apheresis
US /ˌeɪ.fə'ri.sɪs/
UK /ˌeɪ.fə'ri.sɪs/
1.
the medical procedure of separating blood into its components, removing one or more of them, and returning the rest to the donor or patient
:
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Platelet apheresis is commonly used to collect platelets for transfusion.
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Therapeutic apheresis can remove harmful substances from a patient's blood.