Gene Xpert Sputum

GeneXpert sputum refers to the GeneXpert MTB/RIF assay performed on a patient’s sputum to rapidly detect Mycobacterium tuberculosis DNA and mutations in the rpoB gene that confer rifampicin resistance. The cartridge-based, automated PCR test delivers results in about two hours, offers greater sensitivity than smear microscopy, and helps quickly diagnose tuberculosis and identify likely drug resistance for prompt treatment decisions.

Costs vary by country and setting. Under concessional pricing for public programs, the GeneXpert (Xpert MTB/RIF) cartridge runs about $10, with total program per-test costs often $15–30. In private labs, charges typically range $20–150 (≈₹700–3,000 in India). In countries with universal coverage (for example NHS settings) the test is usually provided free at the point of care.

GeneXpert is a rapid, automated molecular test platform that detects DNA/RNA of pathogens and common resistance mutations. It is widely used to diagnose tuberculosis (including rifampicin resistance) and respiratory infections such as COVID-19, influenza and RSV from sputum or nasal/throat swabs. Results are available within hours, aiding prompt diagnosis, infection control and timely treatment decisions in clinical and point‑of‑care settings.

GeneXpert (Xpert MTB/RIF) is a rapid, sensitive molecular test that detects Mycobacterium tuberculosis DNA and rifampicin resistance. A positive result is strong evidence and often used to start treatment, but a negative result does not fully exclude TB. Culture remains the diagnostic gold standard and is needed for full confirmation and comprehensive drug‑susceptibility testing.

A positive sputum test for TB means Mycobacterium tuberculosis has been detected in respiratory secretions by smear microscopy (acid‑fast bacilli), culture, or molecular assays (e.g., PCR/Xpert). It indicates active pulmonary tuberculosis, usually requires prompt anti‑TB treatment, assessment for drug resistance, chest imaging, and contact tracing. Further tests like HIV screening are recommended to guide management.

The gene test for TB is the GeneXpert MTB/RIF assay: a rapid molecular PCR test that detects Mycobacterium tuberculosis DNA and rifampicin-resistance mutations directly from sputum (or other samples) in about two hours. It’s highly sensitive, faster than culture, aids early diagnosis and treatment decisions, and complements drug-resistance assays (e.g., line-probe tests) for broader resistance profiling.