Operation Manual MA 28
8506915 Rev. 3
24
15/11/2017
5.5.3 Placement of Eartips (for Testing with Insert Phones Only)
Figure 12
First, place the eartip securely on the white adapter at the
end of the insert earphone tubing. To prepare the foam
eartip for insertion in the ear canal, you must compress the
foam by rolling it in your fingers to narrow its diameter
(Figure 12). Check to be sure that the foam does not
obstruct the opening of the black sound tube.
Figure 13
Quickly, while the foam is still compressed, grasp the
patient’s ear and gently pull it up and back to open and
straighten the ear canal. While holding the canal open, slide
the compressed foam ear tip into the ear canal. The foam
should be completely surrounded by the canal with virtually
none of the foam sticking out of the canal (Figure 13).
5.6 Performing Tone Audiometric Tests
5.6.1 Air Conduction Testing
5.6.1.1 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 conductive versus a sensorineural
abnormality.
5.6.1.2 Threshold Determination
The test normally starts at 1000 Hz on the patient's better ear. Select
Right
/
Left
(
F2
key). A procedure of
“down 10 dB, up 5 dB
” is typically utilized to establish a threshold
at each frequency.
NOTE:
There is a safety feature within the device so that high volumes (i.e. 100 dB or
more) are not accidently presented to a patient. When the volume of the tone or noise is
75 dB or higher and the user changes frequencies or ears, the device will automatically
reset the level to 70 dB.
5.6.1.3 Screening
A hearing screening utilizes a
Pass
or
Refer
result and is used to determine if further
testing is required as a hearing problem may exist. Patients are typically screened at
a level of 20 dB HL at 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz in each ear. If a patient
hears all the tones in each ear, the result would be considered a
Pass
. Failure to hear
any of the tones in either ear would result in a
Refer
.
NOTE
: This is an example of one screening protocol. Each state may have their own
screening protocol. Contact your state health department for guidelines in your area.
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