The Journal of allergy and clinical immunology
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J. Allergy Clin. Immunol. · Oct 2000
Comparative StudyA comparison of exhaled nitric oxide and induced sputum as markers of airway inflammation.
Exhaled nitric oxide (ENO) has been proposed as a noninvasive marker of airway inflammation in asthma. ⋯ We conclude that ENO is likely to have limited utility as a surrogate clinical measurement for either the presence or severity of eosinophilic airway inflammation, except in steroid-naive subjects.