5.7.3.3 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 4000Hz in each ear. If a patient
hears all the tones in each ear, the result would be considered a Pass. Failure to hear
even one of the tones in either ear would result in a Refer.
5.7.4 Automatic Threshold (Hughson-Westlake, MA 25e/MA 27e Only)
In addition to traditional manual testing, the MA 25e/MA 27e incorporates a Hughson-
Westlake patient controlled automatic threshold test complying with ISO8253. When the test
is completed the results are easily recalled from the internal memory of the MA 25e/MA 27e.
Hughson-Westlake is a procedure used to determine pure tone thresholds. The
MA 25e/MA27e utilizes this procedure to perform an automatic pure tone test procedure.
Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses obtained at a certain
level in a 10 dB decrease and 5 dB increase procedure. The device will re-test 1000 Hz
before moving to the next ear or ending the test.
Prior to testing, the following instructions should be given. "You will now hear a variety
of tones with various loudness levels, please push the response switch when you
hear a tone and release the button when you no longer hear it“. The patient response
can only be recorded during tone presentation.
The test frequencies will start at 1000 Hz and continue through those frequencies
activated within the settings.
To start the automatic test, press the Frequency Hz dial. This will change the Function
Key list to select HW with F4. For key selection see Table 8 in Section 5.5.2.
5.8 Tone Setup Menu
To access the Tone Setup menu press F1 and F4 simultaneously for 2-3
seconds. Once in the Menu (Figure 12), the different Setup options are listed and can
be entered using the function keys or the Frequency Hz dial. See Table 9 and Table
10 for further explanation.
Table 9 Explanation of Function Keys in Setup Menu
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