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  • Retesting MGIT DST Results

    Learning Objectives

    mention scenarios to retest results-unexpected results, discordance, new case, QC failure, controls do not grow etc

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Content

Retesting MGIT DST Results

Following are the instances when we need to re-test the MGIT DST results:

  • The final DST results are non-interpretable.
  • Unusual DST results, e.g., Mono-resistance, are obtained.
  • DST results disagree with the previous testing from the same patient.
  • Borderline resistance/susceptibility is identified.
  • The patient is a new untreated case and shows resistance (primary drug resistance).
  • Quality Control organisms fail to give expected results.
  • An unexpectedly high number of resistant isolates in a batch.

 

Resource

GLI Practical Guide to TB Laboratory Strengthening

 

 

Assessment

Question​

Answer 1​

Answer 2

Answer 3

Answer 4

Correct answer​

Correct explanation​

Page id​

Part of Pre-test​

Part of Post-test​

Retesting of MGIT DST is done for which of the following reasons?

The final DST results are non-interpretable.

Borderline resistance/susceptibility is identified.

Quality Control organisms fail to give expected results.

All the above

4

Retesting of MGIT DST is done if the final DST results are non-interpretable, if the organism is borderline resistant/susceptible or when QC organisms fail to give expected results.

 

YES

YES

 

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