Flexibility in sample processing may improve test utility of the quantitative antigen-specific T cell assay (T-SPOT.TB). We investigated whether delayed sample processing with and without the use of T-Cell Xtend, a proprietary reagent, impacted upon test accuracy.
Lung Infection and Immunity Unit, Division of Pulmonology & UCT Lung Institute, University of Cape Town, Department of Medicine, H floor, Old Main Building, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa.