ERS technical standard: Global Lung Function Initiative reference values for exhaled nitric oxide fraction (<i>F</i>_ENO₅₀)

Abstract

Available <i>F</i> _ENO₅₀ data collected from different sites using different protocols and devices were too variable to develop a single all-age reference equation. Further standardisation of <i>F</i> _ENO devices and measurement are required before population reference values might be derived.