Blood transfusion therapy involves transfusing whole blood or blood components (specific portion or fraction of blood lacking in patient). One unit of whole blood consists of 450 mL of blood collected into 60 to 70 mL of preservative or anticoagulant. Whole blood stored for more than 6 hours does not provide therapeutic platelet transfusion, nor does it contain therapeutic amounts of labile coagulation factors (factors V and VIII).
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