Evaluate Occupational Hearing Loss (29 CFR 1904.10)
osha_evaluate_hearing_lossEvaluate audiogram data against OSHA 1904.10 to determine recordable hearing loss, comparing current and baseline thresholds at 2k, 3k, 4k Hz, and applying STS, 25 dB, retest, age-adjustment, and PLHCP rules.
Instructions
Compute whether an audiogram produces a recordable hearing loss. Two tests must BOTH be met and, critically, in the SAME ear: a Standard Threshold Shift of 10 dB or more averaged at 2000, 3000 and 4000 Hz against the employee's baseline (1904.10(b)(1)), and a total hearing level of 25 dB or more above audiometric zero on the current audiogram (1904.10(a)). An STS in one ear and a 25 dB level in the other does not record. Pass raw audiogram values and the tool does the arithmetic — do not compute averages yourself. If the employee has had a prior recordable hearing loss, pass the REVISED baseline (b)(2)(i)). Age adjustment from Tables F-1/F-2 of 1910.95 appendix F applies to the STS test only, never to the 25 dB test (b)(3)). A retest within 30 days that does not confirm the STS defeats the case; one that confirms it starts a 7-day recording clock (b)(4)). A PLHCP determination of no work-relatedness ends it entirely (b)(6)). Reference and triage only — not legal advice.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| retest_date | No | ISO 8601 date of a confirming retest. Used to compute the 7-calendar-day recording deadline (1904.10(b)(4)). | |
| current_left | Yes | LEFT ear current audiogram. | |
| baseline_left | Yes | LEFT ear baseline audiogram. If the employee has previously had a recordable hearing loss, use the REVISED baseline reflecting that case, not the original (1904.10(b)(2)(i)). | |
| current_right | Yes | RIGHT ear current audiogram. | |
| baseline_right | Yes | RIGHT ear baseline audiogram, or the revised baseline if a prior hearing loss was recorded. | |
| retest_confirmed_sts | No | If retested, did the retest CONFIRM the recordable STS? A retest within 30 days that does not confirm it means the case need not be recorded. | |
| age_adjustment_db_left | No | Optional dB age correction for the LEFT ear, derived from Tables F-1/F-2 of 29 CFR 1910.95 appendix F. Applies ONLY to the STS test — it may NOT be applied to the 25 dB total-hearing-level test (1904.10(b)(3)). The tool does not compute this; supply it from the tables or leave 0. | |
| age_adjustment_db_right | No | Optional dB age correction for the RIGHT ear. Same rules as the left. | |
| retested_within_30_days | No | Was the employee's hearing retested within 30 days of the first test? (1904.10(b)(4)) | |
| plhcp_determined_not_work_related | No | Has a PLHCP determined, applying 1904.5, that the hearing loss is not work-related or that occupational noise did not significantly aggravate it? If so the case need not be recorded (1904.10(b)(6)). |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| kind | Yes | ||
| value | Yes | ||
| cfr_cite | Yes | ||
| source_url | Yes | ||
| last_verified | Yes |