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All products and services previously affiliated with Oxford Immunotec are now part of Revvity.

T-Cell Xtend®

The T-Cell Xtend reagent is an antibody complex that is added to blood samples in the laboratory immediately before running the T-SPOT®.TB test. The product was licensed throughout Europe in 2008 and gained FDA premarket approval in August 2010.

T-Cell Xtend package insert

The T-Cell Xtend reagent allows blood samples to be processed up to 32 hours after venepuncture without affecting the accuracy of the test.

With the T-Cell Xtend reagent, the T-SPOT.TB test offers IGRA users unrivalled flexibility:

  • Blood can be kept at room temperature for 32 hours prior to start of assay
  • Blood samples can be easily shipped overnight
  • Blood is collected in standard lithium heparin or sodium heparin tubes
  • Does not require dedicated collection tubes or shaking of tube