OSHA Baseline vs Annual Audiogram: Employer Guide

A manufacturer begins monitoring noise exposure and identifies employees at the hearing-conservation action level. The safety manager books a mobile test van for the next visit and puts annual testing on the calendar. That may sound orderly, yet the baseline timing, the rules for testing conditions, the first annual comparison and the handling of a possible hearing change are different steps. A single “hearing test complete” field can hide an overdue baseline or an annual result that has not been compared with it.

For covered United States general-industry work, 29 CFR 1910.95 sets the hearing-conservation and audiometric-testing requirements. A baseline audiogram is the valid reference established after a worker first meets the action level. Later annual audiograms are compared with that baseline. The standard then sets rules for evaluating a possible standard threshold shift and for follow-up. The employer must organise those steps, but it must not substitute an administrative dashboard for the qualified people the rule identifies to perform tests and review problem audiograms.

This guide is about the employer's workflow: identifying covered employees, making testing available, meeting timing rules, keeping the correct records and acting on a qualified result. It does not interpret an individual audiogram, diagnose hearing loss, decide whether a shift is work related or say when a clinician should revise a person's baseline. Those are separate professional decisions. The guide also does not convert the federal general-industry standard into a universal rule for every US workplace, state plan or industry.

First establish who enters the programme

Paragraph c requires a continuing, effective hearing-conservation programme when employee noise exposure equals or exceeds an eight-hour time-weighted average of 85 decibels on the A scale, or a fifty-percent dose. The standard calls this the action level. The exposure calculation for the programme is made without credit for attenuation from hearing protection. A worker wearing earplugs should not simply be removed from the programme because a manager assumes the plugs reduce the measured exposure below the trigger.

Paragraph d addresses monitoring when information indicates that exposure may meet the action level. The measurement strategy must identify employees for inclusion in the programme and enable proper hearing-protector selection. It has conditions for representative personal sampling when area monitoring is generally inappropriate. If production, process, equipment or controls change in a way that increases exposures sufficiently, monitoring must be repeated under the paragraph's stated triggers. Do not place a worker on or off the audiometric schedule solely because their job title appears on a generic list. Use the exposure assessment and the actual rule.

Paragraph g1 requires the employer to establish and maintain an audiometric-testing programme by making testing available to employees whose exposures equal or exceed the eight-hour time-weighted average of 85 decibels. Paragraph g2 says the programme is provided at no cost to employees. The testing obligation is therefore linked to the measured exposure condition, not an employer's desire to use an annual medical questionnaire for everyone.

An employer should identify when each employee first met the action level and keep the underlying exposure information traceable. That start date affects the baseline deadline. Changes of shift, workstation or equipment may alter exposure and who belongs in the programme. If monitoring data is missing or outdated, resolve that question through the noise programme rather than guessing the audiometric due date from a hiring date. The date an employee joined the company is not necessarily the date of first exposure at or above the action level.

The baseline is a valid reference, not just the first test on file

Paragraph g5i says the employer must establish a valid baseline audiogram within six months of an employee's first exposure at or above the action level. Later audiograms are compared against that reference. A test from another setting may be useful context, but the employer should not automatically label a historic, incomplete or unsuitable result as the valid OSHA baseline. The testing provider should confirm that the audiogram meets the applicable requirements and can serve as the reference.

There is a specific mobile test van exception in paragraph g5ii. Where mobile test vans are used to meet the obligation, the employer must obtain a valid baseline within one year of first exposure at or above the action level. When it is obtained more than six months after first exposure, employees must wear hearing protectors for the period after six months until the baseline is obtained. Do not turn the one-year van provision into a universal one-year baseline deadline. It is conditional, and the interim protection requirement matters.

The baseline test also has conditions that differ from routine annual scheduling. Paragraph g5iii calls for at least 14 hours without exposure to workplace noise before testing. Hearing protectors may substitute for that workplace-noise-free period. Under paragraph g5iv, the employer must tell employees to avoid high levels of nonoccupational noise during the 14 hours immediately before the examination. A booking reminder should make those instructions clear. If a worker arrives after a noisy activity that could affect validity, the testing provider should decide how to handle the test under the applicable procedures. An administrator should not quietly mark it as a valid baseline merely to close a deadline.

Baseline planning is therefore more than scheduling a date. Identify the first qualifying exposure, determine whether the ordinary six-month or the conditional mobile-van timing applies, provide any required interim hearing protection, communicate the pre-test instructions and receive a valid result from the qualified testing arrangement. The person managing the calendar can coordinate these steps without interpreting the hearing thresholds.

Annual testing has a different purpose

Once the valid baseline exists, paragraph g6 requires a new audiogram at least annually for each employee exposed at or above the eight-hour time-weighted average of 85 decibels. That annual test is a current measurement to be compared with the baseline. It does not create a new baseline every year by default. If a record system overwrites the original reference with the most recent test, it can break the comparison the rule requires.

