This is the modern, gold-standard blood test for Tuberculosis (TB). The IGRA test is a major advancement over the old, two-visit skin test. It requires only a single blood draw to provide a more accurate and reliable answer. This test doesn't check for the bacteria itself but for your immune system's memory of it, making it the most effective way to detect a 'latent' (sleeping) TB infection. This is the fastest, most convenient, and most precise way to get a definitive TB screen. One visit, one blood draw, one clear answer.