The usual standard for spirometry is 2500-4000 ml of lung capacity, with some differences for men and women. Another measure of spirometry is the first second mid-second forceful inspiratory spirometry FEV1, which is usually greater than 85%. There are many indicators of spirometry, such as tidal volume and physiologic void space. For example, the standard tidal volume is 400-500 ml, while the physiologic void cavity is 150-200 ml of void gas. For the lung capacity of healthy adults, with the change of physical function and the increase of exercise intensity, the lung capacity also has a certain increase, so usually the measurement of lung capacity is relatively rough, and the lung capacity detected by the instrument is relatively accurate.