Some hearing evaluations don't rely on a patient pressing a button — they measure how the brain itself responds to sound. The Auditory Brainstem Response (ABR) test does exactly this, offering an objective window into the hearing pathway from the inner ear to the brainstem.
What Is the ABR Test?
ABR records tiny electrical signals generated by the
auditory nerve and brainstem in response to clicking or tone-burst sounds
played through earphones. Small electrodes on the scalp and earlobes pick up
these signals, displayed as a series of waves, revealing how well sound is
transmitted along the hearing pathway.
Test Specifications
- Duration:
45–90 min
- Equipment:
ABR system with surface electrodes, earphones/insert transducers
- Preparation:
Clean scalp; natural sleep preferred for infants, quiet rest for adults
- Setting:
Quiet, electrically shielded room at the clinic
- Age
Group: Newborns through adults
Procedure of the Test
- Scalp
and earlobes cleaned; small electrodes attached with adhesive gel.
- Patient
rests quietly or sleeps (natural/sedated for infants), as stillness
improves signal clarity.
- Clicking
or tone-burst sounds presented through earphones, one ear at a time;
electrodes detect the brain's electrical response.
- Responses
averaged over many repetitions to produce a clear waveform, then analyzed
against normal values.
Why Is the Test Done?
- Objective
hearing assessment for newborns and young children
- Screening
for patients unable to do standard hearing tests
- Evaluates
the nerve/brainstem pathway for retrocochlear conditions
- Investigates
asymmetric hearing loss, one-sided tinnitus, or suspected nerve tumors
- Estimates
thresholds objectively when behavioral testing is unreliable
What Will the Result Show?
A waveform showing distinct peaks (labelled Wave I through
V), with their timing (latency) and size (amplitude) compared against expected
normal values for the patient's age.
Interpretation
- Normal:
"Wave latencies within normal limits bilaterally — consistent with
normal nerve/brainstem function and normal estimated thresholds."
- Elevated
Thresholds: "Response present only at higher intensity —
suggestive of hearing loss; degree to be correlated with behavioral
audiometry."
- Abnormal/Absent
Waves: "Delayed or absent components beyond Wave I — suggestive
of retrocochlear involvement. ENT referral and imaging recommended."
- Asymmetric
Findings: "Significant difference between ears — warrants
evaluation to rule out one-sided nerve pathology."
ABR needs specialized electrophysiological equipment and a
quiet, shielded environment, so it's performed at our clinic. Acoustik
Hearing and Speech Clinic brings pure tone audiometry and hearing aid trials
to your home across @Mumbai, @Navi Mumbai, and @Thane — no travel, no waiting
rooms.
Book your pure tone audiometry and hearing aid trial at
home, or schedule your ABR test at our clinic.
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