methods used in blood donation camp
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The second method called apheresis consists of drawing blood from the donor, seperating the components using a centrifuge, storing the component required for transfusion and returning the remaining components to the donor. Usually the RBCs are transferred back to the donor while the plasma and platelets are put to good use. Apheresis may be carried out using specifically designed instruments. The first and the most common method is when whole blood is drawn from the donor and is collected in a plastic bag that contains anticoagulants and preservatives such as sodium citrate, phosphate, dextrose or adenine. The collected blood seperated into its components (mainly the RBCs and the plasma) and stored. It must be noted that most recipients need only certain components and do not require whole blood. Plasma can be used for transfusions and also to make medications. This is a carry over from the World War II times when dried plasma was usEd to treat wounds.
On an average 450-500 ml of blood is drawn from one individual at a time. This amount of blood, along with the anti coagulants present in the collection bag is referred to as ‘one unit’ of blood.
On an average 450-500 ml of blood is drawn from one individual at a time. This amount of blood, along with the anti coagulants present in the collection bag is referred to as ‘one unit’ of blood.
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