Introduction: Planning for Your Testing Throughput

When planning an audiometric testing program, one of the first questions WHS managers ask is: “How many workers can we test in a day?” The answer determines whether your program requires a single testing day or a multi-day commitment, affects scheduling logistics, and has direct cost implications.

This guide explains the factors that determine daily testing capacity and provides practical tools to estimate how many testing days you’ll need.

Single-Booth Testing Capacity: 20-30 Workers Per Day

The Standard Single-Booth Scenario

A mobile audiometric van with a single sound-attenuating booth can test approximately 20-30 workers per day, depending on conditions. This is based on:

• Continuous 8-10 hour testing window
• Back-to-back worker scheduling with no extended breaks
• Workers arriving on time and ready to test
• No significant operational disruptions (noise events, facility issues)

Why Not More?

You might assume that testing could move faster — after all, a hearing test only takes a few minutes, right? The reality is more complex. The 12-15 minutes per worker includes mandatory procedures and necessary transition time that can’t be accelerated without compromising testing quality.

Time Per Worker Breakdown: 12-15 Minutes Standard

Registration: 2 Minutes

Each worker confirms their identity, reviews their hearing health history, and signs consent for testing. The audiometrist captures any relevant information (previous hearing loss, current symptoms, medical history affecting hearing).

Quiet Period: 5 Minutes

Before pure-tone testing, workers must observe a quiet period to allow their hearing system to stabilize. This is a mandatory component of AS/NZS 1269.4 testing. Workers sit quietly, avoiding conversation and mental stimulation (no mobile phones, audio devices, or engagement in complex tasks).

Why 5 minutes? Research shows that temporary threshold shift (a temporary elevation in hearing thresholds from recent noise exposure) resolves within approximately 5 minutes of quiet rest. This ensures that the baseline or comparison audiogram reflects the worker’s true hearing status, not temporary noise effects.

Pure-Tone Audiometric Testing: 5-8 Minutes

The actual hearing test involves:

• Earphone placement and comfort check (1 minute)
• Test instructions and worker practice response (1-2 minutes)
• Testing at multiple frequencies: 500 Hz, 1000 Hz, 2000 Hz, 3000 Hz, 4000 Hz, 6000 Hz, 8000 Hz, usually bilaterally (3-5 minutes)
• Quality assurance checks if any response pattern is unusual (variable additional time)

Total testing time: 5-8 minutes depending on worker cooperation and response consistency.

Result Review and Discussion: 2-3 Minutes

Once testing completes, the audiometrist:

• Reviews the results with the worker in plain language
• Compares current results to baseline if available
• Explains any referral recommendations
• Answers questions

Total Per Worker: 12-15 Minutes

Adding registration (2) + quiet period (5) + testing (5-8) + review (2-3) = 14-18 minutes total.

In practice, averaged across all workers, 15 minutes per worker is a reliable estimate for planning purposes.

Dual-Booth Capacity: 40-60+ Workers Per Day

How Dual Booths Improve Throughput

A mobile van with two sound-attenuating booths can approximately double daily capacity to 40-60+ workers per day. How?

Workflow optimization: While one worker is being tested in booth one, the audiometrist can be conducting the quiet period and registration for the next worker in booth two. This pipeline approach reduces idle time and increases efficiency.

Practical Example: Dual-Booth Workflow

1. Worker A: Registration + quiet period (7 minutes)
2. Worker B: Simultaneously in booth two, beginning testing while Worker A continues quiet period
3. Worker B: Complete testing (5-8 minutes)
4. Worker B: Review and discussion while Worker A moves to testing booth
5. Worker A: Testing begins while next worker begins registration
6. Cycle repeats, with continuous worker flow

Realistic Dual-Booth Throughput

While theoretical capacity is high, practical factors limit throughput:

• Worker availability and no-shows
• Setup and breakdown time at beginning and end of day
• Lunch and comfort breaks
• Operational disruptions or facility noise events

Conservative estimate: 40-50 workers per day with dual booths. Optimistic estimate: 50-60+ workers under ideal conditions.

How to Plan Testing for Large Workforces

The Calculation Formula

Number of testing days required = Total workers ÷ (capacity per day)

Single-Booth Example: 100-Worker Cohort

100 workers ÷ 25 workers per day = 4 days required

Schedule: Monday 25 workers, Tuesday 25, Wednesday 25, Thursday remaining workers and reschedules

Dual-Booth Example: 100-Worker Cohort

100 workers ÷ 50 workers per day = 2 days required

Schedule: Monday 50 workers, Tuesday 50 workers

Large Cohort Example: 250-Worker Mining Camp

250 workers ÷ 50 workers per day (dual booth) = 5 days required

Or: 250 ÷ 25 (single booth) = 10 days required

Multi-Site Example: 500 Workers Across Three Locations

Site A: 150 workers = 3 days (dual booth)

Site B: 200 workers = 4 days

Site C: 150 workers = 3 days

Total: 10 days across three separate van deployments or multiple trips

Scheduling Testing Across Shifts

Extending Testing Hours for Multi-Shift Operations

For 24/7 operations (manufacturing, utilities, emergency services), testing can extend beyond a single shift:

• Morning shift: Test end of shift (3-4 PM), testing 20-30 workers
• Afternoon shift: Test start of shift (2-3 PM) or designated break period, testing 20-30 workers
• Night shift: Test early morning after shift (6-8 AM) or designated day off, testing 20-30 workers

Strategic Scheduling

Coordinate with operations managers to identify periods of lowest operational impact:

• Maintenance shutdowns
• Production changeovers
• Shift handover periods
• Designated safety days or training blocks

Maximum Practical Throughput: Reality vs. Optimism

Why Can’t We Test Faster?

