How often does someone who wears a respirator have to be medically evaluated?

Individuals who wear a respirator must undergo a medical evaluation before being fit-tested and required to use the respirator. After the initial evaluation, the frequency of subsequent evaluations generally depends on the specific workplace and regulatory requirements, but they should occur at least annually or whenever there are changes in the individual's health status, job duties, or type of respirator used. Certain conditions or work environments may necessitate more frequent evaluations.