The Hughson-Westlake Method in Audiometric Testing: Why It Is Used for Workplace Hearing Assessments
Understanding the recognised method behind occupational hearing tests
Workplace hearing tests are an important part of managing noise exposure and preventing occupational hearing loss.
Industries including mining, construction, manufacturing, transport and heavy industry regularly expose workers to hazardous noise levels. Employers use occupational audiometric testing to monitor worker hearing and identify changes that may be associated with workplace noise exposure.
A key part of accurate audiometric testing is the method used to determine a worker’s hearing thresholds.
The Hughson-Westlake method is one of the most widely recognised approaches used by trained audiometric testers to obtain reliable pure-tone hearing thresholds.
What Is the Hughson-Westlake Method?
The Hughson-Westlake method is a modified pure-tone audiometry technique used to determine the softest level at which a person can hear specific sounds at different frequencies.
During the test, the worker listens to tones presented through headphones and responds whenever they hear a sound.
The tester adjusts the sound levels using a structured approach to identify the worker’s hearing threshold.
The method uses a "down 10 dB, up 5 dB" approach:
The tone level is reduced when the worker responds
The tone level is increased when the worker does not respond
The process continues until the hearing threshold is established
This systematic approach helps improve consistency between tests and between different testers.
Why Is the Hughson-Westlake Method Important?
A hearing test is only useful if the results are reliable.
Small differences in testing technique can affect the accuracy of an audiogram. The Hughson-Westlake method provides a consistent procedure for measuring hearing thresholds.
Reliable audiometric results are important because they help employers and health professionals:
Establish baseline hearing levels
Monitor changes over time
Identify possible noise-related hearing changes
Determine whether further assessment may be required
Is Hughson-Westlake the Gold Standard for Audiometric Testing?
The Hughson-Westlake method is widely recognised as a standardised and reliable method for determining hearing thresholds in pure-tone audiometry.
However, the quality of an audiometric test does not depend on the method alone.
Accurate occupational hearing testing also requires:
Correctly calibrated audiometric equipment
A suitable testing environment
Competent trained testers
Correct worker instructions
Consistent test procedures
Australian guidance for occupational audiometry outlines competency requirements for people conducting workplace auditory assessments, including knowledge of audiometric equipment, testing techniques, interpretation of results and noise-induced hearing loss.
How Does Audiometric Testing Help Prevent Noise-Induced Hearing Loss?
Noise-induced hearing loss (NIHL) is one of the most common occupational health concerns in industries where workers are exposed to high noise levels.
Noise damage can occur gradually, meaning workers may not notice changes in their hearing until significant damage has occurred.
Regular workplace hearing tests allow employers to monitor hearing over time.
Occupational audiometric testing can help identify:
Changes from a worker’s baseline hearing level
Possible noise-related hearing changes
Workers who may require further assessment
Whether existing noise controls are effective
What Happens During an Occupational Audiometric Test?
A workplace hearing test generally involves:
1. Worker history
The tester may discuss:
Previous noise exposure
Use of hearing protection
Current workplace noise exposure
Previous hearing issues
2. Otoscopic examination
The ears may be checked to identify obvious issues that could affect testing.
3. Pure-tone audiometry
The worker wears headphones and responds when they hear tones at different frequencies.
The test measures hearing thresholds, usually across frequencies important for identifying hearing changes related to noise exposure.
4. Results review
The audiogram is reviewed to determine whether any changes require further investigation.
How Does Audiometric Testing Relate to Australian Workplace Standards?
For Australian workplaces, occupational hearing assessments are guided by the AS/NZS 1269 series, including:
AS/NZS 1269.4 – Occupational noise management, Part 4: Auditory assessment
This standard provides guidance around workplace auditory assessment procedures, competency requirements and the management of audiometric testing programs.
Employers implementing workplace hearing conservation programs should ensure their testing processes align with relevant Australian requirements.
Workplace Hearing Tests for NSW Businesses
Accurate hearing testing is not just about completing an audiogram.
The reliability of results depends on:
The testing method used
Equipment quality
Tester competency
Correct procedures
Compliance with workplace requirements
The Hughson-Westlake method provides a structured approach to obtaining reliable hearing thresholds and remains an important part of occupational audiometric testing.
