If the symptoms of persistent cough and sputum appear at home, you should go to the hospital. Under the guidance of the doctor for examination, there are mainly the following kinds: 1, check the blood routine, blood routine during the acute attack of bacterial infection, the total number of white blood cells as well as neutrophil counts will be correspondingly high; 2, sputum test, bronchitis patients sputum is generally purulent in appearance, containing a large number of neutrophils; 3, X-ray examination, the early stage of the disease examination is not specific performance, but if the repeated acute attack, the patient’s lung texture appears to be thick, flocculation, mostly reticular or streaky and speckled shadows, which is a sign of bronchial inflammation, the patient’s lung texture is thicker. X-ray examination, there is no specific performance in the early stage of the disease, but if there are repeated acute episodes, the texture of the patient’s lungs appears to be thickened, there is flocculation, mostly in the form of reticulated or striated flocculent and speckled shadows, which is a more obvious evidence in the examination and diagnosis of bronchitis; 4, you can carry out a pulmonary function examination, the patient’s initial spirometry value has no obvious change, when the disease continues to develop, there will be obstruction of the airflow, and the patient’s volume and the lung volume or spirometric ratio of the patient’s exertion is significantly reduced. When the small airways become obstructed, the lung volume flow of the maximum respiratory capacity appears to be significantly reduced, while the closed volume increases.