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OSHA’s hearing conservation standard at 29 CFR 1910.95(g)(3) creates three distinct pathways for who may administer audiometric tests in an occupational hearing conservation program. One of those pathways — the “demonstrated competence” standard — specifically accommodates operators of microprocessor audiometers without requiring CAOHC certification. Understanding this distinction matters enormously for employers evaluating audiometric testing vendors and program models: CAOHC certification is required for manual audiometry technicians, but it is not required for operators of microprocessor audiometers who meet OSHA’s demonstrated competence standard.
Soundtrace operates as a professional supervisor under the demonstrated competence pathway — using a cloud-connected Type 4 microprocessor audiometer operated by client staff who complete Soundtrace’s documented training program, with all audiogram review conducted by licensed audiologists.
1910.95(g)(3): “Audiometric tests shall be performed by a licensed or certified audiologist, otolaryngologist, or other physician, or by a technician who is certified by the Council for Accreditation in Occupational Hearing Conservation, or who has demonstrated competence in administering audiometric examinations, obtaining valid audiograms, and properly using, maintaining and checking calibration and proper functioning of the audiometers being used.”
OSHA 1910.95(g)(3) identifies three categories of persons who may administer audiometric tests in an occupational hearing conservation program:
The third pathway exists because OSHA recognized that microprocessor audiometers fundamentally change the operator’s role. A manual audiometry technician must make real-time clinical judgments about tone presentation timing, patient response validity, and threshold determination. A microprocessor audiometer automates these functions. The operator’s role shifts to patient preparation, instruction, environment setup, and quality assurance — tasks that can be learned through a structured training program without a 20-hour CAOHC course.
| Function | Manual Audiometry | Microprocessor Audiometry |
|---|---|---|
| Tone delivery | Operator manually presents tones at selected frequencies and levels | Automated — device controls all tone presentation |
| Response detection | Operator observes and interprets patient response signals | Automated — device detects and records responses |
| Threshold determination | Operator applies modified Hughson-Westlake procedure manually | Automated — device applies algorithm and determines threshold |
| Audiogram recording | Operator manually records thresholds on audiogram form | Automated — device generates and stores digital audiogram |
| Operator skill required | High — tone presentation technique directly affects validity | Lower — operator role is preparation, instruction, and QA |
| Operator certification | CAOHC certification is the standard | Demonstrated competence satisfies 1910.95(g)(3) |
| PS review still required? | Yes | Yes |
The critical point is that the automation of the audiometric procedure does not reduce the clinical requirements for the audiogram — it changes who needs to perform what. The microprocessor handles the technical audiometric functions that require clinical training in manual audiometry. The operator handles logistics. The professional supervisor handles clinical judgment about the results.
OSHA has not published a precise definition of demonstrated competence in the regulatory text, but has clarified its meaning through letters of interpretation and enforcement guidance. Demonstrated competence encompasses the following capabilities:
The operator must know how to correctly set up and operate the specific microprocessor audiometer being used — including initiating tests, entering employee information, managing calibration checks, and retrieving completed audiograms. This is device-specific training, not general audiometry training.
The operator must understand and be able to implement requirements for the test environment — including ambient noise levels under OSHA Appendix D and ANSI S3.1 standards, the waiting period before testing for employees with recent noise exposure (14 hours quiet time under 1910.95(g)(5)(iii)), and identification of conditions that would invalidate the test.
The operator must be able to correctly instruct the employee being tested on what the test involves, what response is expected (pressing the response button when a tone is heard), and why accurate responses are important. Inadequate instruction is a common cause of invalid audiograms.
The operator must understand the difference between daily acoustic checks, annual calibration, and exhaustive calibration requirements under OSHA Appendix E, and must be able to perform or coordinate each. For microprocessor audiometers, daily functional checks are typically automated or semi-automated by the device.
The operator must be able to recognize when a test result appears invalid — including excessive response variability, results that are implausibly better than the employee’s history, or test interruption due to noise — and know when to flag the result for professional supervisor review rather than accepting it as valid.
In an OSHA inspection, demonstrated competence is only as strong as the documentation supporting it. A written training curriculum, a record of which employees received training, a description of what the training covered, and attestation by a qualified person that competence was verified — these are what an inspector evaluates. Operators who “seem to know what they’re doing” without documented training do not satisfy the standard.
CAOHC certification is not required for microprocessor audiometer operators under federal OSHA jurisdiction. This is clear from the regulatory text of 1910.95(g)(3), which lists demonstrated competence as an alternative to CAOHC certification, and from OSHA letters of interpretation confirming that the demonstrated competence pathway applies to microprocessor audiometer use.
However, CAOHC certification may be required in the following circumstances:
Oregon OSHA (OAR 437) and Washington WISHA (WAC 296-817) both require CAOHC certification for audiometric technicians, regardless of audiometer type. These state-specific requirements apply to private employers in those states. Federal workplaces in Oregon and Washington are subject to federal OSHA only and are exempt from state plan requirements.
The demonstrated competence pathway changes who can administer the test. It does not change the requirement for professional supervisor review. Under 1910.95(g)(1), a professional supervisor — a licensed audiologist, otolaryngologist, or physician — must be responsible for the program and must review audiograms for clinical significance.
Specifically, the professional supervisor must:
In a vendor-managed microprocessor audiometry program, the professional supervisor is typically employed by the audiometric testing vendor and reviews audiograms remotely via a cloud platform. The demonstrated-competence operator at the employer’s facility administers tests; the vendor’s audiology team performs all clinical review functions.
Federal OSHA covers most private sector employers. State plan states operate their own OSHA programs and may impose requirements that are at least as protective as federal standards, but may also be more stringent. For audiometric technician qualifications, the most significant state-specific requirements are:
| State | Jurisdiction | Technician Requirement |
|---|---|---|
| Oregon | Oregon OSHA (state plan) | CAOHC certification required regardless of audiometer type |
| Washington | WISHA/L&I (state plan) | CAOHC certification required regardless of audiometer type |
| Texas | TDH audiometric technician registration | Separate state registration required for audiometric technicians at private employers |
| Michigan | MIOSHA (state plan) | No certification requirement beyond federal standard |
| Ohio | Federal OSHA (no state plan for private) | Federal demonstrated competence standard applies |
| California | Cal/OSHA (state plan) | Follows federal 1910.95 structure; no added certification requirement |
Federal workplaces — those operated by federal agencies or federal contractors on federal property — are subject to federal OSHA regardless of state location and are exempt from state plan requirements.
An employer or vendor relying on the demonstrated competence pathway should maintain the following documentation to withstand OSHA inspection scrutiny:
Soundtrace trains your staff to operate our cloud-connected microprocessor audiometer under the demonstrated competence standard — with licensed audiologist PS review of every audiogram, built into the platform.
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