Paragraph g7i says each annual audiogram is compared with the employee's baseline to determine validity and whether a standard threshold shift has occurred. The comparison may be made by a technician. The person or service conducting the work must meet the standard's testing and supervision provisions. A safety manager should ensure the provider receives the correct baseline and relevant prior information, and should receive a clear result and action instruction. The manager should not infer a medical conclusion from an unexplained graph.

The annual appointment can also reveal a problem with programme data. Perhaps the employee's noise exposure changed, the baseline is missing, or the annual result has not been linked to the right person. These are process failures worth correcting before a deadline or follow-up is missed. A roster showing “tested” is not enough to show that the comparison and any required response occurred. Track the outcome of the provider's evaluation, while handling confidential health information appropriately and according to the applicable record-access rules.

Do not present the annual audiogram as a general substitute for noise exposure monitoring or hearing-protector assessment. Those are other parts of section 1910.95. A hearing test can identify a possible change; it does not measure the noise level at a workstation. If the workplace or production process changes, revisit monitoring under paragraph d's triggers rather than assuming the next annual audiogram will answer the exposure question.

The main differences at a glance

| Employer question | Baseline audiogram | Annual audiogram | | --- | --- | --- | | Why is it obtained? | Establish a valid reference for future comparison. | Obtain a current result to compare with the valid baseline. | | What starts the timing? | First employee exposure at or above the action level. | The established baseline and continuing qualifying exposure. | | What federal interval applies? | Ordinarily within six months, with a conditional mobile-van extension to one year and interim protection. | At least annually after the baseline for employees at or above the stated exposure level. | | What special preparation is stated? | At least 14 hours without workplace noise, with the stated hearing-protector substitute, plus notice about high nonoccupational noise. | Follow the testing programme requirements and provider instructions; do not assume the baseline preparation rule is itself a new annual baseline. | | What happens after the result? | Retain a valid reference for later comparison. | Compare with the baseline, assess validity and potential threshold shift, and apply any triggered follow-up. |

The table summarises the federal OSHA provision. A testing provider may give additional instructions for reliable testing. Other applicable rules or agreements may require more. Keep the source of each requirement clear, especially when an internal procedure is more detailed than the regulation.

What a possible standard threshold shift changes

The standard defines a standard threshold shift in paragraph g10 as a specified average change at 2000, 3000 and 4000 hertz in either ear relative to the baseline. This article will not calculate or interpret a worker's result. The employer should obtain the provider's valid comparison and follow the standard's review process. Age correction may be used under the rule's specified method; it is not a reason for an administrator to edit a result without qualified review.

If an annual audiogram indicates a standard threshold shift, paragraph g7ii permits the employer to obtain a retest within 30 days and treat the retest as the annual audiogram. That is an option in the stated circumstances, not an automatic 30-day delay for every response. The problem-audiogram provision assigns review to an audiologist, otolaryngologist or physician and requires the employer to provide specified information for that review. The employer should arrange the qualified review promptly and avoid presenting a software-generated flag as the professional conclusion.

Where the comparison indicates a standard threshold shift under the definition, paragraph g8i requires written notice to the employee within 21 days of the determination. Paragraph g8ii sets follow-up steps unless a physician determines that the shift is not work related or aggravated by occupational noise exposure. Those steps can include hearing-protector fitting, retraining, different protection and clinical referral depending on the situation. The employer needs to know the qualified determination and applicable next step, not simply mark the annual test “complete.”

Do not collapse a possible shift, a confirmed shift, a medical diagnosis and an OSHA recordable case into one status. They involve different criteria and decisions. The testing and occupational-health professionals should handle the audiometric interpretation and medical questions. The employer should manage deadlines, employee notice, protective measures and records on the basis of the appropriate result. This article is not a guide to diagnosing hearing loss or deciding recordability for a particular person.

A revised baseline requires a qualified judgment

Paragraph g9 permits an annual audiogram to be substituted for the baseline in stated circumstances when the audiologist, otolaryngologist or physician evaluating the audiogram makes the relevant judgment. The two circumstances concern a persistent standard threshold shift or significant improvement in the hearing threshold compared with the baseline. The rule does not authorise an administrator to replace the baseline merely because a newer file arrived.

A good records process therefore retains the baseline, the annual series and the qualified decision that a new baseline has been adopted. It should identify from when the new reference applies. Do not overwrite the former baseline without preserving the history needed to understand earlier comparisons and follow-up. Ask the provider what record should be treated as the operative baseline. If the provider has not made a clear decision, hold that administrative update rather than silently choosing the newest audiogram.

This is an example of a topic that can be covered responsibly without the article itself giving medical advice. The article states who makes the judgment and what the employer must coordinate. It does not tell a reader whether a specific worker's result is persistent or medically significant. That distinction is essential to accurate content and to the safety of the employer's process.

Recordkeeping and privacy in the testing sequence

Paragraph m2 requires the employer to retain audiometric test records obtained under paragraph g. It lists information including the employee's name and job classification, audiogram date, examiner, last acoustic or exhaustive audiometer calibration date and the employee's most recent noise exposure assessment. The paragraph also addresses accurate records of background sound levels in test rooms. Under paragraph m3, audiometric test records are retained for the duration of the affected employee's employment. Noise exposure measurement records under the same paragraph have a different minimum retention period.

