TABLE 3.
Analysis of discrepancies in results for 50 culture-positive specimens
| Method for discrepancy resolution (n)a | Culture result | Type of specimen | No. of specimens with indicated initial MTD test result
|
Outcome | |
|---|---|---|---|---|---|
| Negative | Equivocal | ||||
| Confirm patient taking anti-TB drugs (23) | MTBC positive | Respiratory | 18 | 3 | Excluded |
| Nonrespiratory | 2 | Excluded | |||
| Repeat MTD test with second specimen (8) | MTBC positive | Respiratory | 3 | 4 | Result changed to MTD test positive |
| MOTT positive | Respiratory | 1 | True false positive | ||
| Repeat MTD test with 1:10 dilution (9) | MTBC positive | Respiratory | 9 | Result changed to MTD test positive | |
| None (specimen unavailable for repeat MTD test) (10) | MTBC positive | Respiratory | 9 | 1 | Unchanged |
a
n, number of specimens.