Lung function is what to check.

Lung function test is a test method to test whether the respiratory system is healthy. This test is basically harmless to the human body. It will neither contact radiation nor cause pain or discomfort. It only requires you to breathe under the guidance of the operator and then to the airflow sensor. Although it is relatively simple to do, it reflects the situation is very comprehensive, it can reflect the ventilation of the lungs, that is, whether the trachea is unobstructed. For example, whether there is obstruction in the air outlet and exhalation, such as chronic obstructive pulmonary disease, which is often formed by smoking, and temporary obstruction caused by asthma patients, can be displayed on the ventilation function. In addition, it can also measure the ventilation function, that is, the oxygen uptake function of the alveoli. If there are some special diseases that cause hypoxia, lung function can be seen as a result of what causes hypoxia, such as insufficient lung volume or atrophy contracture, or a decline in diffusion function caused by interstitial lung disease, it can be identified. Therefore, lung function can be more indicative of the respiratory examination than X-ray, which is especially suitable for popularization.