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    السلام عليكم ورحمة الله و بركاته


    Blood Preservation and Storage

    Blood is collected as whole blood, as shown below

    Blood can be stored as whole blood (with all of the plasma present) or, much more commonly, as packed red blood cells (PRBC's) in which about 70% of the plasma has been removed. This is done by light centrifugation, as shown below

    The platelet rich plasma can then be expressed off, leaving packed red blood cells (PRBC's) as shown here



    Both whole blood and PRBC's can be stored for up to 42 days at 1 - 6 degrees C.

    The plasma can be centrifuged heavily a second time to separate the platelet rich plasma, as shown below



    The supernatant plasma can be expressed into a third bag and stored as fresh frozen plasma (FFP). The remaining platelet rich plasma is utilized as a platelet pack, as shown below

    As can be seen in the above diagram, a single donation of whole blood has supplied three separate components (packed red blood cells, platelets, fresh frozen plasma) that can potentially benefit three different patients.

    After the expiration date, rare or valuable blood units can be "rejuvenated" with a biochemical solution that restores much of the original biochemical environment of the RBC's. The "rejuvenated" units are "washed" with isotonic saline in an automated device and then can be transfused as a saline-red blood cell suspension within 2 to 4 hours, or these units can be stored glycerolized and frozen for up to 10 years.

    Cryopreservation of RBC's is done to store special, rare RBC's for up to 10 years. The RBC's are first incubated in a 40% glycerol solution which acts as an "antifreeze" within the cells. The units are then placed in special sterile containers in a deep freezer at less than -60 degrees C.

    Cryopreserved units are thawed and washed free of glycerol prior to use as saline suspended RBC's. These units must be used in 2 - 4 hours to prevent possible bacterial contamination. The washed units are depleted of plasma and leukocytes.

    Cryopreserved blood can help to maintain stores of Rh negative blood, to provide units for persons with antibodies to high-incidence antigens or persons difficult to cross-match because of multiple alloantibodies and to provide plasma-free blood to persons with IgA deficiency.

    Thus, the types of RBC products available are:

    Whole blood.

    Packed red blood cells (PRBC's)

    Leukocyte depleted RBC's: cryopreserved blood that is thawed and degylcerolized is depleted of leukocytes, but much better depletion can be obtained by filtering the blood through leukocyte-specific filters.

    Frozen, deglycerolized RBC's
    الموضوع منقول للفائدة

  • #2
    :sm189::sm189: شكرا :sm189::sm189:

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    • #3
      الله يعطيك العافية

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      • #4
        بارك الله فيكي
        :extra59: العلم نور :extra57:

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        • #5
          المشاركة الأصلية بواسطة الوردة الحمراء مشاهدة المشاركة
          :sm189::sm189: شكرا :sm189::sm189:

          جزاكي الله خيرا
          لا شكر على واجب
          شكرا جزيلا

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          • #6
            المشاركة الأصلية بواسطة الشواطي مشاهدة المشاركة
            الله يعطيك العافية
            جزاك الله خيرا
            شكرا جزيلا

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            • #7
              المشاركة الأصلية بواسطة nour a مشاهدة المشاركة
              بارك الله فيكي
              جزاكي الله خيرا
              شكرا جزيلا

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              • #8
                يعطيك الف عاافية...
                http://up1.m5zn.com/photo/2009/1/24/...36kx6u.jpg/jpg

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                • #9
                  المشاركة الأصلية بواسطة laboratory girl مشاهدة المشاركة
                  يعطيك الف عاافية...

                  جزاكي الله خيرا
                  شكرا جزيلا

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                  • #10
                    جزاكي الله الخير العميم في الدنيا و الآخرة أيتها الأخت الكريمة
                    عيادة الدكتور أحمد بكور لطب الأطفال
                    أهم مواضيع عيادة الدكتور أحمد بكور لطب الأطفال

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                    • #11
                      المشاركة الأصلية بواسطة أحمد مهدي بكور مشاهدة المشاركة
                      جزاكي الله الخير العميم في الدنيا و الآخرة أيتها الأخت الكريمة
                      آمين
                      و إياك يا دكتور أحمد
                      بارك الله فيك
                      شكرا جزيلا

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