When this test is done to patients in a hospital, the patient is lying in bed on his back facing upward towards the ceiling. Ice cold water, 60 ml total, is introduced into one ear canal using a syringe. This is repeated in the other ear canal. The water runs out into a basin placed outside the ear to keep the bed dry. Severely brain damaged patients do not have any reaction to this test. This is a test used in examining patients undergoing brain death evaluation, so they are already on a ventilator.