The goal of this clinical trial is to assess whether wheeze as assessed by a commercially available wheeze monitor is comparable to lung function as measured during a spirometry test. The main questions it aims to answer are whether measures of airflow obstruction (FEV1, FEV1/FVC, PEF) correlate with wheeze score (Tw/Ttot%).

Participants consenting to take part will undergo wheeze measurement prior to and during a spirometry test and will be asked to complete a series of symptom questionnaires.

Inclusion Criteria:

• Consenting adult (aged 18-95) University Hospitals Birmingham patient's attending the Lung Function and Sleep Department (LF&S) routinely as part of their standard clinical management pathway for Lung Function testing that includes Spirometry assessments.
• All patients irrespective of condition will be approached to participate.

Exclusion Criteria:

• Subjects who are contraindicated to perform spirometry on the day of testing
• Subjects who cannot speak or read English
• Patients accessing non-adult services
• Subjects who are unable or do not wish to consent
• Patients with known or suspected restrictive lung disease

IPD will not be available to other researchers