Table 1: Interpretation criteria for the QuantiFERON-TB Gold In-Tube assay (QFT-GIT) [20].
|
Result |
IFN-v concentration (International Units per ml, IU/ ml) |
||
|
|
M. tuberculosis antigens |
Nil |
PHA nil |
|
Positive |
≥ 0.35 IU/ml and ≥ 25% over nil |
≤ 8.0 IU/ml |
Any |
|
Negative |
< 0.35 IU/ml or < 25% over nil |
≤ 8.0 IU/ml |
≥ 0.5 IU/ml |
|
Indeterminate |
< 0.35 IU/ml or < 25% over nil |
≤ 8.0 IU/ml |
< 0.5 IU/ml |
|
|
Any |
> 8.0 IU/ml |
Any |