Previous confirmed diagnosis of asthma or other chronic airways disease

Respiratory tract infection within six weeks prior to testing

Current smoker or ex-smoker with a greater than 10p\\pack-year smoking history

Inability to perform pulmonary function testing to acceptable technical standards

Contraindications to any of the diagnostic investigations as per departmental guidelines

Lack of capacity to provide informed consent

First-Line Diagnostic Investigations for Suspected Adult Asthma