The main tests for tuberculosis are chest CT, sputum TB smear, routine blood tests, biochemical tests, etc. Most of these tests require fasting for more accurate test results. Especially for sputum TB smear, the food residue after eating will affect the test results, so it is better to have sputum on an empty stomach to have more diagnostic significance. It is necessary to check liver function and kidney function, which can clarify the damage caused by anti-tuberculosis drugs and whether the patient’s liver and kidney functions are normal, which is a strong guide for the application of drugs. The examination of tuberculosis should be performed regularly to provide good guidance for treatment, and patients should come to the examination on an empty stomach and eat after the examination.