: Mycobacterium tuberculosis complex DNA, Sputum, Qualitative, Nucleic Acid Probe

: What This Test Measures

: The test detects DNA belonging to the Mycobacterium tuberculosis complex, the group of bacteria responsible for tuberculosis. Because it targets genetic material, it can identify the bacteria directly rather than relying on the body's immune response, and results may be available sooner than traditional culture methods.

: Why It Is Ordered

: A healthcare provider may order this test when a person has symptoms such as a persistent cough, fever, night sweats, or weight loss, or when there has been known exposure to tuberculosis. It is often used together with imaging and other tests to help diagnose or rule out active tuberculosis.

: How the Sample Is Collected

: The test uses sputum, the mucus coughed up from the lungs. You will likely be asked to cough deeply and collect the sample in a sterile container, sometimes on more than one day. Follow the collection instructions carefully, since a good-quality sample improves the reliability of the result.

: What the Results Mean

: A detected result means tuberculosis bacteria DNA was found and supports further evaluation and public health reporting. A not-detected result means the DNA was not found, but it does not by itself always exclude tuberculosis, so your provider will interpret it alongside symptoms, imaging, and other tests. Results are reported as qualitative (detected or not detected) rather than as a number.