Occupational audiometric testing technology has evolved beyond the traditional button-press audiometer. Tablet-based interfaces, automated microprocessor audiometers, and app-based testing platforms have entered the market. For EHS professionals evaluating audiometric testing solutions, the question is not which interface looks modern — it is which platform meets OSHA 29 CFR 1910.95 audiometer standards and produces legally defensible records. According to CDC/NIOSH, approximately 22 million U.S. workers require occupational audiometric surveillance annually.
What OSHA and ANSI Actually Require
The regulatory and technical requirements for occupational audiometric testing are specific:
- Audiometer standard: ANSI S3.6 — the audiometer must meet pure-tone audiometer calibration and performance requirements
- Test environment: ANSI S3.1-1999 maximum permissible ambient noise levels (MPANLs) must be met in the test room
- Professional supervisor: A licensed audiologist or physician must review results and make STS determinations
- Record content: Results must include frequencies tested, thresholds by ear, and sufficient information to calculate STS against baseline
The response interface — dedicated button, tablet touchscreen, or other mechanism — is not separately specified in OSHA 1910.95 or ANSI S3.6. What matters is that the audiometer itself meets ANSI S3.6 calibration and performance standards, regardless of how the worker indicates they heard the tone.
Consumer-grade hearing screening apps on commercial tablets are not ANSI S3.6-compliant audiometers and should not be used for OSHA-required audiometric testing. The distinction: an app running on a commercial tablet with commercial headphones has not been validated to ANSI S3.6 transducer calibration standards. A purpose-built audiometric system using calibrated transducers and validated signal processing can meet ANSI S3.6 regardless of its physical form factor.
Type 4 Microprocessor Audiometers: The Occupational Standard
A Type 4 microprocessor audiometer automates the pure-tone presentation and threshold determination process. Unlike manual audiometry where a clinician controls tone presentation, the microprocessor audiometer presents tones automatically and records responses. This automation enables consistent test administration across many workers without per-test clinician involvement — while the Professional Supervisor reviews all results.
Soundtrace uses an automated Type 4 microprocessor audiometer meeting ANSI S3.6 standards. Workers interact with a simple response interface; the audiometer handles tone presentation, threshold tracking, and record generation automatically. Results are immediately transmitted to the cloud platform for Professional Supervisor review.
OSHA 1910.95(h)(5) requires audiometers to be calibrated at least annually and checked acoustically before each day of testing. The calibration records are part of the audiometric program documentation. An audiometer whose calibration is not current, or whose calibration records cannot be produced, creates validity questions about all audiometric results generated by that instrument during the uncalibrated period.
Frequently Asked Questions
ANSI S3.6-Compliant Automated Audiometry — At Scale
Soundtrace’s Type 4 microprocessor audiometer automates the testing workflow while meeting ANSI S3.6 and OSHA 1910.95 standards — with licensed audiologist Professional Supervisor review of every result.
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