Reading an audiogram
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The document discusses how to read an audiogram and the different types of hearing tests. It explains the differences between air and bone conduction tests and what parts of the ear each tests. It also outlines the ranges of frequencies and decibel levels measured on an audiogram as well as common types of hearing loss such as conductive, sensorineural, and mixed. Finally, it notes which levels of hearing loss are most likely to benefit from hearing aids and for those with profound loss, cochlear implants may be an option.
Reading an audiogram
- 2. Air vs. Bone Conduction ļ¬ A/C ļ” Via TDH-50P headphones ļ¬ Placed on Pinna ļ” Checks the validity of entire ear system ļ” Tests that ipsilateral ear ļ¬ B/C ļ” Bone vibrator ļ¬ Placed on Mastoid Process ļ” Tests the validity of only the inner ear ļ” Tests better cochlea
- 3. Things to know about an Audiogram ļ¬Lo to Hi Frequency (abscissa) ļ” 125 Hertz to 8000 Hertz ļ” Octave and half-octaves ļ¬Lo to Hi dB (ordinate) ļ” -10 dB HL to 120 dB HL ļ¬Each dB is equal to one octave ļ¬It is a Legal document 20
- 4. The Legend
- 5. Ranges of Hearing Loss ļ¬ -10 ā 25 dB HL = Normal range ļ¬ 26 ā 40 dB HL = Mild hearing loss ļ¬ 41 ā 55 dB HL = Moderate ļ¬ ļ¬ 56 ā 70 dB HL = Moderately Severe ļ¬ 71 ā 90 dB HL= Severe ļ¬ Greater than 90 dB HL = Profound
- 10. Other āHearingā Tests ļ¬Tympanometry ļ¬Acoustic Reflexes ļ¬Speech Audiometry ļ” Speech Reception Threshold (SRT) ļ” Speech Discrimination (SD) ļ¬ABR ļ¬ECOCHG (Electrocochleography) ļ¬OAE
- 11. What about Hearing Aids ļ¬Minimal hearing loss ļ” Probably no/little benefit ļ¬Moderate hearing loss and usually sensorineural hearing loss are good candidates ļ¬Profound hearing loss? ļ” Could for environmental & safety reasons ļ” Cochlear Implant