Factors that increase FENO | Factors that decrease FENO |
Age over 12 years | Alcohol, caffeine ingestion |
Asthma | Bronchiectasis |
Atopy | Cigarette smoking, environmental tobacco smoke |
Drugs | Chemical exposure |
Enalapril | Water vapor |
Exacerbation of COPD | Nitrous oxide |
Air pollution exposure | Heptane |
Ingestion of arginine or nitrite/nitrate rich foods | 100 percent oxygen |
Chemical exposure | Drugs |
Chlorine dioxide | Antileukotriene agents |
Fluoride | Glucocorticoids |
Formaldehyde | Oxymetazoline |
Latex | NOS inhibitors |
Ozone | Exercise |
Nonasthmatic eosinophilic bronchitis | Hypothermia |
Upper respiratory tract infections | Menses |
Moderate altitude | |
Repeated spirometry | |
Sputum induction |
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