Imperial Collage Healthcare


Test Background
This assay detects interferon-gamma (IFN-γ) secretion in response to stimulation with Mycobacterium tuberculosis antigens. A positive test indicates presence of TB infection but cannot be used to distinguish active disease from latent infection. The negative predictive value of this test for TB infection is 98 %.

Clinical Indications
TB infection

Reference Range


Sample Required
8mL sodium citrate (pale blue top) or 10 mL heparin (green top)
Samples must be received in the laboratory (Charing Cross) by 2pm Monday to Friday for the test to be performed

Sample Volume
See above

Turnaround Time
4 days

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