrect conclusions.

When Auditory Brainstem Response Matters Most?

Auditory Brainstem Response becomes especially useful during newborn and paediatric assessment. Where reliable behavioural responses may be difficult to obtain. It also supports assessment of people with severe hearing loss, neurological concerns, or communication limitations. In some cases, clinicians use ABR before planning a hearing aid, cochlear implant evaluation, or further medical investigation.

Good preparation improves the chance of a usable recording. The person may need to sleep naturally during the test, avoid unnecessary movement, and follow instructions about feeding or medication. Families should ask what the test estimates or checks. They should also ask whether it serves as a screening examination, because each protocol answers a different clinical question.

How to Evaluate Auditory Brainstem Response?

Confirm whether the report states the stimulus type, tested ear, recording quality, and estimated hearing levels.
Check whether responses are repeatable across runs rather than relying on one unclear waveform.
Ask how ABR findings compare with tympanometry, otoacoustic emissions, and behavioural hearing results.
Review whether electrode contact, movement, background noise, or sedation could have affected the recording.
Clarify which frequencies were tested and whether further assessment is needed.

Related Concepts Compared

Auditory Brainstem Response vs. Audiogram

An audiogram records a person's behavioural response to tones or speech. ABR records electrical activity from the hearing pathway and can be used when behavioural responses are unreliable.

Auditory Brainstem Response vs. Otoacoustic Emissions

Otoacoustic emissions measure sound generated by healthy outer hair cells in the cochlea. ABR measures neural responses after sound stimulation and examines activity beyond the cochlea.

Auditory Brainstem Response vs. ASSR Test

An ASSR Test also uses electrodes and sound to estimate hearing thresholds. ASSR can provide frequency-specific estimates, while ABR is also widely used to assess neural timing and pathway function.

Expert Note

A clean ABR waveform does not automatically prove normal hearing at every frequency. Testing conditions, stimulus choice, middle-ear status, and the person's age can change interpretation, so clinicians should compare ABR findings with other test results before making fitting or diagnostic decisions.

Common Mistakes or Myths About Auditory Brainstem Response

Treating ABR as a full replacement for every other hearing test.
Assuming an absent waveform always proves permanent hearing loss.
Ignoring middle-ear fluid, movement, or electrical interference during interpretation.
Comparing ABR results from different protocols as though they used identical methods.

Auditory Brainstem Response in Practice: A Real-World Example

A six-month-old infant does not respond consistently during behavioural testing. The audiologist uses tone-burst ABR during natural sleep to estimate hearing at several frequencies. The results are then compared with tympanometry and otoacoustic emissions before deciding whether further assessment is needed.