A Comparison of Diagnostic Testing Modalities in the Assessment of Asthma
This study aims to assess the concordance of international asthma guidelines in the diagnosis of asthma and explore the presence of airways disease using additional non-guideline physiologic criteria, such as IOS, not included in the guidelines, but available in the Portsmouth lung function service.
- EligibilityCriteria: Inclusion Criteria:  The patient will meet all the following criteria to be considered eligible for the study:  Aged 18 years or over. All patients who have attended full asthma workups from November 2021 till date Willing and able to consent to use their data in this study (opt-out form or e-consent). Patients referred to the Portsmouth asthma service for diagnosis and further management of presumed asthma. Comorbidities are common in asthma, thus patients with co-existing conditions such as obesity, bronchiectasis or COPD will be included.  Exclusion Criteria:  The participant may not enter the study if either of the following apply:  Unable to comprehend the study and provide informed consent, e.g., insufficient command of English in the absence of someone who can adequately interpret. Patients with other primary respiratory conditions, such as ILD. - HealthyVolunteers: Accepts Healthy Volunteers - Gender: All - StdAgeList: Child, Adult, Older Adult - StudyPopulation: The study population will consist of patients referred for specialist review from primary care and needing specialist review after emergency admission. This research will utilise historical and contemporary data from pulmonary function tests performed during the asthma workup at the Queen Alexandra Hospital, Portsmouth. The tests will include FeNO, Skin prick tests, Impulse Oscillometry, Spirometry, Gas transfer, lung volumes and Bronchodilator reversibility. - SamplingMethod: Non-Probability Sample