CBNAAT Results Interpretation

On completion of a test run, the Cartridge-based Nucleic Acid Amplification Test (CBNAAT) gives the following results:

1. MTB DETECTED; Rif Resistance DETECTED
2. MTB DETECTED; Rif Resistance NOT DETECTED
3. MTB DETECTED; Rif Resistance INDETERMINATE
4. MTB NOT DETECTED
5. Error
6. Invalid
7. No result

Conclusive results include: MTB NOT DETECTED, MTB DETECTED with Rif Resistance/ without Rif Resistance.

Non-conclusive results include: MTB Detected, Rif Resistance Indeterminate, Errors, Invalid and No Result - the test has to be repeated in these cases.

Figure: CBNAAT Result Algorithm

Video : CBNAAT Results Interpretation

Resources

• Guidelines for Programmatic Management of Drug-resistant Tuberculosis in India, MoHFW, 2017.
• GeneXpert Dx System Operator Manual