GeneXpert TB Test (CBNAAT) in India
Quick answer
GeneXpert, called CBNAAT in India, detects TB bacteria DNA in sputum or other samples within hours. It also shows resistance to rifampicin, a key TB drug. It is widely used to diagnose active TB quickly.
Medically reviewed by The Curaventa Team · Last updated 2026-10-24
Why it is done
- In persistent cough, fever or weight loss.
- To test lymph node, fluid or tissue samples.
- To screen for drug-resistant TB.
- In TB contacts with symptoms.
How it works
- A sputum or tissue sample is processed in a cartridge machine.
- Results show presence of TB DNA and rifampicin resistance.
- Culture may be added for full drug sensitivity.
Preparation
- Collect early-morning sputum, not saliva.
- Rinse your mouth with water first.
When results are ready
Usually within a day.
For international patients
Fast results suit a short stay. If TB is found, treatment usually continues for months at home; ask for a treatment card and a summary your local TB programme can accept.
Frequently asked questions
Can it detect TB outside the lungs?
Yes, on suitable fluid or tissue samples.
Does a positive result always mean active TB?
Usually, with symptoms. Doctors confirm with the whole picture.
Why add culture?
To test resistance to more drugs.
Medically reviewed by The Curaventa Team. Last updated 2026-10-24. General information, not medical advice. Medical editorial board · Editorial policy · How we get prices
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