Today, Dr. Abhishek Shukla explained five important blood-based investigations that aid in the diagnosis of Tuberculosis (TB). The first is the Interferon-Gamma Release Assay (IGRA), a modern blood test that detects TB infection by measuring the immune system's response to Mycobacterium tuberculosis, specific antigens. It is particularly useful for detecting latent TB and is preferred in individuals who have received the BCG vaccine. A closely related test is the T-SPOT.TB, a type of IGRA that c