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What are Platelets?Platelets are blood cells that help control bleeding. When a blood vessel is
damaged, platelets collect at the site of the injury and temporarily repair the tear.
Platelets then activate substances in plasma which form a clot and allow the wound to
heal. What is Apheresis?Apheresis (ay-fur-ee-sis) is a special kind of
blood donation that allows a donor to give specific blood components, such as platelets.
During the apheresis procedure, all but the needed blood component are returned to the
donor. Why is Blood Separated?Different patients need different types of blood
components, depending on their illness or injury. After you donate whole blood, the unit
is separated into platelets,
red cells and plasma in our laboratory.
Only two tablespoons of platelets are collected from a whole blood donation. Six whole
blood donations must be separated and pooled to provide a single platelet transfusion.
However, one apheresis donation provides enough platelets for one complete transfusion --
that's six times the amount collected from a whole blood donation. Who Needs Platelets?Many lifesaving medical treatments require platelet transfusions. Cancer patients, those receiving organ or bone marrow transplants, victims of traumatic injuries, and patients undergoing open heart surgery require platelet transfusions to survive. Because platelets can be stored for only five days, the need for platelet donations is vast and continuous. Platelet transfusions are needed each year by thousands of patients like these:
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