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Exhaled nitric oxide is a marker of lower airway inflammation, and fractional exhaled nitric oxide (FENO) has been proposed as a diagnostic test for asthma. Researchers compared the diagnostic yield of FENO, percentage eosinophils in induced sputum (eos%), and forced expiratory volume in 1 second (FEV1) in 150 consecutive white children (age range, 6–18 years) with cough, dyspnea, and wheezing who were referred to an Israeli pediatric pulmonology clinic. Asthma diagnoses were determined 18 months later by a pediatric pulmonologist who was blinded to test results, based on a history of at least two of the following clinical criteria: multiple wheezing episodes, cough or dyspnea relieved by bronchodilators, reversibility of abnormal FEV1 with…