Table 1. Outcomes of the QuantiFERON®-TB Gold In-Tube test versus the tuberculin skin test among 856 U.S. Navy recruits who had blood collected and skin test placed.
| QFT-GIT results | ||||||
|---|---|---|---|---|---|---|
| TST Results | Recruit Category a | Negative | Positive | Indeterminate | Incomplete | All |
| < 5 mm | All | 726 | 9 | 5 | 45 | 785 |
| Low Risk | 489 | 5 | 3 | 38 | 535 | |
| Increased Risk | 237 | 4 | 2 | 7 | 250 | |
| ≥ 5 and < 10 mm | All | 10 | 0 | 0 | 0 | 10 |
| Low Risk | 7 | 0 | 0 | 0 | 7 | |
| Increased Risk | 3 | 0 | 0 | 0 | 3 | |
| ≥ 10 and < 15 mm | All | 19 | 0 | 0 | 0 | 19 |
| Low Risk | 4 | 0 | 0 | 0 | 4 | |
| Increased Risk | 15 | 0 | 0 | 0 | 15 | |
| ≥ 15 mm | All | 18 | 5 | 0 | 1 | 24 |
| Low Risk | 4 | 1 | 0 | 0 | 5 | |
| Increased Risk | 14 | 4 | 0 | 1 | 19 | |
| Incomplete | All | 18 | 0 | 0 | 0 | 18 |
| Low Risk | 12 | 0 | 0 | 0 | 12 | |
| Increased Risk | 6 | 0 | 0 | 0 | 6 | |
| All | All | 791 | 14 | 5 | 46 | 856 |
| Low Risk | 516 | 6 | 3 | 38 | 563 | |
| Increased Risk | 275 | 8 | 2 | 8 | 293 | |
QFT-GIT = QuantiFERON®-TB Gold In-Tube test; TST = tuberculin skin test.
a Navy recruits were categorized as having an “increased risk” for M. tuberculosis infection if they did not meet the “tuberculosis-suspect” criteria, but reported contact with someone with TB, birth (or residence >1 month) in a country where estimated TB prevalence exceeded 20 cases per 100,000 population, or having resided, worked, or volunteered >1 month in a homeless shelter, jail, prison, drug rehabilitation unit, hospital, or nursing home; or as having a “low risk” for M. tuberculosis infection if they were neither suspects nor at increased risk.