Imperial Collage Healthcare

TB ELISPOT


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

Negative


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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