Tuberculosis infection T-cell test, also known as tuberculosis interferon release test, is a test used to detect whether the body is infected with tuberculosis bacteria, and is an important test indicator in conjunction with clinical diagnosis. If the tuberculosis infection T-cell test is positive, the possibility of tuberculosis infection is considered. Also, if there are obvious lesions in the lungs and tuberculosis bacteria are detected in the sputum, the diagnosis of tuberculosis can be confirmed, which then requires systematic anti-tuberculosis drug treatment. However, if only a single positive T-cell test for tuberculosis bacilli is of little significance in the diagnosis, the application of T-cell testing in the diagnosis of tuberculosis can improve the accuracy of the diagnosis to some extent. Most TB infections have a series of clinical symptoms such as low-grade fever, malaise, night sweats, etc. Different sites of TB are accompanied by other symptoms, such as pulmonary TB can have cough, sputum or even hemoptysis and difficulty in breathing. If infected with TB bacilli, TB infection T cells may be positive, but positive TB infection T cells cannot determine whether it is active TB now or once infected with TB. TB can be diagnosed only when TB bacilli are found in sputum together with laboratory tests, blood tests, blood sedimentation, chest CT, etc. Moreover, finding TB bacilli in sputum is the gold standard for diagnosing TB.