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Typically, a 300 ml batch of blood is removed at a time and centrifuged to separate plasma from blood cells. Continuous flow centrifugation: Two venous lines are used. This method requires slightly less blood volume out of the body at any one time, as it is able to continuously spin out plasma. Plasma filtration: Two venous lines are used.
The assembly (A–D), operation (E) and disassembly (F) of the platelet apheresis machine, which can be configured to separate other components as well. The various apheresis techniques may be used whenever the removed constituent is causing severe symptoms of disease. Generally, apheresis has to be performed fairly often, and is an invasive ...
Erythrocytapheresis can also be used for blood donations. The procedure is commonly done using automated red blood cell collection which involves the removal of two units of red blood cells. This includes either two standard units of red blood cells or one unit plus of red blood cells and another of either plasma or platelets.
a clear solution of blood plasma in the upper phase (which can be separated into its own fractions, see Blood plasma fractionation), the buffy coat, which is a thin layer of leukocytes (white blood cells) mixed with platelets in the middle, and; erythrocytes (red blood cells) at the bottom of the centrifuge tube.
In whole blood, red blood cells, white blood cells, and platelets are suspended within the plasma. The goal of plasma purification and processing is to extract specific materials that are present in blood, and use them for restoration and repair. There are several components that make up blood plasma, one of which is the protein albumin ...
Since the machine used to perform the procedure uses suction to draw blood out of a donor's body, some people who can give whole blood may have veins too small for platelet donation. Blood accounts for about 8% of body weight, so a 50 kg (110 lb) donor has about four liters of blood.
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Albumin is commonly used to replenish and maintain blood volume after traumatic injury, during surgery, and during plasma exchange. [3] Since albumin is the most abundant protein in the plasma its use may be the most well known, but many other proteins, although present in low concentrations, can have important clinical uses. [1] See table ...