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Exhaled nitric oxide for the diagnosis of asthma in children and adults: a systematic review

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posted on 20.03.2020, 13:26 by Susan Harnan, Munira Essat, Tim Gomersall, Paul Tappenden, Ruth Wong, R. Lawson, Ian Pavord, M. Everard
The fraction of exhaled nitric oxide (FeNO) is a marker of eosinophilic inflammation, which is associated with some forms of asthma. Asthma is currently diagnosed using a pathway of tests including spirometery, airway reversability (response to bronchodilator or course of inhaled corticosteroids (ICS)) and airway hyper-responsiveness (e.g. methocholine challenge). FeNO may be a useful diagnostic test in this pathway. This systematic review aimed to identify and synthsise evidence rating to the diagnostic accuracy of FeNO for asthma with a UK focus. We looked at the highest sum of sensitivity and specificity, as well as evidence about the potential for FeNO to be used as a rule-in test (high-specificity) or as a rule-out test (high-sensitivity).

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