Some organisations wonder whether the audiometrist could skip the 5-minute quiet period or compress testing to accelerate throughput. The answer is no — these aren’t just procedural steps; they’re essential to testing validity.

The 5-Minute Quiet Period is Mandatory

AS/NZS 1269.4 requires a quiet period before testing to stabilize hearing thresholds. Skipping this invalidates the results. Attempting to “speed up” by omitting this step compromises compliance and accuracy.

Testing Time Reflects Biological Reality

Pure-tone testing takes 5-8 minutes because the audiometrist must systematically present tones, confirm threshold responses, and ensure consistent, valid responses. Rushing this phase leads to unreliable data.

Realistic Maximum: 60 Workers Per Day

Under optimal conditions (dual booths, continuous back-to-back scheduling, no disruptions, high worker compliance), 60 workers per day is achievable. However, 40-50 workers per day is a more sustainable and realistic target for planning purposes.

Planning for No-Shows and Rescheduling

No-Show Rates by Testing Model

• On-site testing with good communication: 5-15% no-show rate
• On-site testing with poor communication: 15-30% no-show rate
• Clinic-based testing: 30-40% no-show rate

Planning for Reschedules

For a 100-worker on-site program with expected 10% no-shows, plan for 10 workers needing rescheduling. This requires either:

• Building buffer days into the testing schedule
• Scheduling reschedule sessions within 2-4 weeks of initial testing
• Identifying specific rescheduling windows during the initial booking

Factors Affecting No-Show Rates

• Quality of advance communication (specific appointment times are better than vague notifications)
• Perceived relevance (workers more likely to attend if they understand why hearing testing matters)
• Operational disruption (if testing is during peak production, rates rise)
• Previous experience (workers who attended prior year testing are more likely to return)

Reducing No-Shows: Best Practices

• Notify workers 3-4 weeks in advance with specific appointment times
• Send reminder notices 1 week before
• Schedule testing during shift time, not on workers’ own time
• Make testing convenient (minimal disruption, nearby location)
• Emphasize the WHS importance and worker health relevance

Frequently Asked Questions

How many workers can be tested in a day with one testing booth?

A single audiometric booth can test approximately 20-30 workers per day. This assumes 12-15 minutes per worker (including registration, quiet period, testing, and result discussion), with an 8-10 hour testing day.

What is the time breakdown for each worker’s hearing test?

Registration: 2 minutes. Quiet period: 5 minutes. Pure-tone audiometric testing: 5-8 minutes. Result review and discussion: 2-3 minutes. Total per worker: approximately 12-15 minutes.

How does dual-booth testing increase daily capacity?

A mobile van with dual sound-attenuating booths can test 40-60+ workers per day. While one worker is being tested in one booth, the next worker can be completing their quiet period in the second booth, improving workflow efficiency.

How do I calculate how many testing days I need for my workforce?

Divide your total worker cohort by 25 (conservative estimate for single booth) or 50 (dual booth estimate). For example, 100 workers ÷ 25 = 4 days needed with single booth, or 100 ÷ 50 = 2 days with dual booths.

What percentage of workers typically don’t show up for scheduled testing?

No-show rates vary but typically range from 5-15% for on-site testing (with good communication) to 30-40% for clinic-based programs. Plan for potential rescheduling of 10-20% of your initial cohort.

Can testing accommodate workers across different shifts?

Yes, testing can be extended across day, afternoon, and night shifts. For example, day-shift workers test at shift end, afternoon-shift workers test before shift start, and night-shift workers test in early morning after shift. This reduces production impact.

How does noise in the testing environment affect throughput?

Excessive ambient noise can cause testing to be paused or rescheduled (if nearby machinery or loud events occur). Plan testing during quieter operational periods to minimize delays and ensure valid results.

What is the maximum practical throughput for audiometric testing per day?

The realistic maximum is 60 workers per day with optimal conditions (dual booth, back-to-back scheduling, minimal no-shows). However, 40-50 workers per day is a more sustainable target accounting for breaks, transitions, and operational realities.

Conclusion: Realistic Planning for Your Workforce

Understanding daily testing capacity is essential for realistic planning. A 100-worker program requires 4 days with single-booth testing or 2 days with dual booths — not a single day regardless of conditions.

Use the formula: total workers ÷ 25-50 per day = testing days required. Add buffer days for no-shows and rescheduling. Coordinate multi-day testing around shift patterns to minimise operational impact.

When you book with Anitech, we’ll help you calculate the precise number of testing days needed for your specific workforce and provide options for single or dual-booth testing based on your timeline and budget priorities.