Facts about Blood Donation      
  Types of Blood Donation.   Screening  
  Blood donations are divided into groups based on who will receive the collected blood. "Allogeneic" (homologous) donation happens when a donor gives blood for storage at a blood bank and transfusion takes palce to an unknown recipient.

A "directed" donation happens when a person donates blood for transfusion to a specific individual.

A "replacement donor" donation is found usually in developing countries. In this case, a friend or family member of the recipient donates blood to replace the stored blood that is used in a transfusion, ensuring a consistent supply.
  Donors are required to give consent for the process and this requirement means minors cannot donate without permission from a parent or guardian. The donors race or ethnic background is sometimes considered for certain blood types, especially rare blood groups.  
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