Audiometry- Hearing Testing
Hearing Loss is a common symptom. Once patients come with a history of hearing impairment, the simplest and most common hearing test that is carried out is the Pure Tone Audiogram (PTA). It is so-called because an instrument (Audiometer) is used to produce Pure Tones at different frequencies - these are then presented to the subject at different sound levels (Volume) and the patient's hearing is recorded. TEST METHOD The test is carried out in a soundproof chamber to elicit an accurate response. It is preferably carried out in a two-room setting with the Tester and the Tested in a different room. Two different responses are tested Air Conduction - tested with Headphones Bone Conduction- tested with a Bone Vibrator The Bone Vibrator and the Headphones are snuggly fitted and the test is started by producing sound - usually starting at 1000 Hz at 25 dB. The tested is instructed to press a button when a sound is heard. The frequencies are then tested one by one and a graph is plot