NHS Scotland Blood Transfusion Service has a requirement for 1 4-Laser Flow Cytometer for the detailed analysis of donor or patient platelets, erythrocytes and leucocytes (including rare cells such as stem cells and antigen-specific T cells) and for more specialist applications including: The co-detection of reporter proteins and multiple surface markers or the analysis of cytokines; by the Scottish National Blood Transfusion Service (SNBTS) Research, Development and Innovation (RDI) Directorate.