Medical Definition of Pheresis

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Reviewed on 12/11/2018

Pheresis: Procedure in which the blood is filtered, separated, and a portion retained, with the remainder being returned to the individual.

There are various types of pheresis. In leukapheresis, the leukocytes (white blood cells) are removed. In plateletpheresis, the thrombocytes (blood platelets) are removed. And in plasmapheresis, the liquid part of the blood (the plasma) is removed.

From the Greek "aphairesis" meaning withdrawal.

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Reviewed on 12/11/2018