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Audiogram Interpretation

Feb 24, 20252 min read

Value of Audiograms

  • Type of Hearing Loss: Site of the lesions
  • Degree of Hearing Loss: Threshold
  • Configuration of Hearing Loss: Etiology
  • Pre and Post Operation: Success
  • Hearing Aid Fitting: Rehabilitation
  • Hearing Screening: Prevention of hearing loss in noisy environments
  • Medico-Legal Purpose

Reading PTA

  • Types.

  • Degree.

  • Air conduction assesses entire system.

  • Bone conduction assesses cochlea.

  • Air-bone gap (>10)

Types of Hearing LossZ

  • Normal Hearing
    • positive renne, negative = conductive Conductive Hearing Loss
    • Causes in external ear, TM, or middle ear
    • Air decreased, Air-Bone gap present
    • bone conduction negative renne weber (osteosclerosis, cholestestoma)

Sensorineural Hearing Loss

  • Causes in inner ear, acoustic nerve, or central
  • Both Air and Bone decreased, no Air-Bone gap

Mixed Hearing Loss

  • Both Air and Bone decreased, Air-Bone gap present
  • old age with perforation, meinner disease with wax.

Y

Degree 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

Configuration of Hearing Loss

  • Rising
  • Flat
  • Sloping

Noise-Induced Hearing Loss

  • Maximum around 4kHz (notch)
  • May have tinnitus but may be subclinical
  • One side may be more affected than the other

Charts audiology

Graph View

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