Relationship Between Acoustic Breath Sounds and Spirometry

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