Approval for the use of t-cell xtend reagent with the t-spot. Tb test, in order to extend the time from sample collection to sample processing from within 8 hours of venipuncture to between 23 and 30 hours post venipuncture; and to make a technical correction to the t-spot. Tb test package insert to change the number of blood collection tubes required from (2) 6 ml heparin tubes to (1) 6 ml heparin tube. The t-cell xtend reagent is indicated for use with the t-spot. Tb test for the pre-treatment of whole blood prior to lymphocyte separation. The reagent aids in the removal of selected white blood cells from whole blood stored at room temperature (18-25 degrees c).
A substance or reactant intended to be used for the isolation of cells from a clinical specimen (e.g., lymphocytes from whole blood, cells from a liquid-based cytology specimen) using centrifugation and density gradient to achieve specimen component separation.