A A Pract. 2020 Jul;14(9):e01280. doi: 10.1213/XAA.0000000000001280.
N95 respirator masks are used by medical providers for respiratory protection from airborne pathogens of transmissible diseases. In extreme situations or pandemics, when N95 masks may be in short supply, the American Society of Anesthesiologists (ASA) reported that some groups created their own N95 mask utilizing an anesthesia circuit mask plus a filter for use in short but high-risk procedures. The makeshift option for personal protective equipment was tested with a qualitative respirator mask fit test.