JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Blood platelet donation. Man donates blood platelets at an apheresis clinic. In the foreground is a double-dosage apheresis machine which separates blood components producing two doses of platelets from each donor. Tubes from the man's arm show blood emerging from, and being returned to, his bloodstream. By the process of apheresis, blood is collected from the patient's arm and centrifuged. The red cells are returned to the donor, while platelets are collected in a sterile blood bag. Platelets play an important role in normal blood clotting. Platelet donations are given to leukaemia patients who cannot produce enough platelets of their own.
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