A novel approach to fit testing of the N95 respirator in real time in a clinical setting

A fitted N95 respirator has been recommended, legislated in the USA and other countries. The conventional Portacount fit test method can only be used in a laboratory environment. It cannot deliver real-time measurements of face-seal leakage when the N95 respirator is in use in clinical settings. This study aimed to develop a method to evaluate N95 respiratory protection in real time, in a clinical setting.