Table 1

Respiratory and non-respiratory conditions in which F_eno measurements may have a role in diagnosis

Increased F_eno	Variable changes in F_eno reported	Decreased F_eno
Asthma^1,⁷⁹ Late asthmatic response^80,⁸¹ Allergic rhinitis¹⁹ Viral infections^43,^44,⁸² Hepatopulmonary syndrome⁸³ Liver cirrhosis^84,⁸⁵ Acute/chronic rejection of lung transplant including bronchiolitis obliterans^86–⁹⁰	Bronchiectasis^91–⁹³ COPD^17,^75,^78,^94,^95,^96,^97,^98,^99,^100,^101,¹⁰² Fibrosing alveolitis¹⁰³ Sarcoidosis¹⁰⁴ Systemic sclerosis^105–¹⁰⁷	Cystic fibrosis^91,^108–¹¹⁰ Primary ciliary dyskinesia^111,¹¹² Pulmonary hypertension¹¹³ HIV infection¹¹⁴ ARDS¹¹⁵