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Platelets are either isolated from collected units of whole blood and pooled to make a therapeutic dose, or collected by platelet apheresis: blood is taken from the donor, passed through a device which removes the platelets, and the remainder is returned to the donor in a closed loop. The industry standard is for platelets to be tested for ...
In a typical set of rules, a platelet donor must weigh at least 50 kg (110 lb) and have a platelet count of at least 150 x 10 9 /L (150,000 platelets per mm³). [2] One unit has greater than 3×10 11 platelets. Therefore, it takes 2 liters of blood having a platelet count of 150,000/mm³ to produce one unit of platelets.
Side effects can include allergic reactions such as anaphylaxis, infection, and lung injury. [2] Bacterial infections are relatively more common with platelets as they are stored at warmer temperatures. [2] Platelets can be produced either from whole blood or by apheresis. [1] They keep for up to five to seven days. [1]
One common definition of thrombocytopenia requiring emergency treatment is a platelet count below 50,000/μL. [5] Thrombocytopenia can be contrasted with the conditions associated with an abnormally high level of platelets in the blood – thrombocythemia (when the cause is unknown), and thrombocytosis (when the cause is known). [6] [7]
Originally, platelets were stored in the donor’s own plasma. Nowadays, many blood banks have switched to using platelet additive solution to store platelets. Typically, when platelets are isolated from whole blood, not all plasma is removed, as platelets need to be in a certain volume of plasma in order to have a clear separation from other ...
The time from when the incision is made until all bleeding has stopped is measured and is called the bleeding time. Every 30 seconds, filter paper or a paper towel is used to draw off the blood. The test is finished when bleeding has stopped. [6] A prolonged bleeding time may be a result from decreased number of thrombocytes or impaired blood ...
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