Videonystagmography (VNG)
Reviewed
Videonystagmography (VNG) is a test that measures a type of eye movement that you can't control (nystagmus). It is used to find out if you have a disorder of the vestibular system (the balance system in your inner ear) or problems with the nerves or parts of your brain that are part of your sense of balance.
Preparation and collection
Your provider will let you know how to prepare for your test. You may need to avoid certain foods or medicines before your test. But don't stop taking any medicine without talking with your provider first.
Understanding this test
Use the reference interval and units printed by the laboratory that performed the test. A result outside that interval is not a diagnosis by itself, and a result inside it does not rule out every condition. Your symptoms, history, medicines, timing, and related tests can change what the result means.
- The test may make you feel dizzy for a few minutes.
- Some people have nausea for a short time during caloric testing, but vomiting is uncommon.
- You may want to plan to have someone bring you home in case the dizziness lasts longer.
What to do next
Your provider can explain what type of disorder you may have. You may need more tests, including other balance tests, to confirm your diagnosis. Treatment options depend on the type of balance disorder you have.
Evidence source
U.S. National Library of Medicine: Videonystagmography (VNG)