What are the tests needed to determine if one needs a cochlear implant?
One needs a battery of tests to determine the hearing thresholds and the conductivity of the nerve and functioning of hair cells. These tests include OAE, ASSR, and behavioral or pure tone audiometry with and without aid, BERA, Tympanometry.
Based on findings of the above-mentioned tests, the decision is taken whether audiologically patient is a candidate for cochlear implant surgery or not.
Once it is decided that patient needs a cochlear implant then high-resolution CT scan and MRI with 3D reconstruction of the inner ear is done to see the state of the cochlea vestibular nerve and the state of the inner ear.