Which agents are used in qualitative fit-testing?

• A. Irritant smoke, banana oil, saccharin, and Bitrex
• B. Only Bitrex
• C. Only irritant smoke
• D. Only saccharin

Answer: (A)

Qualitative fit testing relies on the person detecting a test agent by taste or smell to determine whether the respirator seal is leak-free during simulated work movements. There are four commonly used agents for this purpose: Bitrex, which produces a bitter taste; saccharin, which has a sweet taste; banana oil, which has a banana-like odor; and irritant smoke, which creates a noticeable irritant sensation. If the wearer detects any of these agents during the test exercises, the fit is not adequate and adjustments are needed. Using multiple agents accommodates differences in individual sensitivity to taste, smell, or irritation, making the test more reliable than relying on a single agent. Therefore, the combination of irritant smoke, banana oil, saccharin, and Bitrex is used.