Hearing test

Hearing TestAUDIOMETRYAUDIOMETRY

Sound:

Sound is vibration transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing.

Frequency

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nsit

y

Loudness is measured in decibels (dB) - this is the force of sound waves against the ear. Here are approximate decibel levels for some everyday sounds:

  Sound waves cause the tympanic membrane (eardrum) to vibrate. Humans can hear sounds waves with frequencies between 20 and 20,000 Hz.

Hearing (Audition)

Outer Ear Middle Ear Inner Ear

Pre-Test Protocols

• Otoscopy• Complete test instructions

– “You are going to hear a series of beeping tones. Every time you hear a tone, press the button (raise your hand) as soon as you hear it then quickly release the button. No matter how faint the tone, press the button when you hear it.”

• Remove glasses, hats, large earrings, gum• Proper seating placement

Earphone Placement

• Remember; “RED ON RIGHT”• Diaphragm centered over ear canal• Headband on top of patients head• Cords draped down patients back• Fit snugly without squeezing

Type of Test

Air conduction• Outer Ear• Middle ear

Bone Conduction

•Inner Ear

Graphic AudiogramsGraphic Audiograms

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Frequency (Hz)

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Degrees of Hearing Loss

Normal Hearing -10 --- 25 dB HL

Mild Hearing Loss 30 --- 45 dB HL

Moderate Hearing Loss 50 --- 65 dB HL

Severe Hearing Loss 70 --- 85 dB HL

Profound Hearing Loss > 90 dB HL

Audiogram Configurations:Audiogram Configurations: Progressive noise-induced hearing loss

Write in Your Report

• Intensity & frequency of Sound.

• How can we hear?

• Anatomy of Ear.

• Type of hearing test.

• Example of hearing loss.