Alveolar lavage should be bronchoalveolar lavage, bronchoalveolar lavage is usually able to detect tuberculosis. Bronchoalveolar lavage is a test developed on the basis of bronchoscopy, which is mostly used to examine lung diseases, study the pathogenesis, etiology, therapeutic evaluation, prognosis and treatment of some lung diseases, etc. Therefore, bronchoalveolar lavage can generally detect tuberculosis. Bronchoalveolar lavage is a method that generally utilizes a bronchoscope to inject saline into the bronchial alveoli and then aspirate it out, and the operator collects the effective fluid from the surface layer of the alveoli and examines the pathogenic microorganisms, soluble substances, and cellular components in the effective fluid. It is important to note that patients with severe cardiac arrhythmia, heart failure, severe coagulation disorders, and multiple pulmonary alveoli at risk of rupture are prohibited from undergoing this test to avoid aggravation of their condition. If the diagnosis of tuberculosis is confirmed, the cause of the disease needs to be clarified in time and treated.