Apheresis
（重定向自Cytapheresis）
![](/Images/godic/202501/07/Apheresis.svg1152.png")
![Disinfect, insert the cannula, pull out the cannula, dress the wound. The blue pressure cuff is controlled by the platelet apheresis machine in newer models.](/Images/godic/202501/07/Blood_donation_needle1152.jpg")
![The assembly (A-D), operation (E) and disassembly (F) of the platelet apheresis machine which can be configured to separate other components as well.](/Images/godic/202501/07/Platelet_apheresis1152.jpg")
Apheresis (ἀφαίρεσις (aphairesis, “a taking away”)) is a medical technology in which the blood of a donor or patient is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. It is thus an extracorporeal therapy.