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Audiogram

Definition

Audiogram is a graphical representation of audiometric studies performed to detect

hearing loss

Audiometry

Audiometry is the single most important diagnostic instrument to detect hearing loss.

Two kinds of audiometric testing :

Pure tone audiometry : sound stimulus : pure or musical tone
Speech audiometry : sound stimulus : spoken word

In pure tone audiometry the louder the tone before the patient perceives it the greater the hearing loss

In speech audiometry the ability to hear and discriminate sounds and words.

The audiometrist performs the test

The patient wears earphones and sits in a sound proof room and signals when he

hears a tone

Air conduction and bone conduction (applying the stimulus to the mastoid bone) both are tested

Responses are plotted on graph (audiogram)

Important chararacteristics in evaluation

Frequency
Pitch
Intensity

Normal human range

Range of frequency perceived 20 to 20,000 Hz.

Speech range of frequencies 500 to 2000 Hz.

A tone with 100 Hz - low pitch

A tone with 10,000 Hz - high pitch

The unit for measuring loudness is the decibel (dB),

Hearing loss is measured in decibels

Sounds louder than 80 dB - harsh to human ear and damaging to the inner ear.

The Normal and the Abnormal

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