Short answer
OAE, ABR and ASSR are not interchangeable tests. They assess different parts of the auditory system and answer different clinical questions.
- OAE assesses outer-hair-cell function in the cochlea.
- ABR records electrical responses of the auditory pathway to sound and can be used to estimate frequency-specific hearing sensitivity and evaluate neural synchrony up to the brainstem.
- ASSR records a steady electrophysiological response to modulated tonal stimuli using mathematical response detection and can add frequency-specific threshold information in selected situations.
In paediatric audiology, the goal is not to find one “best” test. It is to cross-check several sources of information against age, middle-ear status, medical history and behavioural hearing whenever behavioural responses are reliable.
Why one test is often not enough
Hearing depends on several stages. Sound must pass through the outer and middle ear, stimulate the cochlea, travel along the auditory nerve and continue through central auditory pathways.
Different tests look at different parts of that chain. A normal result at one level does not automatically rule out every possible issue elsewhere.
The American Academy of Audiology recommends a test-battery/cross-check approach in infants and young children: combine behavioural, physiological and electrophysiological findings and investigate discrepancies rather than ignoring them.
OAE: what does it measure?
Otoacoustic emissions are very soft sounds generated by the cochlea in response to acoustic stimulation. A small probe in the ear canal presents sound and records the response associated with outer-hair-cell function.
OAE is useful in babies because no conscious response is required.
What OAE can tell us
It helps assess cochlear outer-hair-cell function. In screening mode, equipment often provides a pass or refer result according to predefined criteria.
What OAE cannot tell us
OAE is not a complete audiogram and is not a direct standalone measure of a child’s ability to hear or understand speech. ASHA specifically notes that OAE should not be used by itself as a diagnostic measure of hearing ability.
A normal OAE can also occur in some neural hearing disorders, so clinical concerns may require additional tests.
Why middle-ear status matters
The stimulus and the cochlear response must travel through the middle ear. Middle-ear fluid or other conductive problems can reduce or prevent a measurable OAE even when cochlear function is preserved.
That is one reason tympanometry is often used alongside OAE.
ABR: what does it assess?
Auditory brainstem response records electrical activity generated by the auditory pathway after sound stimulation. Surface electrodes are placed on the skin, while sound is delivered through inserts or earphones.
ABR is particularly valuable in infants who are too young for reliable behavioural audiometry. With frequency-specific stimuli, an audiologist can estimate hearing sensitivity in selected frequency regions.
What ABR can contribute
Depending on the protocol, ABR can provide information about:
- electrophysiological responses to sound;
- estimated frequency-specific hearing thresholds;
- neural synchrony and integrity of the auditory pathway up to the brainstem.
What ABR does not measure
ABR does not measure conscious speech understanding or the child’s full everyday listening experience. As the child develops reliable behavioural responses, electrophysiological estimates should be cross-checked against behavioural hearing.
ASSR: why use another electrophysiological test?
Auditory steady-state response uses amplitude- and/or frequency-modulated tonal stimuli and mathematical analysis to determine whether a statistically significant response is present.
ASHA includes ASSR within the paediatric electrophysiological test battery. Carrier frequencies such as 500, 1000, 2000 and 4000 Hz can be used, which can make ASSR helpful for frequency-specific threshold estimation in selected clinical situations.
When can ASSR add useful information?
ASSR may complement ABR when further frequency-specific threshold information is needed, including in some cases of more severe hearing loss. It should not be treated as an automatic replacement for the rest of the diagnostic battery.
Its interpretation depends on the equipment, algorithm, protocol, age and clinical question.
Simple comparison
| Test | Mainly assesses | Active response required? | Important limitations | |---|---|---|---| | OAE | Cochlear outer-hair-cell function | No | Not a direct audiogram; affected by middle-ear status; can be normal in some neural disorders | | ABR | Electrical auditory-pathway response; estimated thresholds and neural synchrony | No | Does not measure conscious speech understanding; should be cross-checked behaviourally when possible | | ASSR | Steady electrophysiological response to modulated frequency-specific stimuli | No | Interpretation depends on equipment/algorithm/protocol; used as part of a battery rather than as a universal standalone test |
Which test should a newborn have?
The choice should not be made by asking which test is “strongest” or most expensive. The audiologist considers:
- the newborn-screening result;
- whether one or both ears had a
referresult; - risk factors and medical history;
- outer- and middle-ear status;
- whether the question is screening or diagnostic;
- whether a high-quality natural-sleep recording can be obtained.
Is OAE alone enough?
Sometimes OAE is sufficient for a specific screening task. If concern persists, the child did not pass screening, speech development is delayed, or the OAE result does not fit the child’s behaviour, a broader assessment may be appropriate.
Can a hearing aid be fitted from ASSR alone?
Hearing-device decisions should not be based on one isolated number. The type, degree and configuration of hearing loss are interpreted from multiple data sources and later cross-checked behaviourally as the child becomes able to participate reliably.
Frequently asked questions
Which is more accurate, ABR or ASSR?
They have different protocols and strengths. It is not clinically useful to label one method “more accurate in every situation.” The right choice depends on the question, the child’s age and the rest of the findings.
If OAE is a pass, ABR is unnecessary, right?
Not always. In a routine screening pathway with no other concerns, a pass may complete that stage. But suspected neural hearing disorders, developmental concerns or conflicting findings can justify additional testing.
Are ABR and ASSR painful?
No painful stimulation is required. Surface electrodes record responses while sound is presented through inserts or earphones. The main practical challenge is keeping the child calm or asleep enough for a clean recording.
Does every child need all three tests?
No. The test battery is individualized.
Hearing assessment in Almaty
Ekaterina Vladimirovna Kravchenko provides paediatric audiological assessment in Almaty. The test battery should be selected according to the child’s age, previous results and the clinical question—not simply by the name of a test.
Related pages: