The duration of a TB test depends on the type you opt for: either the skin test or the blood test. For a TB skin test, the process necessitates two to three appointments with a healthcare professional. In the initial visit, a fluid is injected into your arm. During the subsequent visit, your skin's reaction to the injection is evaluated. If the results remain negative, a third visit (after 72 hours) becomes necessary. In contrast, the blood test is a brief procedure lasting only a few minutes. After a healthcare provider collects your blood sample, it is sent to a laboratory for analysis. Once the test outcomes are available, your healthcare provider will communicate the results to you.