You should never reuse PFT filters, even if they appear visually clean after a session. These components are strictly single-use devices designed to trap microscopic pathogens like Mycobacterium tuberculosis that aren’t visible to the naked eye. Reusing a filter increases the risk of cross-contamination between patients by 100%. At Collins Medical, we recommend disposing of the filter immediately after the patient leaves the testing area to maintain the highest hygiene standards.