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Hearing occurs when sound waves stimulate the nerves of the inner ear. The sound then travels along nerve pathways to the brain.

Sound waves can travel to the inner ear through the ear canal, eardrum, and bones of the middle ear (air conduction). They can also pass through the bones around and behind the ear (bone conduction).

The INTENSITY of sound is measured in decibels (dB):

  • A whisper is about 20 dB
  • A jet engine is about 140 - 180 dB



  • Low bass tones range around 50 - 60 Hz


How is the Test Performed?

The first steps are to see whether you need an audiogram. The procedure most often involves blocking one ear at a time and checking your ability to hear whispers, spoken words, or the sound of a ticking watch.


Audiometry provides a more precise measurement of hearing. For this test, you wear earphones attached to the audiometer. Pure tones of controlled intensity are delivered to one ear at a time. You are will be asked to raise a hand, press a button, or otherwise indicate when you hear a sound.

The minimum intensity (volume) required to hear each tone is graphed. A device called a bone oscillator is placed against the bone behind each ear (mastoid bone) to test bone conduction.

Preparation for the Test

No special steps are needed.

How the Test will Feel


Why is the Test Performed?

This test can detect hearing loss at an early stage. It may also be used when you have hearing problems from any cause.

Common causes of hearing loss include:

Normal Results for Audiometry


What Abnormal Results Mean


The amount and type of hearing loss may give clues to the cause, and chances of recovering your hearing.

The following conditions may affect test results:

Audiometry Risks

There is no risk.







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Review Date: 8/4/2014

Learn more about Audiometry