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Serum serial number invalid skin#
Both the standard qualitative test interpretation (positive, negative, or indeterminate) and the quantitative assay measurements (Nil, TB, and Mitogen concentrations or spot counts) should be reported.Īs with the tuberculin skin tests (TSTs), IGRAs should be used as an aid in diagnosing infection with M. IGRA interpretations are based on the amount of IFN-g that is released or on the number of cells that release IFN-g.
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What are the steps in administering an IGRA test?Ĭonfirm arrangements for testing in a qualified laboratory, and arrange for delivery of the blood sample to the laboratory in the time the laboratory specifies to ensure testing of samples with viable blood cells.
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To conduct the tests, fresh blood samples are mixed with antigens and controls. tuberculosis will release interferon-gamma (IFN-g) when mixed with antigens (substances that can produce an immune response) derived from M. White blood cells from most persons that have been infected with M. IGRAs measure a person’s immune reactivity to M.