NELFCD and cystic fibrosis: Interesting data were obtained by studying the possibility of using indicators of FeNO and inflammatory markers (IM) in EBC (pH, nitrites, nitrates, hydrogen peroxide (H2O2), 8-isoprostane, and Th1/Th2 cytokines) to detect (exacerbate) CF and by studying the ability of these noninvasive IMs to indicate the CF severity [24].