Welch Allyn REF 29400 User Manual

Page 37

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Welch Allyn OAE Hearing Screener Directions for Use 705353 Rev E

36

DPOAE Measurement-Based Stopping Rules per Test

The system default DPOAE protocol stops the test when the conditions for an overall test Pass or
Refer occur. For example, if the first 3 frequencies “Pass”, then the final frequency will not be
tested since the overall pass criterion is that 3 out of 4 frequencies must pass. Likewise, if the
first 2 frequencies “Refer” then the final two frequencies will not be tested since there is no chance
for an overall Pass result even if the final two frequencies Pass. This has the advantage of
shortening the test time.

If you would like the system to continue through all of the test frequencies rather than stopping
when conditions for an overall Pass or Refer are achieved, refer to the section entitled

Changing

the Default Protocol to Continue through All Frequencies.

DPOAE Pass or Refer Criteria

For an overall PASS result to display on the LCD at the completion of a DPOAE test when using
the DPOAE system default protocol, three of the four test F2 frequencies must meet the response
conditions defined for a PASS.

The PASS/REFER criteria incorporated into the screener are based on published data by Gorga,
Neely, Ohlrich, Hoover, Redner and Peters (1997)

1

. In Gorga et al’s study, hearing impairment

was defined as a behavioral, pure tone audiometric threshold of 25 dB HL or greater at a
particular frequency. The interested reader is referred to this study for more detailed information.

Changing the DPOAE Default Protocol to Continue through All
Frequencies


If you would like the system default DPOAE protocol to test all of the frequencies even after
conditions for an overall Pass or overall Refer are met, you can load a new default protocol into
your Welch Allyn OAE Hearing Screener.

1. Using Windows Explorer, open the directory C:\Program Files\Welch Allyn\OAE Hearing

Screener\WA OAE Load Software.

2. Delete the file named “default.adx”.
3. Locate the folder named “AA” and open it.
4. Select and copy the file named “default.adx” contained in the AA folder.
5. Return up one level to the WA OAE Load directory.
6. Paste the copied “default.adx” file into the WA OAE Load directory.
7. Exit Windows Explorer.
8. Connect the screener to the PC using the provided communication cable.
9. Launch the WA OAE Load program.
10. Select Start to load the firmware into the screener.


See Chapter 13 if you need additional instructions about how to install the WA OAE Firmware
onto the screener.




1. Gorga MP, Neely ST, Ohlrich B, Hoover B, Redner J, Peters J. (1997). From laboratory to clinic: a large scale study of
distortion product otoacoustic emissions in ears with normal hearing and ears with hearing loss. Ear & Hearing. 18: 6,
440-455.

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