Optimizing Blood Collection and Processing for Quantiferon-TB Gold in-Tube Testing Gives Low Rates of Indeterminate Results: Clinical Implications

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Abstract

The rate of low-mitogen indeterminate interferon-gamma release assay results at a hospital with expert pediatric phlebotomy and rapid incubation of specimens was 0.96%. All low-mitogen indeterminate results were found to be associated with an immunocompromised or anergic state. We describe a child where an unexpected indeterminate interferon-gamma release assay test pointed to an underlying anergic condition and was of diagnostic significance.

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