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The in-house vs. mobile van decision is one of the most consequential operational choices in hearing conservation program administration. Cost per test, employee downtime, scheduling flexibility, record custody, and program quality all differ significantly between the two models. This guide provides the data to make that decision correctly.
Soundtrace is an in-house audiometric testing platform that replaces annual mobile van visits with continuous, on-site testing — employees test in under 9 minutes, records are always audit-ready, and professional oversight is built into the system.
In-house testing costs $15–$30 per test at scale; mobile vans typically run $45–$80 per test. The per-test cost gap widens significantly at higher enrollment volumes. Downtime is also dramatically lower in-house: under 9 minutes versus 30–45 minutes per employee for a van visit.
| Cost Factor | Mobile Van | In-House (Soundtrace) |
|---|---|---|
| Per-test cost | $45–$80 | $15–$30 at scale |
| Mobilization fee | $500–$2,000 per visit | None |
| Average employee downtime | 30–45 min per employee | Under 9 min per employee |
| Professional oversight fee | Included (embedded in van price) | Included in Soundtrace platform |
| Record storage | Held by vendor; export fees common | Owned by employer; no export fee |
| Annual contract commitment | Typically required | Month-to-month available |
| Equipment purchase required? | No | Yes (audiometer + booth or quiet room) |
At 200 enrolled employees, the difference between a $60 mobile van rate and a $20 in-house rate is $8,000 per annual testing cycle — before accounting for the productivity cost of the time gap. At 500 employees, that gap reaches $20,000 per year. The crossover point where in-house becomes economically superior varies by facility size, but for most operations with more than 100 enrolled employees, in-house testing pays for the equipment investment within 2–3 years.
▶ Bottom line: The per-test cost gap between mobile vans and in-house testing is $25–$50 per employee. For facilities with more than 100 enrolled workers, the annual savings from in-house testing typically exceed the equipment cost within 2 years.
The invoice cost of a mobile van visit understates the true total cost because it omits productivity losses:
Both methods can produce OSHA-compliant results when executed correctly. The quality risks differ:
| Quality Factor | Mobile Van | In-House |
|---|---|---|
| Testing environment control | Van provides controlled environment; not dependent on facility | Requires quiet room meeting Appendix D; employer's responsibility |
| Audiometer calibration consistency | Van manages calibration; employer has no visibility | Employer controls calibration records; directly auditable |
| Professional oversight timeliness | Remote review often delayed 2–4 weeks | Can be immediate with integrated platform (Soundtrace) |
| STS notification timeline | Dependent on vendor turnaround; may compress the 21-day OSHA window | Immediate STS flag; employer controls the timeline |
| Test quality consistency | Variable — depends on van technician assigned | Consistent — same equipment, same protocol, same oversight |
Mobile van testing is inherently episodic — the van comes once a year, and the entire workforce must be cycled through on that day or within a narrow scheduling window. This creates operational disruption and makes it difficult to accommodate the 12-month individual testing cycle OSHA requires for each enrolled employee (as opposed to a once-per-calendar-year facility event).
In-house testing allows scheduling throughout the year. New hires can receive their baseline within 6 months of first exposure without waiting for the next van visit. Employees returning from extended leave can be tested on return. The 12-month individual cycle can be tracked and met for each person independently rather than managed as a group event.
▶ Bottom line: Mobile vans require you to test everyone on one or two days per year. In-house testing allows you to test any employee any day, meeting the per-employee 12-month cycle requirement without operational disruption.
When a mobile van vendor holds your audiometric records, your historical data is effectively their asset. Common issues that arise over time:
In-house testing with an employer-controlled platform means your records are immediately accessible, in a format you control, with no vendor intermediary between you and your compliance documentation.
| Facility Profile | Recommended Model |
|---|---|
| Under 50 enrolled employees, single site | Mobile van or clinic referral; in-house investment may not justify ROI |
| 50–150 enrolled employees, stable workforce | In-house begins to be cost-effective; evaluate based on turnover and scheduling complexity |
| 150+ enrolled employees, any site | In-house testing almost always economically superior; ROI typically within 18–24 months |
| Multiple sites, dispersed workforce | In-house at each major site; mobile van for small remote sites |
| High turnover (construction, staffing, manufacturing) | In-house essential — constant baseline intake requirement makes annual van visits impractical |
In-house audiometric testing typically runs $15–$30 per test at facilities with 100+ enrolled employees, factoring in equipment amortization, maintenance, and platform costs. The per-test cost decreases as employee volume increases. Initial equipment investment typically ranges from $5,000–$20,000 depending on booth requirements and audiometer type.
Mobile van testing typically costs $45–$80 per employee tested, plus a mobilization fee of $500–$2,000 per van visit. Total annual cost for a 200-employee testing day often runs $12,000–$18,000, depending on region, vendor, and add-ons. Some vendors bundle professional oversight and records management; others charge for each separately.
In-house testing must be conducted by a person meeting OSHA's qualification requirements: a CAOHC-certified Occupational Hearing Conservationist (OHC), audiologist, or physician. Testing must be conducted under the supervision of a licensed audiologist or physician who reviews results and makes STS determinations. Automated audiometric systems can conduct the test itself, but professional oversight of results is still required.
This is a significant and underappreciated risk. OSHA requires audiometric records to be retained for the duration of employment. If a vendor ceases operations, records may be inaccessible, transferred to an acquiring company without notice, or require legal action to recover. Employers are still responsible for retention regardless of vendor status. In-house platforms under employer control eliminate this dependency entirely.
Yes, if conducted in an appropriate environment. OSHA Appendix D specifies maximum permissible ambient noise levels at each test frequency — for example, no more than 40 dB SPL at 500 Hz. Many quiet rooms in industrial facilities meet these requirements with a standard audiometric booth insert. The environment must be measured to confirm compliance — assumption is not adequate.
Key contract terms to review: record ownership and export rights (you should own your records and be able to export them without fee); record format (ensure portability to other systems); professional oversight arrangement (who reviews results, who makes STS determinations, and their qualifications); STS notification timeline (ensure it supports OSHA's 21-day requirement); and what happens to your records if the vendor is acquired or closes. Verify the data export before terminating the prior vendor relationship. Records must be retained for the duration of employment regardless of vendor changes.
Soundtrace delivers in-house audiometric testing at $15–$30 per test, with under-9-minute employee turnaround, automatic STS flagging, and professional oversight built in.
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