The adequacy of user seal checking for N95 respirators compared to formal fit testing: A multicentred observational study.

Objective: The objective of this study was to evaluate the adequacy of the user seal check (USC) in predicting N95 respirator fit.

Design: This was a prospective, observational study conducted from May to September 2020.

Setting: The study setting included three private intensive care units (ICUs) in Victoria, Australia.