Transcript
Hearing TestAUDIOMETRYAUDIOMETRY
Sound:
Sound is vibration transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing.
Frequency
Inte
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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500 1000 2000 3000 4000 6000
Frequency (Hz)
dB
Hea
ring L
evel
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.
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