Quick answer: Electrocochleography (ECochG) records sound-evoked electrical responses from the cochlea and auditory nerve. It may add supportive information when Meniere disease or another cochlear disorder is being considered, but it does not confirm Meniere disease or directly measure a universal amount of endolymphatic hydrops.
Last updated: 30 August 2026
This page explains the test experience, preparation, electrode options, safety and practical limitations. For detailed result interpretation, read the ECochG results and Meniere disease guide.
What does ECochG record?
During ECochG, clicks or tone bursts are delivered through an earphone while electrodes record very small electrical responses produced by cochlear hair cells and the auditory nerve. Commonly analysed components include the summating potential and compound action potential.
The recording is influenced by the stimulus, electrode position, equipment, filtering, movement, muscle activity and hearing status. This is why a number from one laboratory should not automatically be compared with a cutoff taken from another website or report.
When might the test be considered?
A clinician may consider ECochG when the history includes recurrent vertigo with fluctuating hearing, tinnitus or ear fullness and an additional physiological test could help the work-up. It is not routinely required for every dizzy patient and should not replace the symptom history, ear examination or audiometry.
Brief position-triggered vertigo, sudden continuous vertigo, faintness and neurological symptoms follow different diagnostic pathways. The vertigo diagnosis guide explains why testing should be selected from the clinical pattern rather than ordered as a fixed package.
How to prepare for electrocochleography
- Bring previous audiograms, vestibular reports, imaging and a current medicine list.
- Tell the clinic about ear pain, discharge, recent ear infection, eardrum perforation, previous ear surgery or marked sound sensitivity.
- Do not stop prescribed medicines unless the clinician responsible for the test gives specific instructions.
- The ear canal and eardrum should be examined first. Wax or an active ear problem may need attention before a reliable recording can be obtained.
- Ask which electrode method the laboratory uses, how long the appointment usually takes and whether any aftercare is required.
What happens during the test?
Reference and ground electrodes are usually placed on the forehead, earlobe, mastoid or neck. The recording electrode is positioned closer to the ear. Sound stimuli are presented repeatedly and the responses are averaged by the recording system. Remaining relaxed and still helps reduce muscle and movement artefact.
The appointment length varies with the method, the number of recordings and whether one or both ears are tested. A technically poor trace may need repositioning or repetition; that does not itself mean the inner ear is abnormal.
Extratympanic and transtympanic ECochG
Ear-canal or tympanic-membrane electrode
An extratympanic electrode is placed in the ear canal or against the surface of the eardrum without passing through it. Patients may notice pressure, a tickling sensation or awareness of the electrode. Signal quality depends strongly on placement and the laboratory technique.
Transtympanic electrode
A transtympanic electrode passes through the eardrum and is placed closer to the cochlea, usually after local anaesthesia and by a trained clinician. This approach can produce larger responses but is invasive and requires specific consent, sterile technique and aftercare.
Comfort, safety and uncommon complications
Extratympanic testing is generally non-invasive or minimally invasive, although contact with the eardrum can feel uncomfortable. Transtympanic testing has additional risks because the electrode passes through the eardrum.
In an observational safety study reviewing 205 transtympanic ECochG procedures, investigators reported one persistent eardrum perforation associated with acute otitis media, two cases of otitis media and three patients with pain lasting up to five days. In a separate survey of 36 patients in the same report, all described the procedure as tolerable with minimal discomfort. These older single-centre data do not provide a universal personal risk estimate, but they show why electrode type and ear health matter.
After transtympanic testing, follow the clinic’s instructions and seek review for persistent or worsening pain, discharge, fever, a marked hearing change or another concerning symptom. After an extratympanic recording, most people can resume normal activity if they feel well, but individual advice takes priority.
