Which type of Fit Testing relies solely on the test subject's perception?

Qualitative Fit Testing is based on the test subject's perception of whether a particular test agent is detected while wearing a respirator. This method typically uses substances that have a known odor, taste, or irritant effect when exposed. The subject's response to these stimuli—whether they can sense the test agent—determines the effectiveness of the respirator's seal.

This approach highlights the subjective experience of the individual, as it relies heavily on their ability to notice the presence of the test agent. The test's outcome depends on the individual's sensory perceptions, making it distinct from other methods that utilize quantitative measurements or instruments to determine fit. In contrast, other options involve objective measurements or established standards, making qualitative fit testing uniquely reliant on personal perception and response.