#apheresis__apheresi__pheresis  a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion
  supertype:  dialysis  separation of substances in solution my means of their unequal diffusion through semipermeable membranes
  subtype:  plasmapheresis  plasma is separated from whole blood and the rest is returned to the donor
  subtype:  plateletpheresis  platelets are separated from whole blood and the rest is returned to the donor

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