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audiogram (pure tone)

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  • pure-tone threshold audiometry is the measurement of an individual's hearing sensitivity for calibrated pure tones (1)
  • assesses hearing loss by air and bone conduction.
  • pure tone signals between 125Hz and 12kHz and at variable intensities are fed to the patient either via a vibrator applied to the mastoid process - for bone conduction - or via earphones - for air conduction. The intensity at which 50% of tones for a particular frequency are reported is charted as the threshold for that frequency on an audiogram.
  • the symbols used on most audiograms are:
      • x - left, air conduction
      • o - right, air conduction
      • ] - left, bone conduction
      • [ - right, bone conduction
  • its results have significant influence on the medical, legal, educational, occupational, social, and psychological outcomes (1)


  • degrees of Hearing Loss (2):
    Normal Hearing -10-26 dB
    Mild Hearing Impairment 27-40 dB
    Moderate Hearing Impairment 41-55 dB
    Moderately Severe Impairment 56-70 dB
    Severe Hearing Impairment 71-90 dB
    Profound Hearing Impairment >= 91 dB