Pure tone audiometry is a test of hearing sensitivity involving threshold determination at varying frequencies. It mainly involves measurement of hearing levels across a wide frequency range with the help of an audiometer. Threshold is the lowest or softest audible tone and is measured in decibels(dB). Normal hearing range is 25dB or lower across 250Hz to 8kHz. Audiometry test is done in a quiet environment. During the test, patient is made to wear headphones and he hears a range of sounds differing in pitch and intensity. It is thus a noninvasive test. The results are plotted on a graph called audiogram. It is thus a basic test of hearing.
The results of the test are used to diagnose degree of loss (varying from mild to profound) or the type of loss whether neural(damage to nerve/cochlea) or conductive (ear drum or ossicles). It is also used to diagnose diseases of the ear or to monitor ill effects of ototoxic drugs and noise.
Thus after diagnosis of hearing impairement, PTA provides a guideline in whether hearing aids or surgery will improve one’s hearing.
What is audiometry?
Pure-tone threshold audiometry is the measurement of an individual’s hearing sensitivity for calibrated pure tones.
When audiometry is done?
Audiometry done to rule out hearing loss, to determine type of hearing loss, to prescribe hearing aid or as a pre employment health checkup
Who does audiometry?
A certified audiologist.
Is audiometry painful?
How much time it takes?
Approximately 20-30 minutes
When do you get the report?
At what age can a audiogram be done?
Audiogram can be done in any person more than 5-6 years of age who is cooperative
What is the test for hearing below 5 years?