New evidence — August 2026: reference values depend on the method
A study published in the August 2026 issue of HNO recorded extratympanic tympanic-membrane ECochG from 47 ears in 26 normal-hearing volunteers aged 20-70 years. The reported 5th-95th percentile reference range was 0.13-0.46 for the SP/AP amplitude ratio and 0.72-1.72 for the SP/AP area ratio. There was no significant side difference, and the small age-related increase was not clinically relevant in this sample.
What this means for patients: the study provides method-specific reference data, not a universal diagnostic cutoff for Meniere disease. It involved a small group of normal-hearing volunteers and was not a diagnostic-accuracy study. Results must still be interpreted with the electrode method, laboratory reference range, audiometry and clinical history. Read the original HNO article.
Why can recording quality vary?
ECochG signals are small. Electrical interference, stimulus artefact, muscle activity, poor contact, electrode movement and suboptimal eardrum placement can reduce the signal-to-noise ratio. Published technical work shows that electrode design and direct visualisation can affect comfort and response amplitude.
A noisy or unrecordable trace should be treated as a technical limitation, not automatically as a normal or abnormal clinical result.
What ECochG cannot tell you by itself
- It cannot confirm or exclude Meniere disease on its own.
- It does not directly measure a universal amount of inner-ear fluid pressure.
- A normal result does not make persistent symptoms imaginary.
- An elevated ratio does not automatically identify the affected side, disease stage or need for surgery.
- It is not an emergency test for stroke, sudden hearing loss or inability to walk safely.
The result should answer a defined clinical question. If you already have a report, use the separate ECochG interpretation page and review it with the clinician who knows your symptom pattern and hearing results.
When urgent assessment comes first
Seek urgent or emergency care for sudden one-sided hearing loss, new weakness, facial droop, trouble speaking, double vision, severe new headache, fainting, chest pain, repeated vomiting with dehydration or inability to stand or walk safely. Do not delay time-sensitive assessment while waiting for an elective ECochG appointment.
Frequently asked questions
Is ECochG painful?
Ear-canal or surface eardrum electrodes may cause pressure or mild discomfort. A transtympanic electrode is invasive and usually involves local anaesthesia. Tell the clinician immediately if pain is more than expected.
Does a high SP/AP ratio prove Meniere disease?
No. The ratio can add supportive information, but cutoffs and performance vary by recording method and laboratory. Diagnosis still depends on the clinical pattern and hearing assessment.
Can a normal ECochG rule out Meniere disease?
No. A normal result does not exclude Meniere disease and should not end the evaluation when the history or audiometry remains concerning.
Can ECochG be performed with an ear infection or perforation?
The ear needs examination before testing. An active infection, discharge, perforation or recent ear surgery may change whether the test is appropriate and which electrode method can be used.
What should I bring to the appointment?
Bring hearing tests, prior vestibular reports, imaging, prescriptions and a short record of vertigo duration, hearing fluctuation, tinnitus and ear fullness.
References
- Gawliczek T, Morrison MC, Keller K, et al. Electrocochleography with an extratympanic tympanic membrane electrode: age-dependent reference values for vertigo diagnostics. HNO. 2026;74(8):522-528. doi:10.1007/s00106-026-01725-5; PMID: 41642302.
- Ng M, Srireddy S, Horlbeck DM, Niparko JK. Safety and patient experience with transtympanic electrocochleography. Laryngoscope. 2001;111(5):792-795. doi:10.1097/00005537-200105000-00007; PMID: 11359157.
- Simpson MJ, Jennings SG, Margolis RH. Techniques for Obtaining High-quality Recordings in Electrocochleography. Frontiers in Systems Neuroscience. 2020;14:18. doi:10.3389/fnsys.2020.00018; PMID: 32351368.
- Hornibrook J, Kalin C, Lin E, O’Beirne GA. Transtympanic Electrocochleography for the Diagnosis of Meniere’s Disease. International Journal of Otolaryngology. 2012;2012:852714. doi:10.1155/2012/852714; PMID: 22319536.
Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice, diagnosis or prescribing guidance. Consult Dr. Prateek Porwal at Prime ENT Center, Hardoi for personalised treatment.
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