Reading an Audiogram. Air vs. Bone Conduction A/C  Via TDH-50P headphones Placed on Pinna  Checks the validity of entire ear system  Tests that ipsilateral.

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Presentation transcript:

Reading an Audiogram

Air vs. Bone Conduction A/C  Via TDH-50P headphones Placed on Pinna  Checks the validity of entire ear system  Tests that ipsilateral ear B/C  Bone vibrator Placed on Mastoid Process  Tests the validity of only the inner 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 dB is equal to one octave It is a Legal document 20

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 Tympanometry Acoustic Reflexes Speech Audiometry  Speech Reception Threshold (SRT)  Speech Discrimination (SD) ABR ECOCHG (Electrocochleography) OAE

What about Hearing Aids Minimal hearing loss  Probably no/little benefit Moderate hearing loss and usually sensorineural hearing loss are good candidates Profound hearing loss?  Could for environmental & safety reasons  Cochlear Implant

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