VNG Test in Las Vegas

02How to prepare, and why the medication rule is strict

Preparation here is more demanding than for the practice’s other studies, and one instruction is non-negotiable in a way patients often do not expect.

Eyes and face

No eye makeup, mascara or false lashes, because the cameras track the pupil and makeup interferes with it. Remove contact lenses; bring your glasses instead and expect not to wear them during the recording. If you have had eye surgery, wear a prosthetic eye, or have a condition affecting eye movement, tell us in advance, since any of those changes how the study is set up and interpreted.

Food, and the practical detail nobody mentions

Eat something light two hours or so beforehand rather than arriving either full or empty. A full stomach makes nausea worse during the provocative sections and an empty one makes light-headedness worse. That is a small point that materially affects how the appointment feels, and it is rarely included in preparation instructions.

What to bring

Your medication list, your referral if you have one, your glasses, and any prior balance or hearing testing as full reports. If your dizziness comes in episodes, a note of when they occur, how long they last and what brings them on is genuinely useful. Records can be requested through medical records, and coverage is verified before your appointment.

03What the appointment involves, section by section

You wear lightweight goggles containing infrared cameras. The room is darkened for parts of the study. The sections below are each short, and any of them can be paused.

Following targets with your eyes

You track a moving light or dot with your eyes while keeping your head still, and look between targets on command. This part is comfortable and tests the central pathways controlling eye movement, which is where a brainstem or cerebellar problem shows itself. It requires attention rather than tolerance.

Position changes

You are moved through a series of positions, lying back, turning your head to each side, sitting up. This is where benign paroxysmal positional vertigo declares itself, because displaced particles in the inner ear produce a burst of vertigo and a characteristic nystagmus in a specific position. If this reproduces your symptoms, that is a diagnostic result rather than a mishap, and it is also the section most likely to make you feel briefly unwell.

Caloric testing, the part worth explaining properly

Warm and cool air, or in some protocols water, is introduced into each ear canal in turn. Changing the temperature stimulates the balance organ on that side, and the resulting eye movement shows how well each side responds. This reliably produces a sensation of spinning for thirty seconds to a minute per ear. It is deliberate, it is the most informative part of the study because it tests each side independently, and it is the reason a driver matters. Being told in advance makes it manageable; discovering it mid-study does not.

Afterwards

Most patients feel normal within twenty to thirty minutes. Some feel unsteady, tired or mildly nauseated for a few hours. Plan a quiet rest of the day rather than returning to work immediately, and do not drive yourself. There is nothing to recover from medically; the effects are the balance system resettling.

04What the results establish, and what they do not

The output is a set of eye-movement recordings compared between sides and against expected patterns. Interpretation is a matter of pattern rather than a single number.

What a peripheral pattern looks like

Reduced response on caloric testing on one side indicates that ear’s balance organ is underperforming, which points to a peripheral cause. Positional testing reproducing vertigo with a characteristic nystagmus in a specific position indicates positional vertigo and identifies which ear and which canal, which matters because treatment is a mechanical repositioning manoeuvre directed at that specific canal, set out on the repositioning guide.

What points centrally instead

Abnormalities in the eye-tracking sections, nystagmus that changes direction with gaze, or patterns the inner ear cannot account for all suggest a central cause. That shifts the investigation toward the brainstem and cerebellum and usually toward imaging, coordinated with an outside facility. It also raises urgency in some circumstances, which is why the distinction is not merely academic.

A normal study is common and still informative

Many patients with genuine dizziness have a normal VNG. That is not a failure of the test or a suggestion the symptoms are imagined. It means the vestibular system tested within expected limits at that moment, which redirects attention toward causes this study does not measure: blood pressure and circulation, medication effects, cardiac rhythm, migraine-associated dizziness, and anxiety, which frequently accompanies dizziness of any cause and is worth treating rather than dismissing.

Why the affected side matters for rehabilitation

Where one balance organ is underperforming, the brain compensates over weeks by relying more on the other side and on vision and proprioception. Vestibular rehabilitation is built on driving that compensation deliberately with graded exercises, and knowing which side is affected shapes the programme. A patient sent for rehabilitation without that information is being treated generically for something that has a specific answer available.

What the study does not do

It does not test hearing, which requires audiometry, a different test for a different question. It does not image the brain. It does not diagnose migraine, though migraine is a common cause of episodic dizziness. And it does not measure how disabling your symptoms are, which is the thing you actually care about and which no eye-movement recording captures. The National Institute of Neurological Disorders and Stroke catalogues these as distinct disorders.

05Who the study suits, and when to be seen urgently instead

The study answers a specific question, and one group of patients should not be waiting for an appointment at all.

When it is clearly useful

Recurrent vertigo without an established cause. Dizziness where the history cannot distinguish inner ear from central. Suspected positional vertigo needing confirmation of which canal is involved. Persistent imbalance after a vestibular illness, where establishing whether one side remains underperforming guides rehabilitation. And unexplained dizziness in someone whose examination is otherwise unremarkable.

When something else comes first

Sudden severe dizziness with double vision, slurred speech, facial or limb weakness, severe headache or inability to walk is a medical emergency and belongs at an emergency department rather than in a scheduling queue. Dizziness with new hearing loss needs prompt assessment. And dizziness that is clearly positional and clearly benign can often be treated at a consultation without this study, which is worth knowing before booking a test you may not need.

Practical suitability

The study requires holding positions, tolerating provoked dizziness and having transport home. Where neck problems, severe anxiety or physical limitations make parts of it impractical, the protocol can often be modified, and saying so at booking is better than abandoning it partway. The American Academy of Neurology guidance recognises that a partial study honestly reported is more useful than a complete one poorly tolerated.

Why it is worth doing rather than guessing

Dizziness is treated empirically more often than almost any neurological symptom, frequently with medication that suppresses the sensation without addressing its cause and which, taken long-term, actually slows the balance system’s own compensation. Establishing which side is affected, or that neither is, changes that. It is the difference between managing a symptom indefinitely and treating a condition.

06VNG testing across Southern Nevada

Both CNS offices perform the study, so the appointment is at whichever address is the shorter drive. That matters more here than for any other study the practice performs, for a reason specific to this test.

Why the drive home is part of the planning

You should not be driving yourself, and whoever brings you is making the journey twice or waiting. A shorter distance therefore affects two people rather than one, and a patient who feels unsteady after caloric testing is better served by twenty minutes in a car than fifty. Choosing the closer office is part of the clinical plan rather than a convenience.

VNG test Henderson NV and Green Valley

Patients booking a VNG test Henderson NV attend the West Horizon Ridge Parkway office, just off the 215 Beltway. A VNG test Green Valley Henderson residents can reach quickly is almost always at that address, and the local guide is the videonystagmography guide.

VNG test Summerlin and the west valley

A VNG test Summerlin patients can reach most easily is performed at West Flamingo Road, which the 215 and Summerlin Parkway feed toward. Consultation, study and interpretation all happen at that one address.

VNG test North Las Vegas and Southern Nevada generally

A VNG test North Las Vegas patients need is performed at whichever office is the shorter drive, following the consolidation into two fully equipped sites; we will not imply a third exists. More broadly, a VNG test Southern Nevada patients are referred for is not widely available outside hospital and specialist settings, so having it in the same practice as the consultation removes a referral from a pathway where patients are often already frustrated by how long it has taken to be taken seriously. Coverage and any prior authorisation are verified before your appointment, with detail on the insurance page.