The accuracy of a positive genetic test for tuberculosis is relatively high, and a sputum smear is needed to further confirm the diagnosis of tuberculosis. Genetic testing has multiple advantages, fast and accurate, but is often used in scientific research, rarely used in clinical, so positive genetic test for tuberculosis also need to do sputum smear to confirm the diagnosis. The main method of tuberculosis detection is sputum smear, which is simple, feasible and highly accurate. Tuberculosis is diagnosed when Mycobacterium tuberculosis is found in the sputum. Generally, three types of sputum samples should be examined first, i.e., nocturnal sputum, morning sputum and immediate sputum. The diagnosis of tuberculosis can be confirmed by a sputum smear that detects antacid bacilli, a sputum culture that is positive for Mycobacterium tuberculosis or a sputum test that is positive for Mycobacterium tuberculosis DNA. If you have cough, sputum, low-grade fever and night sweats (sweating abnormally after going to sleep and stopping after waking up), it is recommended that you go to the hospital promptly for medical consultation and sputum smear test, and if it is positive, please take treatment measures immediately.