An audiogram is a painless, noninvasive hearing test that detects hearing loss caused by tumors, such as an acoustic neuroma, near the cochlear nerve. The test is performed by an audiologist, who places earphones over the subject’s ears.

During the first portion of the test, the subject will hear a range of sounds at different tones directed to one ear at a time. This part of the test will determine the individual’s ability to hear.

The audiologist also will assess speech discrimination, the individual’s ability to identify single-syllable words. The test can detect whether an individual has hearing loss that is sensorineural (from nerve damage) or conductive (from eardrum or ossicle damage).