Vertigo testing usually starts with simple, hands-on maneuvers in a doctor’s office and may progress to specialized lab tests that track your eye movements and measure inner ear function. Most people get a diagnosis from the physical exam alone, especially if the cause is something common like loose crystals in the inner ear. More complex or persistent cases call for a battery of tests using goggles, warm and cool air, sound pulses, or imaging.
The Dix-Hallpike Maneuver
This is the single most common test for vertigo, and it’s often the first thing a doctor or specialist will do. You sit upright on an exam table, and the provider quickly lowers you backward so your head hangs slightly off the edge, turned to one side. The whole thing takes about 15 seconds, and the provider watches your eyes closely the entire time.
What they’re looking for is nystagmus, a specific involuntary jerking of your eyes. If the cause is the most common type of positional vertigo (posterior canal BPPV), they’ll see your eyes beat upward and rotate, with the top of the eye twisting toward whichever ear is pointing down. This eye movement typically starts after a brief delay, builds quickly in intensity, then fades within about a minute. The test is repeated with your head turned to the other side to check both ears.
If instead your eyes jerk only sideways with no rotational component, that points to a different variant involving the horizontal ear canal. The provider will confirm this with a “roll test,” where you lie flat and they turn your head side to side. These distinctions matter because each type responds to a different repositioning treatment.
The Head Impulse Test
This quick bedside test checks whether a reflex connecting your inner ear to your eye muscles is working properly. You focus on the provider’s nose while they make small, fast, unpredictable turns of your head, roughly 15 degrees in about a tenth of a second.
In a healthy vestibular system, your eyes stay locked on the target no matter which way your head moves. If one inner ear is damaged, your eyes get dragged along with the head turn and then snap back to the target with a visible corrective flick. That corrective eye movement is the clinical sign of a weak or damaged balance nerve on that side. This test is especially important in emergency settings, where providers use it alongside two other eye checks (together called the HINTS exam) to distinguish a harmless inner ear problem from something more serious like a stroke affecting the balance centers of the brain.
Videonystagmography (VNG)
If bedside tests don’t give a clear answer, the next step is usually a VNG, a more thorough lab test that records your eye movements with infrared cameras mounted in goggles. You sit in a darkened room while the goggles track every flicker of nystagmus your eyes produce. The test has three main parts.
In ocular testing, you follow moving lights with your eyes and stare at fixed targets without moving your head. This checks how well your brain coordinates eye movements on its own, separate from any inner ear input.
In positional testing, you move your head and body into various positions while the goggles record whether those positions trigger abnormal eye movements. This is essentially a more precise, camera-recorded version of the bedside maneuvers described above.
In caloric testing, each ear is tested individually with warm and cool stimuli (either water or air). Cool water at 30°C or cool air at 24°C is introduced into one ear canal, and the provider watches for a predictable pattern: your eyes should jerk away from that ear. Warm water at 44°C or warm air at 50°C should produce the opposite response, with your eyes jerking toward the stimulated ear. If one ear produces a much weaker response than the other, it signals damage to the vestibular system on that side. This is one of the few tests that can isolate left versus right inner ear function, which makes it extremely useful for pinpointing which ear is the problem.
VEMP Testing
Vestibular evoked myogenic potential testing uses loud sound pulses to measure how specific gravity-sensing organs inside each ear are functioning. There are two versions.
The cervical VEMP checks the saccule, a small organ in the inner ear that senses vertical motion. Electrodes are placed on the muscles along the side of your neck, and when a loud click or tone burst is played into your ear, those muscles produce a measurable electrical response. A weak or absent response suggests the saccule or its nerve isn’t working properly.
The ocular VEMP checks the utricle, which senses horizontal motion. Electrodes go below your eyes, and again a sound stimulus triggers a reflex response in the eye muscles. Together, these two tests give a detailed picture of parts of the balance system that other tests can’t easily reach. They’re particularly useful for diagnosing conditions like superior canal dehiscence, where a thin spot in the bone surrounding an inner ear canal causes vertigo triggered by loud sounds or pressure changes.
Computerized Dynamic Posturography
This test doesn’t look at your ears directly. Instead, it measures how well your brain combines information from your inner ears, your eyes, and the position sensors in your feet and joints to keep you standing upright. You stand on a special force plate that can tilt or shift beneath you while a visual surround in front of you may also move. Pressure sensors in the platform record every sway and correction your body makes.
The test cycles through different conditions, sometimes removing visual cues, sometimes making the floor unstable, to see which sensory system you rely on most and whether any of them are failing. This is particularly helpful for guiding rehabilitation. If the results show you’re overly dependent on vision for balance, for example, a vestibular therapist can design exercises that specifically train you to trust your inner ear signals again.
When Imaging Is Needed
Most vertigo is caused by inner ear problems and doesn’t require a brain scan. But certain red flags push providers toward imaging. MRI is the preferred tool when a central cause is suspected, meaning the problem might be in the brain rather than the ear. It can detect tumors in the back of the brain, small strokes affecting balance pathways, structural abnormalities, and areas of nerve damage from conditions like multiple sclerosis.
MRI is far more sensitive than CT for spotting small strokes in patients with dizziness. That said, a normal MRI taken very early after symptom onset doesn’t completely rule out a tiny stroke, since some are too small to appear on the initial scan. CT scans are sometimes used in emergency departments because they’re fast and can quickly identify bleeding in the brain as a rare cause of sudden vertigo.
How to Prepare for Vestibular Testing
If you’re scheduled for a VNG, VEMP, or posturography session, your clinic will likely give you a preparation list. The restrictions exist because many common substances can suppress the very eye movements and reflexes the tests are designed to measure.
You’ll typically need to stop caffeine and nicotine at least 12 hours before your appointment. Forty-eight hours before, you’ll need to avoid alcohol (including alcohol-containing cough medicines), antihistamines, sleep aids, sedatives, pain medications, and recreational drugs. These substances can dampen vestibular responses enough to produce misleading results.
If you’ve been on certain medications for longer than six months, such as antidepressants, anti-anxiety medications, or antipsychotics, you generally should not stop them before testing, as withdrawal effects could be worse than any impact on results. The same goes for any life-sustaining medications like insulin or blood pressure drugs. When in doubt, call the testing clinic ahead of time and read them your medication list so they can tell you exactly what to hold and what to keep taking.