Which type of fit test provides a numerical result?

The type of fit test that provides a numerical result is the quantitative fit test. This test measures the actual amount of leakage of particles or gas into the respirator mask to determine how well the mask fits the wearer’s face.

During a quantitative fit test, specialized equipment is used to gather data that quantifies the fit factor, which is expressed as a numerical value. This value indicates the ratio of the concentration of a contaminant in the ambient air compared to the concentration inside the respirator. A higher fit factor signifies a better fit, which is critical for ensuring the effectiveness of the respiratory protection.

In contrast, qualitative fit tests rely on the wearer's subjective response to a test agent (like a bitter or sweet solution) and do not provide a numerical measurement. While standard fit testing may indicate if a respirator fits satisfactorily, it typically does not yield quantifiable data. Similarly, challenge fit tests are often part of qualitative assessments and do not result in numerical outcomes.