After studying this chapter, you should be able to:
Discuss the automated testing technique Explain the Hughson-Westlake Method Understand and demonstrate a manual audiometry test Record the manual test results in numerical order
Key Terms / Abbreviations
Abbreviation
Explanation
HTL
Hearing Threshold Level
PLH
Percentage Loss of Hearing
Hz
Hertz - frequency
dB
Decibels or amplitude
Term / Abbreviation
Definition
Automated Testing Technique
This is an audiogram performed by the audiometer or computer program. A multitude of devices can be used to conduct pure tone audiometry, from conventional standalone audiometers, computer based and computer-controlled audiometers⁵. The same Hughson-Westlake method for manual testing is used by the software.
Descending
When the worker hears the tone – decrease the intensity with 10dB - softer.
Ascending
When the worker does not hear the tone – increase the intensity with 5dB – louder.
Malingering
When a worker responds even when not really hearing a tone, or responds at regular intervals without listening for the actual presentation of the tone.⁵
Manual Testing Technique
This method is done by an audiometrist on workers by presenting the tone, adjusting the frequency and dBs by hand. The method used is called the Hughson-Westlake or ascending method. (Also called the 10-down, 5-up method). This method is done to find the lowest intensity (dB level) at which the worker hears the tone and responds.
Reliability and Validity
The order of the frequencies tested is as follows: 1000Hz, 2000Hz, 3000Hz, 4000Hz, 6000Hz, 8000Hz, 500Hz and repeat 1000Hz. The re-test at 1000Hz serves as a reliability and validity test. If the results at 1 000Hz of the repeat measurement for that ear agree to 5dB or less with the first measurement for the same ear, the test is valid. If 10dB or more improvement or worsening in the hearing threshold level is discernible, retest at further frequencies in the same order until agreement to 5dB or less has been obtained (SANS 8253 -1:2011).
Sample sound
An example test sound given to the worker to determine understanding of the test procedure, done in the better ear, at 1000Hz and 50dB⁵
Screening audiometry
Audiometric tests that are usually conducted in the field, to identify possible referral threshold shifts.⁵
Specifically for bookings for a group of minimum 10 learners
The training program includes a pre-learning phase that allows participants to familiarize themselves with foundational concepts before engaging in in-person interactions with the facilitator.
Following the pre-learning phase, participants will have the opportunity to meet with the facilitator in a physical classroom setting. This direct interaction is crucial for addressing any questions or concerns that may have arisen during the self-study period.
Additionally, the physical classroom component is designed to facilitate hands-on practical training. This aspect of the program allows participants to apply theoretical knowledge in real-world scenarios, enhancing their understanding and retention of the material. Working under the guidance of an experienced facilitator, learners can practice skills, collaborate with peers, and gain valuable insights that are difficult to achieve through online learning alone.
Overall, this structured approach—combining pre-learning with direct facilitator contact and practical classroom experiences—ensures a comprehensive and effective learning journey that accommodates various learning styles and maximizes participant engagement.
Blended Learning
Self-pased learning combined with weekly online contact sessions with a facilitator and in-person practical training days
This combination allows learners to work through the theory at their own pace while still interacting with instructors on a weekly basis through regular question and answer online contact sessions.
The online part is flexible, letting learners study whenever it works best for them.
Live sessions help build a sense of community and support.
The in-person classes are important for hands-on learning, giving learners the chance to practice their skills with guidance from experienced mentors.
This well-rounded approach improves learning by meeting different learning styles and preferences.
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