The employer needs a way to connect each annual result to the correct valid baseline while preserving the required data. A general training spreadsheet with only “hearing test passed” and an expiry date is insufficient to manage the comparison and follow-up. Equally, access to medical details should not be opened to every supervisor merely because the record sits in an operational compliance system. The standard has record-access provisions. Apply relevant privacy and employment controls to the actual records and recipients. This guide does not declare a particular software permission model legally sufficient.

Ask the testing provider how results and clinical recommendations will reach the employer and the employee. Decide who receives a possible shift notification and who tracks the 21-day employee notice after a determination. Identify how a retest, if chosen, is linked to the original annual result. Make sure the responsible team can tell whether a finding is pending qualified review, confirmed, superseded by a retest or closed after the required follow-up. The labels should describe real decisions, not invent medical certainty.

If employees move between sites or leave employment, preserve the records for the period the standard states and follow its access rules. Avoid using a change of manager or testing contractor as an excuse for losing the baseline. The operational handoff should maintain the identity and history needed for future comparisons. Those are practical controls that support the actual regulatory duty.

A practical employer workflow from exposure to follow-up

Start with the noise exposure assessment. Identify employees at or above the action level, and record when each first met it. Establish a hearing-conservation programme and make audiometric testing available at no cost. Select a testing arrangement meeting the qualifications and technical provisions in paragraph g and paragraph h. Set each baseline deadline based on the ordinary six-month rule or the conditional mobile-van provision. Give workers the required pre-baseline instructions and arrange interim hearing protection when the van exception makes it necessary.

When the baseline is obtained, confirm the provider has established a valid reference. Preserve it with the employee's identity, exposure information and required record fields. For employees who continue to meet the stated exposure condition, schedule annual audiograms and make sure each is compared with the operative baseline. Treat a possible standard threshold shift as an action item for qualified evaluation, possible retest and the required employee notice and protection steps. Record what was determined and when the follow-up occurred.

Update the roster when employees enter or leave qualifying noise work. If production or equipment changes could increase exposure, check the monitoring triggers rather than waiting for a hearing test to reveal the change. Review the programme's annual training and hearing-protector duties separately. An audiogram is one component of a continuing hearing-conservation programme; a complete set of appointment dates alone is not the whole programme.

At each handoff, ask whether the current record says what actually happened. “Baseline booked” is not “valid baseline established.” “Annual test performed” is not “annual result compared.” “Shift flagged” is not “employee informed in writing within the stated time after determination.” Separating these stages helps the employer see an unfinished duty before the administrative task is closed.

Common errors that make a neat calendar misleading

One error is counting six months from hire rather than first qualifying exposure. Another is applying the mobile-van one-year period to everyone and forgetting interim hearing protection where the baseline is obtained after six months. A third is placing a result in the “baseline” slot merely because it is the earliest file available, without confirming validity. A fourth is resetting the baseline automatically every year, leaving no stable reference for comparison.

An employer can also make the opposite mistake: obtaining annual tests but never comparing them with the baseline. That leaves the stated purpose of the annual audiogram unfinished. A possible shift can then sit in a provider portal until the employee-notice or protection step is late. Treat the provider's result and qualified review as part of the process, not an optional attachment to a calendar task.

Avoid treating all hearing changes as work-related or all flagged results as invalid. The standard provides for review, possible retest and a physician's determination on work relationship for specified follow-up. Those are not decisions to make from a marketing article or an automated score. The employer should provide the needed information and carry out the actions the actual determination supports.

Finally, do not conflate hearing-conservation audiometric testing with the separate OSHA injury and illness recordkeeping criteria. A question about recording a hearing-loss case requires the applicable recordkeeping standard and the facts of that case. This article's owner is the baseline-to-annual employer workflow, not a medical or OSHA Log determination.

What a tool should and should not claim to do

A well-run workflow may need to identify covered employees, preserve exposure dates, prompt baseline and annual appointments, retain provider records and show that a follow-up remains open. These are possible requirements to ask a vendor about. They are not evidence that Complys currently performs any of those functions. No Complys audiogram interpretation, medical-record management, automatic shift determination or legal compliance feature has been claimed, and none is claimed here.

Any tool used for the process should preserve the qualified provider's role. A reminder cannot establish a valid baseline. A red flag cannot decide whether a shift is persistent, work related or medically significant. A completed checkbox cannot show that the employee received a written notice unless the underlying communication actually occurred. A manager should confirm what the implemented product can do and what remains a human and provider responsibility.

For the broader US safety-programme context, read the Complys US written safety programme guide and the US Complys site. If you are evaluating record or reminder software, ask to see the current workflow with a baseline, an annual comparison and a result requiring qualified follow-up. Choose the process on its demonstrated capability, not a promise of automatic OSHA compliance.

Related guides

See also: OSHA Emergency Eyewash: When Corrosive Exposure Triggers It, When OSHA Noise Monitoring Must Start or Be Repeated.