This caloric study is used to evaluate the vestibular (valve) portion of the eighth cranial nerve (CN VIII). This test is performed by irrigating the external auditory canal with hot or cold water. Cold water will cause a rapid eye movement outwardly away from the ear being irrigated and warm water will cause a rapid eye movement inwardly toward the side of the ear being irrigated. This test may cause nausea and vomiting.
PREPARATION FOR TEST
Do not eat or drink anything prior to the test to decrease the chance of vomiting.
The rapid eye movements with the irrigation of the middle ear are normal.
Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.
MEANING OF TEST
Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.
OBTAINING THE TEST RESULTS
It is your responsibility to obtain your test results. Ask the lab when and how you will get your results.