A pure-tone air conduction hearing test determines the faintest tones a person can hear at selected pitches (frequencies), from low to high. During this test, earphones are worn so that information can be obtained for each ear.
The person taking the test may be asked to respond to the sounds in a variety of ways, such as by:
- Raising a finger or hand
- Pressing a button, pointing to the ear where the sound was received
- Saying “yes” to indicate that the sound was heard
The results are recorded in an audiogram.
If there is a blockage, such as wax or fluid, in the outer or middle ears, a method called pure- tone bone conduction testing may be used. With this technique, the blockage is bypassed by sending a tone through a small vibrator placed behind the ear (or on the forehead). The signal reaches the inner ear (or cochlea) directly through gentle vibrations of the skull. This testing can measure response of the inner ear to sound independently of the outer and middle ears. In these cases, this test helps the Specialist determine the type of hearing loss being measured.