Audiometry

Audiometry is another method of assessing the patients hearing levels. This test is normally carried out by an audiologist and is conducted in a sound proof room. The audiometer will then provide sounds at different frequencies to a set of headphones that the patient is wearing. The head phones will be used to assess AIR CONDUCTION. There is also a small metal vibrator attached to the head unit which will be placed on the mastoid to assess BONE conduction. When assessing bone conduction it is important to mask the other ear so that the patient does not misinterpret sounds heard from that ear.The audiologist then "plots" the recorded sounds that the patient responds to on a graph, known as an audiograph. Only the quietest sound that the patient can hear is plotted.

Audiographs record hearing loss in decibels (dB) and it must be remember that this is a LOGARITHMIC scale.

Different symbols are allocated depending on the type of conduction and which ear you are referring to.

Conduction Medium

Left

Right

Air conduction

X

O

Bone conduction

]

[

See examples below:

NORMAL AUDIOGRAPH

SENSORINEURAL HEARING LOSS AUDIOGRAPH

CONDUCTIVE HEARING LOSS AUDIOGRAPH

The video below shows you the what the room looks like. It must be soundproof.