Pulmonary function test general knowledge 1, which patients need to do pulmonary function test According to statistics, the incidence of chronic obstructive pulmonary is about 8%, especially the smoking population over 40 years old, the high incidence of chronic obstructive pulmonary; but the early stage of chronic obstructive pulmonary patients have no obvious symptoms, the symptoms appear when the lung function has been damaged 50%; once the onset of the flu, the diagnosis is too late, it is recommended that the smoking population over 40 years old or the existence of chest suffocation, shortness of breath. Pulmonary function tests should be performed as early as possible for early treatment. 2.How often do patients with chronic obstructive pulmonary disease have their lung function checked? Even if patients with chronic obstructive pulmonary disease are stable, i.e. without obvious symptoms such as cough and sputum, they should be treated for a long time to slow down the decline of lung function and reduce the number of acute aggravations. The treatment of chronic obstructive pulmonary disease should be evaluated according to the patient’s symptoms, the number of acute exacerbations and the degree of lung function damage. It is divided into four stages: A, B, C and D. The corresponding bronchodilators are selected according to the stage. Therefore, patients should be evaluated for changes in lung function every 3-6 months for targeted treatment at the first visit. 3.When and how to do pulmonary function test for asthma patients Pulmonary function of asthma patients should be tested regularly at the time of diagnosis, 3-6 months after starting treatment and every 3-6 months thereafter, and further examination should be done if it is not consistent with the symptoms; this is because asthma is a chronic airway inflammatory disease that requires long-term anti-inflammatory treatment with hormone-containing inhalation preparations. Anti-inflammatory therapy is a double-edged sword and requires a stepwise treatment plan based on changes in the patient’s symptoms, signs and lung function tests, i.e., constant revision of the dose of inhaled medication or even temporary discontinuation of inhaled medication to avoid asthma attacks and control adverse drug reactions. Therefore, please try to choose professional or specialist outpatient clinic to ensure systematic treatment. 4, and those patients who need to do pulmonary function test Long-term chest shortness of breath, chronic cough with unknown diagnosis, rheumatism, rheumatoid arthritis and other rheumatic diseases, all need to do pulmonary function test to clarify whether there is lung damage. Those who need thoracic and abdominal surgery or those who smoke or are elderly need pulmonary function to evaluate the risk of surgery.