Pheresis (pronounced as fur-ee-sis) is a special kind of blood donation by which specific components of the blood can be separated. It came from a Greek word meaning 'to take away' or 'separate'. By this method, the blood components like plasma, erythrocytes, platelets, granulocytes (neutrophils and basophils), and agranulocytes (lymphocytes and monocytes) can be separated. The pheresis is done using a machine called a cell separator. The separation is based on density gradient centrifugation The separated components are collected in separate vials or specialized polythene bags in the machine.

The pheresis procedure, or apheresis, is often used to obtain stem cells from the peripheral blood of a person having a blood disease (such as leukemia), which are at a later time reinfused (often after some sort of processing) into that patient's bloodstream in a procedure known as an autologous bone marrow transplant. In this type of transplant, the sick person is his own donor. Similarly, the procedure is often used to obtain stem cells from a healthy person in a procedure known as an allogeneic bone marrow transplant. In this type of transplant, another person (whether related or not) is the donor.

See also Pheresis as treatment for:Myasthenia gravis

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  • pheresis — /feuh ree sis, fer euh /, n. Med. Informal. apheresis, esp. plasmapheresis. [prob. by construal of PLASMAPHERESIS as PLASMA + pheresis] * * * …   Universalium

  • 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… …   Medical dictionary

  • pheresis — noun 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 • Syn: ↑apheresis • Derivationally related forms: ↑apheretic (for: ↑apheresis) •… …   Useful english dictionary

  • pheresis — noun (plural phereses) Etymology: probably back formation from plasmapheresis Date: 1975 apheresis …   New Collegiate Dictionary

  • pheresis — noun apheresis …   Wiktionary

  • pheresis — phe·re·sis …   English syllables

  • pheresis — A procedure in which blood is collected, part of the blood such as platelets or white blood cells is taken out, and the rest of the blood is returned to the donor. Also called apheresis …   English dictionary of cancer terms

  • Plasmapheresis — Pheresis redirects here. It is not to be confused with Phoresis. Plasmapheresis Intervention ICD 10 PCS 6A5 ICD 9 CM …   Wikipedia

  • Apheresis — The process of removing a specific component from blood and returning the remaining components to the donor, in order to collect more of one particular part of the blood than could be separated from a unit of whole blood. Also called hemapheresis …   Medical dictionary

  • apheresis — noun, plural (aphereses) Etymology: from apheresis (as in plasmapheresis) Date: 1977 withdrawal of blood from a donor s body, removal of one or more blood components (as plasma, platelets, or white blood cells), and transfusion of the remaining… …   New Collegiate Dictionary

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