Tuberculosis test results usually need sputum culture or modified method to test, which usually takes about 2~6 weeks. 1. Sputum culture: tuberculosis mainly relies on sputum culture for diagnosis, as long as the growth of tuberculosis bacilli is cultured, the diagnosis can be clear, and the culture of tuberculosis mycobacteria is relatively long, usually takes 2~6 weeks; if the amount of tuberculosis bacilli in the patient’s sputum is relatively large, there is a possibility that the culture of tuberculosis bacilli can be positive in 2~3 days. 2. Improved method: If you use the improved method, such as Roche using bacterial metabolites to detect Mycobacterium tuberculosis, it usually takes about 2 weeks. If, after 8 weeks of culture, it is still not possible to culture the growth of Mycobacterium tuberculosis, the possibility of tuberculosis can be ruled out. Tuberculosis is a more contagious and at the same time more harmful disease, patients need to be actively treated under the guidance of specialists.