Lung function can be tested by measuring the ventilation function of the lungs, mainly to do a one-second volume or one-second rate of the examination, to see how much can be blown out per second, take a deep breath of air, inhale enough air and then blow vigorously to observe how long can be discharged out of the body.
Generally speaking, a normal person can blow out 70%-80% or nearly 90% of the air per second, and the air can be completely blown out in 3-4 seconds. If it can be blown out it means that the lungs are functioning normally. In severe cases of chronic obstructive pulmonary disease, it may take 6-7 seconds or even longer for the lungs to be completely expelled from the body. This method can be used for patients with expiratory dyspnea and patients with chronic obstructive pulmonary disease.
Alternatively, the test can be done by blowing out a candle. The farther away it can be extinguished indicates that the lungs are functioning better, and people with poor lung function may not be able to extinguish it within 15-20 centimeters, which is a sign of poor lung function. It is also possible to use a peak flow meter, for example, to test the sensitivity of the airways and how well the lungs are functioning.
Patients who test their lung function should go to the hospital for examination if they have any problems and undergo standardized treatment under the guidance of a doctor.