A VNG test (videonystagmography test) is a diagnostic procedure used to evaluate the inner ear and the part of the brain that controls balance and eye movement. It takes 60–90 minutes, is non-invasive, and helps doctors identify the root cause of dizziness, vertigo, and balance disorders. No surgery or injections are involved.

What Is a Videonystagmography (VNG) Test?

A videonystagmography test, commonly called a VNG test, is one of the most advanced and accurate tools available today for diagnosing vestibular (inner ear) disorders. It records and measures involuntary eye movements called nystagmus — movements that are closely tied to how the inner ear communicates with the brain.

When the vestibular system is damaged or not functioning correctly, the eyes tend to move in abnormal patterns. The VNG test captures these movements using infrared cameras fitted inside specialized goggles. This data helps audiologists and ENT specialists pinpoint exactly which part of the vestibular system is causing problems.

The VNG test is considered the gold standard for evaluating conditions like benign paroxysmal positional vertigo (BPPV), Ménière’s disease, labyrinthitis, and central nervous system disorders affecting balance.

Why Is a VNG Test Recommended?

Doctors recommend a VNG test when a patient experiences:

• Persistent dizziness or spinning sensation (vertigo)
• Unexplained falls or balance problems
• Tinnitus (ringing in the ears) combined with dizziness
• Feeling of fullness or pressure in the ears
• Nausea related to head movements
• A suspected inner ear infection or nerve damage

The test helps differentiate between a peripheral vestibular disorder (problem in the inner ear itself) and a central disorder (problem in the brain or brainstem). This distinction is critical for choosing the right treatment path.

How Is a VNG Test Performed? Step-by-Step

The videonystagmography test is divided into three main subtests. Here is exactly how each one works:

1. Oculomotor Testing (Eye Movement Tracking)

In this first phase, the patient follows visual targets — such as dots or lights on a screen — with their eyes while wearing infrared goggles. The goggles record how accurately and smoothly the eyes move.

This subtest assesses the neurological pathways that control eye movement and can detect problems in the brainstem or cerebellum.

2. Positional and Positioning Testing

The patient is placed in different head and body positions — lying flat, turning the head to one side, rolling over — while the goggles continuously record eye movements. The specialist looks for nystagmus that is triggered by specific positions.

This part is especially important for diagnosing BPPV, where tiny calcium crystals in the inner ear become dislodged and cause positional vertigo.

3. Caloric Testing

This is the most clinically significant part of the VNG test. Warm and cool air (or water) is gently introduced into each ear canal separately. The temperature change stimulates the inner ear’s semicircular canals, causing a controlled, brief nystagmus response.

By comparing the response between the left and right ears, the audiologist can determine whether one ear is weaker than the other — a condition known as unilateral weakness. This is a key marker for vestibular nerve damage.

How to Prepare for a VNG Test

To ensure accurate results from your videonystagmography test, follow these preparation guidelines:

• Avoid alcohol for at least 48 hours before the test
• Stop antihistamines, sedatives, and anti-vertigo medications 48 hours prior (consult your doctor before stopping any prescribed drug)
• Do not eat a heavy meal within 4 hours of the test to reduce nausea risk during caloric testing
• Remove contact lenses on the day of the test
• Avoid caffeine on the day of the appointment
• Arrange for someone to accompany you, as you may feel mildly dizzy post-test

What Do VNG Test Results Mean?

After the test, the audiologist analyses the recordings to generate a detailed report. Results typically indicate:

• Normal vestibular function — both inner ears are responding symmetrically
• Unilateral weakness — one inner ear is significantly less responsive, suggesting damage to that side
• Bilateral weakness — both inner ears are underactive, often linked to ototoxic medication or systemic disease
• Central pathology — abnormal eye tracking patterns suggesting a brain or brainstem issue requiring neurological referral

Your ENT specialist or neurologist will interpret these results in combination with your symptoms and medical history before recommending treatment.

VNG Test in Kolkata — Where to Get It Done

If you are looking for a VNG test in Kolkata, the test is available at select audiology clinics, ENT hospitals, and balance disorder centres across the city. Kolkata has seen growing availability of advanced vestibular diagnostic services, particularly in areas like Salt Lake, Park Street, Ballygunge, and Howrah.

When choosing a centre for a VNG test in Kolkata, look for:

• A certified audiologist or vestibular specialist on staff
• Modern infrared videonystagmography equipment
• Experience with full three-subtest VNG protocols
• Clear post-test counselling and report delivery

Always call ahead to confirm availability, preparation instructions specific to that centre, and whether a referral from an ENT or neurologist is required.

VNG Test Price — What to Expect

VNG test price in India varies based on the city, type of facility, and whether the full battery (all three subtests) or a partial test is conducted.

VNG test price in Kolkata is generally more affordable compared to other metros. Some diagnostic centres include a consultation fee within the package, while others charge it separately. Check whether your health insurance covers vestibular diagnostic procedures, as many plans now include ENT diagnostics.

Frequently Asked Questions (FAQs)

Q1. Is a VNG test painful? 

No, a VNG test is completely non-invasive and painless. The caloric subtest may cause brief, mild dizziness, which resolves within a few minutes.

Q2. How long does a VNG test take? 

The complete videonystagmography test typically takes between 60 and 90 minutes, depending on the number of subtests performed.

Q3. What is the difference between a VNG test and an ENG test? 

An ENG (electronystagmography) test uses electrodes around the eyes to measure eye movements, while a VNG test uses infrared video goggles. VNG is more accurate, more comfortable, and is now the preferred standard in most modern clinics.

Q4. Can I drive after a VNG test?

 It is advisable not to drive immediately after the test, as some patients experience mild dizziness following caloric testing. Bring a companion if possible.

Q5. Who performs a VNG test?

 A trained audiologist, vestibular physiotherapist, or ENT specialist performs and interprets the VNG test. Results are often reviewed alongside a neurologist if central pathology is suspected.

Q6. How do I book a VNG test in Kolkata? 

You can book a VNG test in Kolkata by contacting audiology clinics or ENT departments in major hospitals. A referral from a general physician or ENT doctor is usually recommended but not always required.

Q7. Is VNG test covered under health insurance? 

Coverage varies by insurer and plan. Many health insurance policies cover diagnostic tests for neurological and ENT conditions — check your policy documents or call your insurer to confirm.