Tuberculin blood tests usually do not require fasting. Tuberculin blood tests are mainly lymphocyte spot tests, also known as Tspot. a positive lymphocyte spot test indicates a current TB infection or previous TB spp. infection, and is a strong guide to diagnosing TB. Fasting is not usually required before a tuberculin blood test. However, in the process of diagnosis and treatment of anti-tuberculosis, usually not only do this one test, may also need to check the liver function, blood routine, blood sedimentation, sputum smear antacid bacilli, etc., of which the liver function test needs to be fasting, and after eating may lead to transaminase elevation, which will affect the results. Therefore, when doing tuberculin blood test, you can do it without fasting if it is done alone, but if the blood is drawn at the same time with other tests, fasting may be required.