Lung breath-holding tests are not used in the methods of testing lung function and there are certain health risks associated with lung breath-holding, which can predispose to serious cardiovascular disease, and it is not recommended to perform the test blindly on your own. Lung function testing is an important method for assessing chest and lung disease and respiratory physiology, and it is a non-invasive test. However, there is no such thing as a lung breath-holding method in performing lung function tests. The more commonly used method as opposed to lung breath-holding is spirometry, in which a deep inhalation is followed by a single maximal exhalation, and the volume of all the exhaled air represents the maximum functional activity of the lungs at one time. Lung breath-holding test has serious health risks for people with severe cardiac instability, angina pectoris, hemoptysis, epilepsy, and myocardial infarction. The process of breath-holding can easily lead to an increase in blood pressure, which induces a serious negative cardiovascular event and is a direct threat to life and health. When you need to clarify the lung function, you should consult a doctor for standardized examination, do not take the lung breath-holding test by yourself, in order to prevent delaying the diagnosis of the disease, there are also huge health risks.