What Is a VEMP Test?

Many people referred for vestibular assessment undergo Vestibular Evoked Myogenic Potential (VEMP) testing. Although the name sounds complicated, VEMP is a simple, painless test that provides unique information about parts of the balance system that cannot be assessed by many other vestibular investigations.

What Is Vestibular Evoked Myogenic Potential (VEMP) Testing?

VEMP testing is a specialised assessment used to evaluate the function of two important balance organs within the inner ear:

• The saccule

• The utricle

These organs detect linear movements and changes in head position, and play an essential role in maintaining balance.

Unlike tests such as the Video Head Impulse Test (vHIT) or Videonystagmography (VNG) which look at the semicircular canals and eye movements, VEMP testing examines the otolith organs, providing a more complete assessment of vestibular function.

Why Might I Need VEMP Testing?

Your clinician may recommend VEMP testing if you experience:

• Persistent dizziness

• Vertigo

• Imbalance

• Sound-induced dizziness

• Pressure-induced dizziness

• Autophony (hearing your own voice or heartbeat unusually loudly)

• Suspected Superior Semicircular Canal Dehiscence (SSCD)

• Suspected vestibular neuritis

• Bilateral vestibular loss

• Unexplained balance problems

VEMP testing is often performed alongside other vestibular investigations as part of a comprehensive balance assessment.

What Are cVEMP and oVEMP?

There are two types of VEMP test.

Cervical VEMP (cVEMP)

The cVEMP assesses:

• The saccule

• The inferior vestibular nerve

Small electrodes are placed on the neck muscles while sounds are presented through earphones. The test measures how the neck muscles respond to stimulation of the vestibular system.

Ocular VEMP (oVEMP)

The oVEMP assesses:

• The utricle

• The superior vestibular nerve

Small electrodes are placed beneath the eyes while sounds or vibrations stimulate the vestibular system. The test measures tiny responses from the muscles responsible for upward eye movements.

Together, cVEMP and oVEMP provide valuable information about different parts of the vestibular system.

What Happens During the Test?

The procedure is straightforward.

Your clinician will:

• Clean the skin where electrodes will be placed.

• Attach small adhesive recording electrodes.

• Place headphones or inserts into your ears.

• Ask you to contract certain muscles by turning your head or looking upwards.

• Present a series of clicking sounds or tone bursts.

The electrical activity produced by your muscles is recorded and analysed by specialised equipment. The assessment usually takes around 20–30 minutes.

Does VEMP Testing Hurt?

No. VEMP testing is completely non-invasive. The sounds delivered through the earphones are relatively loud, but they are brief and carefully controlled.

The adhesive electrodes are painless and simply record muscle activity, they do not deliver electricity into the body.

Some people experience mild muscle tiredness in the neck because they are asked to hold their head in certain positions for short periods.

What Conditions Can VEMP Help Diagnose?

VEMP testing is particularly valuable when investigating:

Superior Semicircular Canal Dehiscence (SSCD) - Patients with SSCD often demonstrate abnormally large VEMP responses at lower sound levels.

Vestibular Neuritis - VEMP can help determine whether the superior or inferior vestibular nerve has been affected.

Bilateral Vestibular Loss - Reduced or absent VEMP responses may indicate dysfunction affecting both vestibular systems.

Ménière's Disease - Some patients demonstrate abnormal VEMP responses due to changes affecting the otolith organs.

Vestibular Schwannoma (Acoustic Neuroma) - VEMP may provide additional information about vestibular nerve function when interpreted alongside other investigations.

Ototoxicity - Certain medications can damage vestibular function, including the otolith organs assessed by VEMP.

How Should I Prepare?

Preparation is simple.

You may be asked to:

• Avoid vestibular suppressant medication (if medically appropriate)

• Wear comfortable clothing that allows access to your neck

• Remove necklaces if possible

• Continue eating and drinking normally unless advised otherwise

Your clinician will explain any additional preparation before your appointment.

What Do the Results Mean?

The results help determine:

• Whether the otolith organs are functioning normally.

• Whether one vestibular nerve is weaker than the other.

• Whether abnormalities suggest conditions such as SSCD or vestibular neuritis.

• Whether further investigations are required.

VEMP results are always interpreted alongside your symptoms and the findings of other vestibular tests.

Is VEMP Performed With Other Tests?

Yes. At Northern Vestibular & Balance Clinic, VEMP is usually performed alongside:

• Video Head Impulse Test (vHIT)

• Videonystagmography (VNG)

• Caloric testing

• Computerised Dynamic Posturography

• Hearing tests

Combining these investigations allows us to assess every major component of the vestibular system.

How Can Northern Balance Clinic Help?

We use VEMP testing as part of our comprehensive vestibular assessment.

Our advanced diagnostic equipment enables us to investigate conditions including:

• Superior Semicircular Canal Dehiscence (SSCD)

• Vestibular neuritis

• Ménière's disease

• Bilateral vestibular loss

• Vestibular migraine

• Vestibular schwannoma (as part of a wider assessment)

• Persistent dizziness and imbalance

By identifying the specific part of the vestibular system that has been affected, we can recommend the most appropriate treatment or onward referral.

Book a Comprehensive Vestibular Assessment

If you are experiencing persistent dizziness, vertigo or balance problems, our specialist vestibular clinicians can perform a detailed assessment, including Vestibular Evoked Myogenic Potential (VEMP) testing, to help identify the underlying cause of your symptoms.