Performing Tone Audiometric Tests; Pretest Set-Up And Instructions; Threshold Determination - Maico MA 27 Operation Manual

Operation Manual MA 27 / MA 27e

6 Performing Tone Audiometric Tests

6.1 Pretest Set-up and Instructions

Hearing threshold levels can be determined by presenting test
signals to the test subject with the included headphones (air
conduction – AC). The purpose of AC audiometry is to establish
the hearing sensitivity at various frequencies. The test can
specify the AC loss but cannot distinguish between abnormality
in the conductive mechanism and sensorineural mechanism.
The patient should sit at a distance of at least 1 m from the
device.
Eliminate any obstructions which will interfere with the
placement of the earphone cushions on the ear (i.e. hair,
eyeglasses).
Ensure that the headphones are positioned correctly: red side
on the right ear, blue side on the left ear. Adjust the headband
of the headphones so that the earphones are positioned at the
correct height (i.e. the sound output grid exactly facing the ear
canal).
Prior to hearing threshold level measurements, the following
instructions should be given. "You will now hear a variety of
tones with various loudness levels raise your left or right hand
when you hear the tone in the left or right ear".

6.2 Threshold Determination

The test normally starts at 1000 Hz on the patient's better ear
with the L/R switch adjusted accordingly. A procedure of "down
10 dB, up 5 dB" is typically utilized to establish a threshold at
each frequency.
8104818 Rev.2.0 15 04/16