Table 2

Technical tips for IGRA

Technical tips for IGRA
DoDo not
Liaise with your lab in advance to obtain correct bottles and plan test timing

Fill test bottles accurately (3×1 ml for QFT-GIT, 5 ml for T-SPOT.TB)
Gently invert QFT-GIT bottles 10 times to mix
Ensure filled QFT-GIT bottles reach the lab within 12 h, and T.SPOT.TB bottles reach the lab as soon as possible
Assume the test can be done at any time, particularly in the evening or weekends

Overfill or underfill test bottles, send blood in other bottles
Shake QFT-GIT test bottles vigorously
Delay transit of samples to the lab
  • IGRA, interferon γ release assays.