The Mycobacteria Growth Indicator Tube (MGIT) system is widely used for the rapid culture and detection of Acid-Fast Bacilli (AFB), particularly Mycobacterium tuberculosis (MTB Complex), from various sterile and non-sterile body fluids. This is especially critical for diagnosing extrapulmonary tuberculosis (EPTB), which can be challenging.
1. Specimen Types (Common Body Fluids)
Cerebrospinal Fluid (CSF): For tuberculous meningitis (TBM).
Pleural Fluid: For tuberculous pleurisy.
Peritoneal Fluid (Ascitic Fluid): For tuberculous peritonitis.
Pericardial Fluid: For tuberculous pericarditis.
Synovial Fluid: For skeletal/joint TB.
Biopsy Homogenates: From tissues like lymph nodes, liver, bone marrow.
Urine: For genitourinary TB.
Blood: Though less common, can be used for disseminated TB, especially in immunocompromised individuals.
Pus/Aspirates: From abscesses or other collections.