This document summarizes guidelines for diagnosing tuberculosis infection. It discusses the characteristics and performance of interferon gamma release assays (IGRAs) like QFT-IT and T-SPOT compared to the tuberculin skin test (TST). While IGRAs generally have higher specificity than TST, their sensitivity can be reduced in high prevalence settings. Factors like BCG vaccination, repeated exposures, and immunocompromise can affect test performance. Guidelines provide recommendations on using IGRAs and TST depending on the clinical setting and population. Further research is still needed to optimize IGRA testing methods and better predict which individuals will develop active tuberculosis.