In the context of COVID-19, well fitted respirators e.g. N95/P2-masks are recommended as part of personal protective equipment when performing aerosol generating procedures.

Fit-checking is recommended prior to donning a respirator. However, fit-checking is unreliable in detecting proper fit.

Fit-testing is recommended to ensure proper fit of respirators for individual health care worker and is required to comply with respirator standards. However, fit-testing is not performed in all health care settings.

The small cost of performing fit-testing has to be compared to the welfare of the health care workers as well as potential cost of sick leave or legal costs.

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