MTB Detected-Rif Indeterminate Results Interpretation in CBNAAT

The CBNAAT software displays the result as Rif Indeterminate when the early Cycle threshold (Ct) value is greater than 35, which suggests that the bacillary load in the specimen is very low.  

The software cannot calculate the difference in the Ct values, hence the result is declared 'Indeterminate'. ​ 

This can be seen in the figure below.

Figure: Ct>35 shows Rif Indeterminate Result

Resources

• Laboratory Diagnosis of TB by Sputum Microscopy – Handbook, GLI Initiative.

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