Assess Accuracy of Primary Care Asthma and COPD Diagnosis Using Oscillometry and FeNO vs Specialist Diagnosis

Inclusion Criteria: Patients are eligible to be included in the study if all the following criteria apply and after providing written informed consent: Suspected asthma (asthma group) 1. Patients ≥ 18 years old or with legal age of consent in the jurisdiction in which the study is taking place, at the time of signing the ICF. 2. Patients presenting with symptoms of wheezing, cough, chest tightness, shortness of breath, but without a clinically confirmed diagnosis of asthma. Suspected COPD (COPD group) 1. Patients ≥ 40 years old at the time of signing the ICF. 2. Patients presenting with symptoms of dyspnea, chronic cough or sputum production, but without a clinically confirmed diagnosis of COPD. Exclusion Criteria: Patients are excluded from the study if any of the following criteria apply: 1. Prior diagnosis of COPD or asthma. 2. Use of ICS in the last 6 months or use of oral corticosteroids in the last 3 months. 3. Any diseases that influence lung function result such as lung cancer, pneumonia, active pulmonary tuberculosis, pulmonary embolism, and interstitial lung disease. 4. Any history of recent surgery that affects lung function results, including but not limited to thoracotomy surgery, pneumothorax surgery, and thoracic drainage. 5. Contraindication to spirometry or oscillometry test, or allergy to bronchodilator. 6. Currently pregnant or breast-feeding women. 7. If the investigator judges that the patient is unlikely to comply with study procedures, restrictions, and requirements.