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Documentation of MGIT Cultures
Learning ObjectivesDescribe documentation practices for MGIT results
Documentation of MGIT cultures is important to characterise if growth is positive for M. tuberculosis or unexpected result/contamination. The growth is tested for AFB by ZN microscopy and sterility by inoculation on the BHI agar/LJ slant.
The documentation of growth is as follows:
MGIT Machine Result |
Growth Characteristics |
ZN Result |
BHI agar/LJ slant result |
Documentation |
Positive |
Flakes like growth |
Positive |
No growth |
M. tuberculosis complex detected |
Positive |
Flakes like growth Plus turbidity |
Positive |
Growth |
M. tuberculosis complex detected with contamination |
Positive |
Flakes like growth
|
Positive |
No Growth |
M. tuberculosis complex not detected but positive for NTMs |
Positive |
Turbidity |
Negative |
Not Applicable |
Contamination |
Negative |
No growth |
Not Applicable |
Not Applicable
|
Negative for M. tuberculosis complex |
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 |
Flaky and turbid positive MGIT growth indicates which of the following? |
M. tuberculosis complex with contamination |
M. tuberculosis complex |
M. tuberculosis complex not detected |
NTM detected |
1 |
Flaky and turbid positive MGIT growth indicates M. tuberculosis complex with contamination. |
|
Yes |
Yes |
Question 2 |
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Flakes like growth, MGIT positive but does not grow on BHI/LJ indicates which of the following?
|
M. tuberculosis complex with contamination |
M. tuberculosis complex |
M. tuberculosis complex not detected but positive for NTMs |
E. coli detected |
3 |
Flakes like growth, MGIT positive but does not grow on BHI/LJ indicates M. tuberculosis complex not detected but positive for NTMs.
|
|
Yes |
Yes |
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