Audiology
Alternate Names : Audiography (Audiogram), Audiometry, Hearing Test
Definition
An audiology exam tests your ability to hear sounds. Sounds vary according to the intensity (volume or loudness) and the tone (the speed of sound wave vibrations).
Hearing occurs when sound waves are conducted to the nerves of the inner ear and from there to the brain. Sound waves can travel to the inner ear by air conduction (through the ear canal, eardrum, and bones of the middle ear) or bone conduction (through the bones around and behind the ear).
INTENSITY of sound is measured in decibels (dB):
- A whisper is about 20 dB
- Loud music (some concerts) is around 80 to 120 dB
- A jet engine is about 140 to 180 dB
Usually, sounds greater than 85 dB can cause hearing loss in a few hours. Louder sounds can cause immediate pain, and hearing loss can develop in a very short time.
TONE of sound is measured in cycles per second (cps) or Hertz:
- Low bass tones range around 50 to 60 Hz
- Shrill, high-pitched tones range around 10,000 Hz or higher
The normal range of human hearing is about 20 Hz to 20,000 Hz, and some animals can hear up to about 50,000 Hz.
Pictures & Images
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• Pictures & Images
• Definition
• Why is the Test Performed?
• How is the Test Performed?
• How to Prepare for the Test?
• How will the Test Feel?
• Normal Values
• What do Abnormal Results Mean?
• Special Considerations
• Risks
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Topics that might be of interest to you Diseases & Conditions
• Acoustic Neuroma
• Acoustic Trauma
• Age-Related Hearing Loss
• Alport Syndrome
• Labyrinthitis
• Meniere's Disease
• Occupational Hearing Loss
• Otitis Media - Chronic
• Otosclerosis
• Ruptured or Perforated Eardrum
Tests & Exams
• EEG
Other Topics
• Adolescent Test or Procedure Preparation
• Head Injury
• Hearing Loss
• Infant Test/Procedure Preparation
• Preschooler Test/Procedure Preparation
• School Age Test/Procedure Preparation
• Toddler Test/Procedure Preparation
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