BD Vacutainer™ Mononuclear Cell Preparation Tube (CPT™) The one-step, closed-system tube for blood collection, mononuclear cell separation and transportation Contributes to increased lab productivity by offering convenience, safety and reproducibility CPT Cell Preparation tubes are an evacuated blood collection tube system containing either 0.1 M sodium citrate anticoagulant or sodium heparin anticoagulant Tubes also contain blood separation media composed of a thixotropic polyester gel and a FICOLL™ Hypaque™ solution