1) Transfusion medicine 
Leukapheresis is a laboratory procedure in which white blood cells are separated from a sample of blood. It is a specific type of apheresis, the more general term for separating out one particular constituent of blood and returning the remainder to the circulation. Leukapheresis may be performed to decrease a very high white blood cell count, to o...
Removal of the blood to collect specific blood cells. The remaining blood is returned to the body.
The preparation of leukocyte concentrates with the return of red cells and leukocyte-poor plasma to the donor. ... (12 Dec 1998) ... 
(loo″kә-fә-re´sis) the selective removal of leukocytes from withdrawn blood, which is then retransfused into the donor.
Type: Term Pronunciation: lūk′ă-fĕ-rē′sis Definitions: 1. A procedure, analogous to plasmapheresis, in which leukocytes are removed from the withdrawn blood and the remainder of the blood is retransfused into the donor.
leukapheresis, leucaphresis A method of obtaining supplies of white blood cells from a compatible donor for use in the treatment of otherwise uncontrollable infection in a patient with acute leukemia.