2, try to use tight mouth, to ensure that the test does not leak.
3. Try to use the operator's password to exhale and inhale immediately.
Inhale as much as possible, and then exhale with the greatest strength and the fastest speed.
Pulmonary function examination is mainly used for the following purposes:
1, early detection of lung and respiratory diseases.
2. Determine the cause of dyspnea and the location of airway obstruction.
3. Assess the severity of lung diseases.
4. Evaluate the tolerance of operation and the possibility of postoperative complications.
5. Physical examination, labor intensity and endurance lung function examination can only show the changes of lung physiology and pathophysiology, but can't prompt the etiological diagnosis and lesion location of the lesion, and can only show the pathophysiological changes of large-scale lesions, but can't prompt the functional changes of small localized lesions.