Factors Influencing the Indeterminate Results in a T-SPOT.<i>TB</i> test: A Matched Case-control Study

Abstract

Objective A T-SPOT.TB can yield indeterminate results under two test observation conditions: a high response to the nil in negative control wells (high nil-control) or a low response to the mitogen in positive control wells (low mitogen-control). The most strongly influential factors for these indeterminate results, however, have yet to be identified.