How do you read a positive QuantiFERON gold test?
How do you read a positive QuantiFERON gold test?
Must be <8 to make test interpretable, usually near 0. CD8 activity (particularly if >0.6 iu)- the more likely new infection or active disease may be present. The QFT-plus test is interpreted as “positive” even if only one of the two TB tubes are > 0.35 iu.
What does your arm look like if your TB test is positive?
Your health care provider MUST check your arm 2 or 3 days after the TB skin test, even if your arm looks OK to you. If you have a reaction to the test, it will look like a raised bump. Your health care provider will measure the size of the reaction. If there is a bump, it will go away in a few weeks.
What does a good TB test result look like?
A 10 mm induration may also be considered positive in children under the age of 4 or people who use injected drugs. An induration of 15 mm or more is considered positive in anyone, even those who don’t think they’ve been exposed to anyone with TB.
Is QuantiFERON gold positive in active TB?
You have a positive Tuberculin Skin Test (TST) or QuantiFERON blood test: what does this mean? If your TST (Mantoux) or Quantiferon blood test was found to be positive, this means you have a latent TB infection, but usually not the active disease.
What is a nil result?
The NIL tube value indicates if the patient has an ongoing immune response which can cause a false-positive result. The NIL tube must be ≤ 8.0 IU/mL. Significance of the MITOGEN result: The mitogen control tube addresses the immune competence of the patient’s immune cells to produce interferon-γ.
What is the normal range for QuantiFERON TB Gold?
Conclusions. We recommend retesting of subjects with QFT results in the range 0.20–0.99 IU/ml to enhance reliability and validity of the test. Half of the subjects in the borderline range will be negative at a level <0.20 IU/ml when retested and have a very low risk of developing incident active TB.
What is a normal QuantiFERON TB Gold?
The QuantiFERONR TB Gold Plus (in Tube) assay is intended for use as an aid in diagnosis of TB infection….
| Components | Reference Interval |
|---|---|
| QuantiFERON-TB Gold In-Tube | Negative |
| QuantiFERON-TB1 minus NIL | 0.34 IU/mL or less |
| QuantiFERON-TB2 minus NIL | 0.34 IU/mL or less |
| QuantiFERON MITOGEN minus NIL | No reference interval |
What is the normal range of TB?
Table 2
| QFT result by category | Total number tested | Incident TB (3–24 months) |
|---|---|---|
| Negative (<0.2 IU/ml) | 28976 | 14 |
| Borderline negative (0.2–0.34 IU/ml) | 1664 | 2 |
| Borderline positive (0.35–0.99 IU/ml) | 1992 | 11 |
| Positive (>0.99 IU/ml) | 6712 | 65 |
