TB ELISPOT
Category | Immunology |
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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 & container 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 |