Diagnostic Services Pure Tone Audiometry (Standard Hearing Test) This test determines the level at which a person detects sound at different frequencies. Speech Discrimination Testing This test determines how well speech is understood. This test is very helpful in determining if problems exist beyond the hearing nerve and gives insight as to how well hearing aids can help. Immittance Testing This procedure evaluates middle ear function by assessing how well the eardrum and middle ear bones move. This test is very useful in determining the location of a problem. Otoacoustic Emissions (OAE) These tests measure the health of the inner ear, the hearing nerve, and the function of the cochlea. Vestibular/ Balance Function Testing Electronystagmography (ENG) and Videonystagmography (VNG) are tests used to evaluate the balance system and assist in the assessment of the cause for dizziness.