1. Reading an Audiogram

2. 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

3. 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

4. The Legend

5. 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

6. Normal Hearing

7. Conductive Hearing Loss

8. Sensorineural Hearing Loss

9. Mixed Hearing Loss

10. Other “Hearing” Tests Tympanometry Acoustic Reflexes Speech Audiometry  Speech Reception Threshold (SRT)  Speech Discrimination (SD) ABR ECOCHG (Electrocochleography) OAE

11. 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