A Cross Sectional, Diagnostic Accuracy Study to Validate the Use of a New Device(Inflammacheck™) in Diagnosing COPD

Inclusion Criteria: * Male or Female, aged ≥40 years. * A confirmed, clinician made diagnosis of COPD supported by spirometric evidence of fixed airflow limitation (post-bronchodilator ratio of FEV1/FVC \<0.7) recorded at any time. * OR no known history of lung disease (defined as no current clinical diagnosis of, or be receiving treatment for, a lung disease) and be a current non-smoker. Ex-smokers with a less than 5 pack year history of smoking (cigarettes and cannabis) and who have stopped smoking ≥6 months ago can be included. * Willing and able to give informed consent for participation in the study. Exclusion Criteria: * Existing co-morbidities that may prevent them from performing spirometry (at the discretion of the clinical investigator). * Known other lung, chest wall, neuromuscular, or cardiac disease (including end-stage disease or cancer) that would confound Inflammacheck™ measurements and spirometry (at the discretion of the clinical investigator). * Has received treatment for an exacerbation of their COPD within the last 2 weeks. * In the opinion of the clinical investigator, participant could be put at risk of harm by having to perform any of the study procedures. * Unable to comprehend the study and provide informed consent e.g. insufficient command of English in the absence of someone to adequately interpret.