Tympanometry measures should not be interpreted in isolation. Tympanometry is part of a complete test battery and outcomes from other audiological tests should be considered in conjunction with these results.

The following provides a broad interpretation of typical Tympanograms by type and possible related pathologies and are based on Adult Probe Frequency 226Hz.

Typical Normative Data for an Adult (BSA Guidelines 2013)

  • Admittance / Compliance between 0.3 to 1.6 cm3 (‘Y’ Axis)
  • Middle Ear Pressure +50 to -50 daPa (Deca Pascal) (‘X’ Axis)
  • Ear Canal Volume (ECV) 0.6 to 2.5 cm3

Type A Tympanogram

Tympanogram Type As

Tympanogram Type Ad

Tympanogram Type B

Effects of Otitis Media

Type C Tympanogram

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