No clear asthma phenotype

Presence of other pulmonary diseases (Chronic obstructive pulmonary disease, alfa-1-antitrypsine deficiency emphysema, Immunoglobulin E deficiency, allergic bronchopulmonary aspergillosis)

\> 15 pack years

No sputum available

Respiratory infection

Other inflammatory diseases (Rheumatoid Arthritis, Colitis Ulcerosa)

Development and Validation of a Serum Biomarker for the Diagnostic Work-up of Asthma

What this study is about