There are many tests that can be done to examine the lungs and bronchi, and it is necessary to choose the appropriate test depending on the purpose of the examination. If you want to know the morphological changes in the lungs and bronchi and mediastinum, you can complete chest X-ray and chest CT, which is clearer than chest X-ray. If you want to know the functional changes of the lungs and bronchi, you can improve the pulmonary function test. Bronchoscopy can also be done if you want to clarify bronchial lining lesions or whether there is a bronchial foreign body, etc. Therefore, it is important to choose the appropriate tests according to different symptoms in order to make accurate treatment.