pure tone audiometry

PURE TONE AUDIOMETRY

Definition: This test gives a qualitative and quantitative analysis of patients hearing. The frequency range tested in 125 Hz to 8000 Hz.

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Aims of audiometry:
  1. Analysis of the patients hearing loss. (conductive hearing loss, sensorineural hearing loss or mixed).
  2. For pre-operative and post-operative evaluation.
  3. Medico-legal purposes.
  4. For prescription of hearing aid.
  5. In malingering patients.
Procedure: It is carried out in a sound proof room. Air conduction thresholds for frequencies up-to 125, 250, 500, 1000, 2000, 4000 and 8000 Hz and bone conduction thresholds for 250, 500, 1000, 2000 and 4000 Hz are done. The patient is told to raise his finger or give a signal when he appreciates the slightest sound.
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Inference:
  1. The intensity of sound raised above the normal level is directly proportional to the degree of hearing loss.
  2. The bone conduction hearing is indicative of cochlear function.
  3. The difference between the thresholds of air and bone conduction is a measure of conductive hearing loss.
  4. The audiometer is calibrated such that a normal person would have an air bone gap within 20db with bone conduction higher than air conduction.
  5. Sensorineural hearing loss shows reduction in threshold of both bone conduction and air conduction.

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