When performing a fit test, what must the wearer do if they detect the test substance?

When performing a fit test, it's essential for the wearer to indicate that they can detect the test substance. This is crucial because the detection of the test substance signifies that there may be a leak or an inadequate seal in the respirator. By reporting their detection, the wearer is contributing to ensuring that the protection offered by the respirator is effective.

Accurate reporting is vital for assessing the fit and overall safety, as an undetected leak could expose the wearer to harmful substances. This action helps facilitate the necessary adjustments or changes to ensure the respirator fits correctly, thereby enhancing safety during the use of the respirator in potentially hazardous environments.

In contrast, simply changing the respirator immediately without acknowledgment does not help assess the fit quality and may result in repeated errors. Waiting for the test to complete would overlook the immediate need to address any detected breaches in protection. Informing the supervisor is important, but the primary action required is to personally acknowledge the detection of the test substance to confirm the need for corrective measures.