The transfer of blood components such as erythrocytes, leukocytes, platelets, and plasma from a donor to a recipient or back to the donor. This process differs from the procedures undertaken in PLASMAPHERESIS and types of CYTAPHERESIS; (PLATELETPHERESIS and LEUKAPHERESIS) where, following the removal of plasma or the specific cell components, the remainder is transfused back to the donor.

The transfer of erythrocytes from a donor to a recipient or reinfusion to the donor.

The introduction of whole blood or blood component directly into the blood stream. (Dorland, 27th ed)

The transfer of blood platelets from a donor to a recipient or reinfusion to the donor.

Centers for collecting, characterizing and storing human blood.

Any procedure in which blood is withdrawn from a donor, a portion is separated and retained and the remainder is returned to the donor.

'Blood donors' are individuals who voluntarily and safely donate a specific amount of their own blood, which can be further separated into components, to be used for transfusion purposes or for manufacturing medical products, without receiving remuneration that is intended to reward them financially.

The removal of LEUKOCYTES from BLOOD to reduce BLOOD TRANSFUSION reactions and lower the chance of transmitting VIRUSES. This may be performed by FILTRATION or by CYTAPHERESIS.