Eosinophil percentages, no matter how high, cannot be used to diagnose bronchial asthma with this one value alone. Eosinophil counts are elevated in sputum in most asthmatics, above 2.5%, but only indicate a correlation with asthma symptoms and cannot be used to diagnose asthma. The diagnosis of asthma needs to be based on the clinical symptoms and signs of typical asthma, as well as pulmonary function tests.
1. Typical clinical symptoms and signs: asthma is a disease characterized by chronic airway inflammation and airway hyperresponsiveness. Typical clinical manifestations of asthma are recurrent episodes of wheezing, shortness of breath, chest tightness, and in some cases coughing as a single symptom, which is usually more frequent at night and is related to exposure to allergens. During an attack, diffuse rales can be heard in both lungs.
2. Pulmonary function tests: When the above signs and symptoms are met, and wheezing, chest tightness, shortness of breath and other symptoms caused by other diseases are excluded, the patient undergoes the pulmonary function test for airflow limitation, and can be diagnosed as bronchial asthma with a positive bronchodilatation test, a positive bronchial provocation test, an average daily PEF diurnal variability of more than 10%, or a weekly variability of more than 20% of PEF, any of which can lead to the diagnosis of bronchial asthma.
The eosinophil percentage is not very specific for the diagnosis of disease and can be elevated by many conditions such as allergic diseases, parasites, parasites and certain malignancies.
Any discomfort should be treated promptly to avoid delay.