The Canadian Blood Services says, too many prospective stem cell donors decline to help patients when asked. Doctor Heidi Elmoazzen, Director of Stem Cells at Canadian Blood Services says, “Currently, when potential donors on Canadian Blood Services Stem Cell registry are contacted to donate stem cells for a patient, only about 50 per cent of them follow through.” The target is 80 per cent. CBS says, in some cases, the decision not to donate is driven by important health or other person reasons. However, prospective donors should understand that joining the registry is a long-term commitment. CBS is asking prospective stem cell donors to re-affirm their commitment to patients.