Medical mask selection or the “4Fs”
The "4 Fs" of mask selection
1. Filtration: When smoke is present or when interacting with a tuberculosis-infected patient, use a high filtration mask (N95 respirator).
2. Fluid resistance:Choose a fluid-resistant mask when there is any chance of blood or other bodily fluid splatter. ASTM level 3 surgical masks are recommended.
3. Features: Always use a level 3 surgical mask with ties in surgical settings. Anti-fog film, foam and tapes reduce fogging issue distractions, and shields and protective eyewear keep eyes clear of blood and splash.
4. Fit: Even the correct mask could put clinicians at risk if it is not worn correctly. The nose and mouth must be completely covered and create a seal around the face to prevent gaps that increase the risk of inhalation exposure.
