Monitoring Different Types of Errors with CBNAAT

While using the CBNAAT machine in a laboratory setting, many different causes can lead to an error (indicated on-screen as ‘ERROR’, as in figure 1).

Figure 1: Window showing how to click on “Errors” to learn more about the issue

Error Message Categories

The errors are displayed by the instrument’s software to highlight various technical issues that disrupt the test process. They are grouped into five categories by the software:

1. Cartridge loading errors: Errors that occur during a cartridge loading process
2. Self-test errors: Errors that occur during the self-test process
3. Run-time errors: Errors that occur during a test.
4. Operation terminated errors: Errors that abort a test
5. Post-run analysis errors: Errors that occur during the data reduction process

You can view the errors by clicking the ‘Check Status’ icon on the CBNAAT software, as seen in figure 2.

Figure 2: 'Check Status' Window of the CBNAAT Software

Monitoring of Errors and Invalid/ No Results

• Rates of errors and Invalid/ No Results need to be monitored by the module and user.
• Identifying the most frequent types of problems can help to troubleshoot since certain errors may be associated with a user’s technique in sample processing while others with mechanical problems with the instrument modules or room temperature.
• Recurring errors should be timely reported to the manufacturer.

Figure 3: Monitoring of Errors on CBNAAT

Video : Monitoring Different Types of Errors with CBNAAT

Resources

• GeneXpert Package Insert.
• Xpert MTB/RIF Training Package, Module 9, GLI Initiative