Blood donation
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Blood donation is the process of giving blood to be used for medical purposes, including blood transfusions. Some blood donors are able to give blood platelets by apheresis; the process is lengthier (around two hours per donation) but can be undertaken every four weeks, rather than around three times a year for regular donation.
Some religious groups such as Jehovah's Witnesses do not agree with the donation or receipt of blood for conscientious reasons.
Further information
US & Canada: http://www.bloodcenters.org/aboutblood/bloodfacts.htm
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