What is an audiogram?

Audiometry determines the minimum intensity a person perceives at different frequencies under controlled conditions. An audiogram represents those thresholds for each ear. In occupational health it relates to prevention of noise-induced hearing loss, but an isolated audiometric pattern does not itself demonstrate occupational origin.

Conditions for a useful test

Equipment, test environment and staff competence influence reliability. Instructions and prior exposure circumstances also matter. Preparation follows the protocol and test objective, which may differ between initial examination, follow-up and confirmation. These objectives must not be mixed without documenting how each measurement was performed.

Compare with a baseline

A baseline measurement helps recognise later changes. Comparison must consider quality, conditions and programme criteria. A relevant change needs review and, where appropriate, confirmation or specialist assessment. Numerical definitions used by different organisations can differ and therefore do not automatically transfer as legal obligations to every country.

Look beyond noise

Clinical interpretation considers history and other factors affecting hearing. Ototoxic substances may also be present at work. Prevention and healthcare teams need to coordinate exposure information while maintaining confidentiality. Hearing protector use does not remove the need to investigate the noise source or chemical agents present.

Follow-up example

In a hypothetical situation, several people in one operation show changes needing confirmation. The programme reviews test quality alongside noise measurements, maintenance, tasks and protector fit. Collective information can guide preventive investigation without disclosing individual results or automatically concluding that every case has the same cause.

From examination to measures

Audiometry is health monitoring, not a noise-reduction measure. Results should lead to prevention and care decisions where appropriate. An apparently normal test does not permit increased exposure. Comparable records are retained and each person informed, with frequency and action defined by risk and the applicable framework.