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Audiometric testing is the core diagnostic tool of any industrial hearing conservation program — it measures worker hearing thresholds, detects early noise-induced hearing loss, and creates the documentation record that satisfies OSHA 1910.95 and defends against occupational hearing loss claims. This guide explains how it works, what it requires, and how industrial facilities manage it effectively.
Soundtrace provides in-house audiometric testing platforms for industrial facilities — eliminating mobile van scheduling, reducing per-test cost, and automating OSHA 1910.95 documentation.
OSHA estimates 22 million workers are exposed to potentially damaging noise annually. Audiometric testing is the only way to detect noise-induced hearing loss before it becomes severe — and the only way to document that workers were protected.
Industrial audiometric testing uses pure-tone air conduction audiometry to measure the softest sounds a worker can hear at specific frequencies. The standard occupational audiogram tests hearing at 500, 1000, 2000, 3000, 4000, and 6000 Hz — the frequency range most affected by noise exposure and most important for speech understanding. Results are recorded in decibels of hearing level (dB HL), referenced to the average thresholds of young adults with normal hearing.
The purpose in an occupational setting is not clinical diagnosis — it is surveillance. The test detects threshold changes over time that indicate noise is damaging a worker’s hearing before that damage becomes severe.
▶ Bottom line: An occupational audiogram is a surveillance tool, not a clinical one. Its value comes from serial comparison over time — a single test in isolation tells you where a worker is, not where they’re going.
OSHA 1910.95(g) establishes the audiometric testing requirements for general industry. Key obligations include:
| Requirement | OSHA Standard | Key Detail |
|---|---|---|
| Enroll exposed workers | 1910.95(c) | All workers at or above 85 dB(A) TWA action level |
| Baseline audiogram | 1910.95(g)(5) | Within 6 months; 14-hour quiet period required |
| Annual audiogram | 1910.95(g)(6) | Every 12 months; compared to baseline |
| Professional review | 1910.95(g)(3) | Audiologist or physician must review results |
| STS follow-up | 1910.95(g)(8) | Notification and refitting within 21 days |
| Records retention | 1910.95(m)(3) | Duration of employment |
▶ Bottom line: OSHA 1910.95(g) has seven distinct requirements for audiometric testing, each independently citable. A facility can be in full compliance with six and receive multiple Serious citations for failing the seventh.
A compliant industrial audiometric test follows this sequence:
Background noise in the test environment must not exceed ANSI S3.1 permissible ambient noise levels. Testing in an area that is too loud produces falsely normal results — workers with real hearing loss appear normal, and genuine loss goes undetected.
▶ Bottom line: The test environment is as important as the audiometer. A calibrated audiometer in a room that exceeds ANSI S3.1 ambient noise limits produces invalid results that create false confidence in worker hearing status.
Under 1910.95(g)(3), audiometric testing must be performed by:
The supervisory audiologist or physician does not need to be present during testing, but must be available for consultation and must review results. This makes remote audiologist oversight — via teleaudiology — a compliant model for in-house programs.
▶ Bottom line: The technician can conduct the test; the audiologist or physician must review the results and be available for consultation. Documenting that availability on each test day is essential for compliance.
| Factor | In-House Testing | Mobile/Third-Party Testing |
|---|---|---|
| Scheduling | Flexible; test on your timeline | Dependent on vendor availability |
| Per-test cost | Lower at scale; platform cost amortized | Higher per-test fee; annual contract costs |
| STS notification speed | Immediate if automated | Delayed; results returned by vendor |
| Records control | Direct; stored in your system | Held by vendor; access varies |
| Capital investment | Audiometer and software required | None |
| Training requirement | In-house technician must be CAOHC-certified | None for employer |
For facilities with 100+ enrolled employees, in-house testing typically delivers a lower total cost of compliance within 2–3 years. The primary driver is per-test cost reduction and elimination of mobile van scheduling delays that cause annual audiogram deadline misses.
▶ Bottom line: Mobile van testing is convenient but creates scheduling dependencies that are the single most common cause of audiometric testing deadline misses — which are per-employee OSHA citations.
Audiometers used for OSHA compliance must meet ANSI S3.6 specifications and be calibrated at three levels:
Test rooms or audiometric booths must meet ANSI S3.1 maximum permissible ambient noise levels. A sound level meter measurement of the test room should be documented as part of the program setup and repeated if the acoustic environment changes.
▶ Bottom line: Missing a daily biological calibration check — even if the audiometer is functioning correctly — is a standalone recordkeeping citation under 1910.95(h)(4).
Occupational audiograms produce thresholds in dB HL at each tested frequency. The reviewing audiologist or physician is looking for:
| Finding | Significance | Action Required |
|---|---|---|
| Thresholds 25 dB HL or better at all frequencies | Normal for occupational purposes | No action; retain record |
| High-frequency notch at 4000 Hz | Classic noise-induced pattern | Review noise exposure; reinforce HPD use |
| STS confirmed (10 dB avg shift at 2–4 kHz) | Regulatory trigger | 21-day notification, refitting, referral if persistent |
| Asymmetric loss (one ear significantly worse) | Possible non-occupational or unilateral noise exposure | Physician referral recommended |
▶ Bottom line: The 4000 Hz notch — a dip in hearing sensitivity specifically at 4000 Hz — is the audiometric signature of noise-induced hearing loss. Workers showing early notches should be prioritized for HPD compliance audits and noise exposure review.
OSHA 1910.95(m)(3) requires retention of audiometric test records for the duration of employment. Each record must include:
Calibration records must be retained for two years. OSHA 300 Log entries for confirmed, work-related hearing loss recordables must be retained for five years.
▶ Bottom line: Audiometric records are not just compliance documents — they are the employer’s primary defense against occupational hearing loss workers’ compensation claims filed years or decades after the exposure occurred.
Soundtrace makes in-house OSHA 1910.95-compliant audiometric testing accessible for industrial facilities of any size — with built-in documentation, STS alerts, and audiologist oversight.
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