Doctors who specialize in hearing disorders (otologists or otolaryngologists), also called ENT physicians, use many tests to measure hearing loss or track down its cause. A tuning fork will help the physician determine if hearing loss is conductive or sensorineural. Audiometry is a test that measures hearing loss with an electronic device, while electrocochleography measures the activity of the inner ear and the auditory nerve. Along with the Auditory Brain Stem Response test, it's often used to find out whether babies and children have profound hearing loss. Neurological tests, a magnetic resonance imaging (MRI) test, or a computerized tomography (CT) scan may be performed to check for possible tumors.