MTB PCR by GeneXpert is a highly sensitive and specific molecular diagnostic test designed to detect the presence of Mycobacterium tuberculosis (MTB) DNA in clinical samples, such as sputum, bronchoalveolar lavage (BAL) fluid, or cerebrospinal fluid (CSF). The test utilizes real-time polymerase chain reaction (PCR) technology combined with automated sample processing, amplification, and detection systems provided by the GeneXpert platform.