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Reading an Audiogram
Air vs. Bone Conduction
 A/C
 Via TDH-50P headphones
 Placed on Pinna
 B/C
 Bone vibrator
 Placed on Mastoid Process
 Checks the validity of
entire ear system
 Tests the validity of only the
inner ear
 Tests that ipsilateral ear
 Tests better cochlea
Things to know about an Audiogram
Lo to Hi Frequency (abscissa)
125 Hertz to 8000 Hertz
Octave and half-octaves
Lo to Hi dB (ordinate)
-10 dB HL to 120 dB HL
Each 20 dB is equal to one octave
It is a Legal document
The Legend
Ranges of Hearing Loss
 -10 – 25 dB HL = Normal range
 26 – 40 dB HL = Mild hearing loss
 41 – 55 dB HL = Moderate
 56 – 70 dB HL = Moderately Severe
 71 – 90 dB HL= Severe
 Greater than 90 dB HL = Profound
Normal Hearing
Conductive Hearing Loss
Sensorineural Hearing Loss
Mixed Hearing Loss
Other “Hearing” Tests
Acoustic Reflexes
Speech Audiometry
 Speech Reception Threshold (SRT)
 Speech Discrimination (SD)
ECOCHG (Electrocochleography)
What about Hearing Aids
Minimal hearing loss
Probably no/little benefit
Moderate hearing loss and usually
sensorineural hearing loss are good
Profound hearing loss?
Could for environmental & safety reasons
Cochlear Implant