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NOTE:
Although the printout will combine the right and left ear test results on the same audiogram
or table, the screen can display only the results from one ear at a time. Therefore, if an ear button (
R
or
L
) is selected while you are still testing a particular ear, the screen will change to a new audiogram.
If this happens, it is not possible to return to an incomplete audiogram to complete the test sequence.
Screening audiometry
1.
Carefully position the earphones over the individual
’
s ears so that the
red phone
covers the
right ear and the
blue phone
covers the left ear.
2.
Ensure that nothing is obstructing the earphones such as earrings, eye glasses or a hearing aid.
3.
Instruct the person being tested to raise a hand or a finger (or press the optional
Handswitch
)
whenever a tone is heard.
4.
Encourage the patient to respond even if he/she thinks a tone is heard.
5.
Select the ear to be tested with the
R
(right) or
L
(left) button.
6.
Select the desired screening intensity by rotating the
dB HL
knob to the appropriate position.
The American Speech Language and Hearing Association recommends 20 dB as the screening
level for school-age children.
7.
Select the starting frequency by pressing the or
Hz
buttons.
8.
Present the tone by pressing the
Present
bar.
9.
If the individual fails to respond, increase the intensity by 10 dB and try again. Press the
button at the intensity level where the individual responded.
10.
Continue the procedure for all the desired frequencies.
AUDIOMETRIC THRESHOLD
The GSI 39 provides two ways to perform Audiometric Threshold testing. The system can be used in a
Manual mode or an Automatic Hearing Level mode (
Auto HL mode
). In the Manual mode, the
intensity, frequency and presentation of the stimulus are controlled by the tester. In the Auto HL
mode, the system presents stimuli based on responses from the Patient Response switch.
Manual Threshold Audiometry
1.
Carefully position the earphones and select the ear to be tested.
2.
Familiarize the individual with the test procedure by presenting a tone of 40 dB HL at 1000 Hz.
3.
Decrease the intensity in 10 dB steps until the person no longer responds or until you reach 0
dB HL.
4.
When you believe the individual understands the procedure (i.e., raise your hand/finger when
you hear a tone) proceed with the test.
5.
Starting at the desired test frequency, present the tone for a period of one or two seconds.
6.
If a response is indicated,
a.
Decrease the intensity of this same test frequency by 10 dB and present the tone again for
