VWB hosted a blood drive day on the 26th of October 2012 in conjunction with the SANBS and would like to thank our employees, clients and suppliers who formed part of this great project. Support the SANBS and be a hero! Frequently asked question and answer: Can a unit of blood save more than one life? Blood is composed of several different elements, namely red cells, plasma and platelets, each of which fulfils a particular function. These can be used for specific purposes so that each unit of blood can be used for more than one patient.