aphe·​re·​sis | \ ˌa-fə-ˈrē-səs How to pronounce apheresis (audio) \
plural aphereses\ ˌa-​fə-​ˈrē-​ˌsēz How to pronounce apheresis (audio) \

Definition of apheresis

: withdrawal of blood from a donor's body, removal of one or more blood components (such as plasma, platelets, or white blood cells), and transfusion of the remaining blood back into the donor

called also pheresis

Examples of apheresis in a Sentence

Recent Examples on the Web In late February — about a month after the letter arrived at her former family home in West Linn — Maestretti went to the hospital for a procedure called apheresis. oregonlive, 17 Apr. 2021 In order to maximize donations, most centers use standard apheresis technology that separates the plasma from the blood in real time and then pumps that blood back into the donor. Adrianna Rodriguez, USA TODAY, 8 June 2020 Donors can give whole blood — the plasma is separated out later — or donate plasma through a process called apheresis collection which separates out the plasma and puts red blood cells back into the donor’s body. Zaz Hollander, Anchorage Daily News, 14 Apr. 2020 The plasma donation process takes 30-40 minutes and is the same as with other plasma donations, using an apheresis machine to separate the blood components, according to Versiti. Evan Casey, Milwaukee Journal Sentinel, 8 Apr. 2020 The procedure, called apheresis, is similar to giving blood, except that the blood drawn from the patient is run through a machine to extract the plasma, and the red and white cells are then returned to the donor. Denise Grady, New York Times, 26 Mar. 2020 The Connecticut patients, two males with acute myeloid leukemia, each received a platelet unit made from the same apheresis donation, collected in Massachusetts. Susan Scutti, CNN, 13 June 2019 During the platelet donation procedure, a machine is used to separate the platelets in your blood from the other red blood cells and white blood cells through a process called apheresis. NBC News, 14 June 2019 When collecting platelets for a transfusion, a donor's blood is drawn into an apheresis cell separator machine, which extracts platelets and returns the rest of the blood into the donor, according to the American Red Cross. Susan Scutti, CNN, 13 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'apheresis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of apheresis

1977, in the meaning defined above

History and Etymology for apheresis

from -apheresis (as in plasmapheresis)

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The first known use of apheresis was in 1977

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Cite this Entry

“Apheresis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/apheresis. Accessed 28 Jan. 2022.

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More Definitions for apheresis


aphe·​re·​sis | \ ˌa-fə-ˈrē-səs \
plural aphereses\ -​ˌsēz How to pronounce apheresis (audio) \

Medical Definition of apheresis

: withdrawal of blood from a donor's body, removal of one or more components (as plasma, blood platelets, or white blood cells) from the blood, and transfusion of the remaining blood back into the donor

called also pheresis

— see leukapheresis, plasmapheresis, plateletpheresis

More from Merriam-Webster on apheresis

Britannica.com: Encyclopedia article about apheresis


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