What tests do I need to do if I suspect asthma?

What tests do I need to do if I suspect asthma?

What tests do I need to do if I suspect asthma?

(1) blood routine: eosinophils can be increased at the time of onset, but some patients do not increase, if concurrent infection, the number of white blood cells can be increased;

(2) sputum examination: mostly viscous sputum, eosinophils in sputum can also increase;

(3) Pulmonary function test: Clinically, the ratio of forced expiratory volume (FEV1) to forced vital capacity (FVC) and peak expiratory flow rate (PEFR) were used to understand the presence or absence of airflow limitation. When FEV1/FVC <70%-75%, suggesting that the airflow is limited, the inhalation of bronchodilator increases 15% or more after 15-20 minutes, indicating reversible airflow limitation, and sometimes bronchial provocation test to help diagnose;

(4) Blood gas analysis: At the beginning of asthma attack, the patient has no obvious abnormal blood gas. As the disease progresses, hypoxia may occur, PaO2 decreases, and excessive ventilation may cause PaCO2 to decrease. At this time, the pH value rises and appears as a respiratory alkali. Poisoned. If the condition continues to progress, there may be hypoxia and CO2 retention, PaCO2 will rise, and the pH will decrease, showing respiratory acidosis;

(5) Chest X-ray examination: Most patients with asthma can have no obvious abnormalities in chest X-ray examination. Some patients may have emphysema manifestation, and the lungs on both sides are increased in brightness. The chest X-ray examination is mainly used to exclude other lung diseases;

(6) Allergen test: All kinds of allergens are tested in the skin for suspicious allergens. In addition, serum allergen-specific IgE determination has certain value, but serum total IgE determination has no diagnostic significance.