The pre-employment baseline audiogram is the single most consequential document in occupational hearing loss workers’ compensation claims. It establishes the worker’s hearing status before noise exposure at your facility began — and without it, every threshold shift the worker presents at claim time becomes your liability, regardless of how many prior employers contributed. According to CDC/NIOSH, approximately 22 million U.S. workers face hazardous noise exposure annually. A significant proportion carry pre-existing hearing loss from prior employment or recreational noise that a baseline audiogram would document — and that documentation would limit the current employer’s liability period.
What a Baseline Audiogram Does Legally
In workers’ compensation proceedings, the question is causation: did this employer’s operations cause or contribute to this worker’s hearing loss? A pre-employment baseline audiogram answers that question by establishing a before-picture. If the baseline shows a pre-existing 4 kHz notch at 30 dB HL, the employer’s liability is limited to any additional shift that occurred during employment — not the pre-existing loss that predated it.
Without a baseline, the employer has no before-picture. When the worker presents at retirement with 50 dB HL at 4 kHz, the entire loss is potentially attributable to the current employer unless the employer can produce records from prior employers (which it typically cannot) or expert testimony about pre-existing conditions (which is expensive and uncertain).
OSHA 29 CFR 1910.95 permits baseline audiograms to be completed within 6 months of first noise-exposed placement (or 12 months if a mobile test van is used, with HPD required during the interim). For OSHA compliance, this window is acceptable. For WC defense, every day of noise exposure before the baseline is a period during which the employer’s contribution to any threshold shift cannot be cleanly separated from what existed at hire. Best practice: baseline before or on the first day in a noise-exposed role.
ADA Considerations: What You Can and Cannot Do
Pre-employment audiograms sit at the intersection of OSHA requirements and ADA constraints. The rules:
- Timing: Audiometric testing may only be conducted after a conditional offer of employment, not before. Conducting audiograms pre-offer as a screening tool violates the ADA.
- Use of results: Baseline audiogram results cannot be used to rescind a conditional offer unless hearing ability is a bona fide occupational qualification (BFOQ) for the specific role and reasonable accommodation is not possible. Most industrial roles do not qualify for BFOQ exception.
- Confidentiality: Audiometric test results are medical records protected under HIPAA and ADA. Results must be stored separately from personnel files and shared only with the professional supervisor and the employee.
- Documentation purpose: The baseline’s legal value in WC defense is that it documents pre-existing status, not that it identifies who to exclude from employment.
Communicate the pre-employment audiogram as: “We conduct a hearing check before you start in noise-exposed areas so we have a baseline record of your hearing status. You receive your results. This protects both you and the company if any hearing changes occur during employment.” This framing is accurate, legally appropriate, and increases employee acceptance of the process.
What the Baseline Record Must Include
To be legally defensible, the pre-employment baseline audiogram must meet OSHA’s technical requirements under 29 CFR 1910.95(h):
- Pure-tone, air conduction audiogram at 500, 1000, 2000, 3000, 4000, and 6000 Hz in each ear
- Audiometer meeting ANSI S3.6 calibration standards
- Test environment meeting ANSI S3.1-1999 maximum permissible ambient noise levels
- Name of the person who conducted the test
- Review by a licensed or certified audiologist or physician serving as Professional Supervisor
- 14-hour quiet period prior to testing (or if not achievable, hearing protection worn during the quiet period)
Frequently Asked Questions
Baseline Before Day One — The Standard That Protects You
Soundtrace delivers automated pre-employment audiometric testing that meets OSHA 1910.95 and ANSI S3.6 standards — with licensed audiologist Professional Supervisor review and same-day results.
Get a Free Quote