Checking for vertigo involves specific head and eye movement tests that provoke or reveal the involuntary eye jerking (called nystagmus) that confirms a vestibular problem. The most common and reliable office test, the Dix-Hallpike maneuver, takes under two minutes and can diagnose the most frequent type of vertigo on the spot. Some of these checks can be done at home, but others require a trained clinician to interpret what your eyes are doing during positional changes.
The Dix-Hallpike Maneuver
This is the gold-standard test for benign paroxysmal positional vertigo (BPPV), which accounts for the majority of vertigo cases. The American Academy of Otolaryngology recommends it as the first-line diagnostic tool for anyone suspected of having BPPV.
Here’s what happens: you sit on an exam table with your legs stretched out. Your provider turns your head 45 degrees to one side and asks you to keep your eyes open. Then they guide you to lie back quickly so your head hangs slightly off the edge of the table, with one ear pointing toward the floor. They support your head the entire time.
What they’re watching for is nystagmus, a rapid involuntary flickering of your eyes. If your eyes start jumping in a specific pattern after the position change, that’s a positive result, meaning tiny calcium crystals have dislodged inside your inner ear and are triggering false motion signals. The test is then repeated with your head turned the other direction to check the opposite ear.
What You Can Try at Home
A simplified version of the Dix-Hallpike can be done on a bed. Sit on the bed with a pillow positioned so it will rest under your shoulders when you lie back. Turn your head 45 degrees to one side, then lie back quickly. If the room seems to spin and you feel a surge of vertigo that lasts 10 to 30 seconds, that strongly suggests BPPV in the ear on the side you turned toward.
A few important safety notes. Have someone with you in case your vertigo flares badly mid-test. Don’t attempt this if you have neck or back problems, vascular conditions, or a history of retinal detachment. And keep in mind that a home test can hint at BPPV, but it can’t rule out more serious causes of vertigo. You won’t be able to observe your own nystagmus pattern, which is the key diagnostic information a clinician uses.
How Clinicians Tell Inner Ear From Brain Problems
Not all vertigo comes from the inner ear. A small but important percentage originates in the brain, sometimes from a stroke affecting the brainstem or cerebellum. Clinicians use a bedside screening called the HINTS exam to distinguish between these two categories. HINTS stands for head impulse, nystagmus, and test of skew.
In the head impulse test, the examiner asks you to stare at their nose while they quickly rotate your head to one side. If your eyes briefly lose the target and snap back to it (a corrective saccade), that points toward an inner ear problem, which is the more reassuring result. If your eyes stay locked on target with no correction needed, that’s actually the worrying finding, because it suggests the inner ear is fine and something in the brain may be causing the vertigo.
For the nystagmus portion, the clinician checks whether the direction of your eye flickering stays the same when you look in different directions. In inner ear vertigo, the nystagmus beats consistently in one direction. In brain-related vertigo, the direction changes when you shift your gaze. Finally, the skew test involves alternately covering each eye to check for vertical misalignment. If one eye drifts up or down when uncovered, that suggests a problem in the brainstem.
Any one of these three red flags (no corrective saccade, direction-changing nystagmus, or skew deviation) raises concern for a central nervous system cause and typically triggers urgent imaging.
Frenzel Goggles and Why They Matter
One challenge in vertigo diagnosis is that your eyes naturally suppress nystagmus when you focus on something. This means a clinician might miss subtle eye movements during a standard exam. Frenzel goggles solve this problem. They’re thick magnifying lenses (+20 diopters) with internal lighting that illuminate your eyes for the examiner while completely blurring your vision so you can’t fixate on anything.
This matters because some vestibular imbalances are mild or partially compensated. Over time, the brain recalibrates after inner ear damage, and the nystagmus may disappear during normal viewing. Removing visual fixation with Frenzel goggles can unmask a lingering asymmetry that wouldn’t show up otherwise. Clinicians sometimes combine these goggles with vigorous head shaking to provoke a brief burst of nystagmus that reveals which ear is the problem.
Videonystagmography (VNG) Testing
When bedside exams aren’t conclusive, or when your provider needs to measure which ear is affected and by how much, they may order a VNG test. This uses infrared goggles with built-in cameras to precisely track your eye movements during several subtests.
The ocular portion asks you to follow moving lights and stare at fixed targets without moving your head, measuring how well your brain coordinates eye tracking. The caloric portion tests each ear individually by running cool and then warm water or air into one ear canal. The temperature change stimulates the vestibular system on that side, and the goggles record whether your eyes respond symmetrically. A significant difference between the two ears indicates that one vestibular system is weaker.
Preparing for Vestibular Testing
If you’re scheduled for a VNG or similar evaluation, preparation matters. You’ll typically need to stop caffeine and nicotine 12 hours beforehand. Forty-eight hours before the test, you should stop taking antihistamines, anti-nausea medications, anti-dizziness drugs like meclizine, sleeping aids, alcohol (including alcohol-containing cough medicine), pain medications, and recreational drugs. All of these can suppress the vestibular responses the test is trying to measure.
One exception: if you’ve been on anxiety medication for longer than six months, don’t stop it before testing. Abruptly discontinuing those medications can cause its own problems, and your vestibular clinic will account for their effects.
What Different Results Mean
A positive Dix-Hallpike with characteristic nystagmus means BPPV, which is the most treatable form of vertigo. It’s typically resolved with repositioning maneuvers (like the Epley) that guide the displaced crystals back where they belong, often in a single session.
If the Dix-Hallpike is negative but you’re still having vertigo episodes, your provider will look at the pattern of your symptoms. Vertigo lasting seconds to a minute with position changes still suggests BPPV, possibly in a canal the standard test doesn’t capture well. Episodes lasting hours may point to conditions like Meniere’s disease or vestibular migraine. Continuous vertigo lasting days, especially with new onset, gets the most urgent workup because it could signal vestibular neuritis (an inner ear nerve inflammation) or, less commonly, a stroke.
VNG results showing a significant caloric weakness on one side confirm inner ear dysfunction in that ear, which helps guide treatment even when the cause isn’t BPPV. Normal VNG results in someone with vertigo symptoms may redirect the investigation toward migraine-related vertigo or other neurological causes that don’t show up on vestibular testing.