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False negatives are test results reported as negative for a Mycobacterium species present in the patient specimen 

Practices that can lead to  false negative cultures are :

  1. Extended exposure to NaOH during processing

  2. High pH (insufficient neutralization during processing)

  3. Growth may be inhibited by:

    • addition of too much PANTA

    • loss of CO2 from MGIT vial headspace

     

Resource

MGIT 960 Growth Detection Oct09.ppt (1.46 MB)

 

 

 

Assessment

Question 1

Answer 1

Answer 2

Answer 3

Answer 4

Correct Answer

Correct Explanation

Page id

Part of Pre-Test

Part of Post-Test

False negatives are test results reported as negative for a Mycobacterium species present in the patient specimen.

 

True

False

 

 

True

False negatives are test results reported as negative for a Mycobacterium species present in the patient specimen.

 

 

Yes

Yes

Question 2

 

 

 

 

 

 

 

 

 

Extended exposure to NaOH during processing results in false negatives.

 

True

False

 

 

True

Extended exposure to NaOH during processing results in false negatives.

 

Yes

Yes

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