LSU Book - Immunohematology

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1
Collection of Donor Blood
  • Registration, medical history and physical examination

  • Aseptic technique, scrub site for minimum 30 seconds - providine-iodine scrub

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Donor Selection and Blood Collection - Maximum collection
* No more than 10.5 mL of whole blood per kg of body weight, including samples
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Donor Selection and Blood Collection - Donor interval
* 8 weeks after Whole Blood donation
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Donor Selection and Blood Collection
* MD must evaluate medications
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Donor Selection and Blood Collection
* Medications taken within 48 hours that irreversibly affect platelet function (i.e., aspirin) may not be used as the __only__ source for platelets but can be part of a platelet pool
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Criteria for Allogenic Donor Selection - Age
* ≥ 16 years or conform to state law no max (evaluate by M.D.)
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Criteria for Allogenic Donor Selection - Temperature (oral)
*  ≤ 37.5 degrees Celsius or ≤ 99.5 degrees Fahrenheit
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Criteria for Allogenic Donor Selection - Blood Pressure
  • 90-180 mmHg Systolic

  • 50-100 mmHg Diastolic or Medical Director exception

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Criteria for Allogenic Donor Selection - Hgb/Hct
* ≥ 12.5 g/dL / ≥ 38% females
* ≥ 13.0 g/dL / ≥ 39% males
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Criteria for Allogenic Donor Selection - Weight
* minimum 110 lbs / 50 kg
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Donor Deferral - 1 year
* Possible exposure to hepatitis, HIV or malaria
* Hepatitis B Immune Globulin
* Possible exposure to hepatitis, HIV and malaria
* Recipient of blood/blood products
* Tattoo - unless at state regulated facility
* Is living with or having sexual contact with a person positive for HBsAg or HBV NAT; is symptomatic for hepatitis C of any other viral hepatitis
* Mucous membrane exposure to blood
* Skin penetration with instruments contaminated with blood/body fluid
* Sexual contact with individual symptomatic for any viral hepatitis, confirmed + for HBsAg / HIV or in high risk category
* From completion of therapy for syphillis or gonorrhea or reactive STS
* Traveled to endemic area for malaria
* 72 hours in a correctional institution
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Donor Deferral - 3 years
  • Possible exposure to malaria

  • Asymptomatic during the time

    • Visitor/immigrant from area endemic for malaria

    • Previously diagnosed with malaria

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Donor Deferral - Indefinite/Permanent
  • Definite disease or habits strongly associated with bloodborne pathogens

  • Viral diseases:

    • Viral hepatitis after age 11

    • Confirmed positive test for HBsAg or positive HBV NAT result

    • Repeatedly reactive test for anti-HBc or anti-HTLV

    • Donated only unit to recipient who developed post transfusion hepatitis, HIV or HTLV

    • Present/Past infection of HCV, HTLV, HIV or T. cruzi

    • Evidence of parenteral drug use

  • Other Diseases:

    • Family history of CJD or risk of vCJD

    • History of babesiosis

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Expiration with anticoagulation and additives - ACD/CPD/CPD2
21 days
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Expiration with anticoagulation and additives - CPDA-1
35 days
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Expiration with anticoagulation and additives - Additives
42 days
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Rejuvenating solutions
* Restores 2,3-DPG and ATP
* Can freeze unit or, if used in 24 hours, can be stored at 1-6C (must wash cells before transfusion to remove solution)
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Autologous Donations
  • Donations for self; no age limit

  • Hct ≥ 33%; Hgb ≥ 11 g/dL

  • No bacteremia

    • Collection > 72 hours prior to surgery or transfusion

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Autologous Donations - Autologous units
* segregate from allogeneic units, only used for original donor
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Autologous Donations - Low volume collections
  • Use regular blood bags; volume drawn < 10.5 mL/kg body weight for minimum weight (450 + 45 mL plus testing samples)

  • If 300-404 mL drawn, label as “Red Blood Cells Low Volume” (other components may not be made from these units)

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Hemapheresis/Apheresis Collection
  • Donor criteria same as for whole blood

  • Limits number of donor exposures

    • Apheresis instruments can selectively remove needed component(s) and return components not needed

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Hemapheresis/Apheresis Collection - Cytapheresis (Platelets, granulocytes, and leukocytes)
  • Donations at least 2 days apart and no more than 2 in any 7 day period

  • If RBCs collected and cannot be returned, must wait 8 weeks

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Hemapheresis/Apheresis Collection - Cytapheresis (RBCs)
* Deferral is 16 weeks for 2 unit RBC apheresis
* A two unit RBC donation must not decrease donor’s hematocrit below 30% or hemoglobin below 10 g/dL
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Cytapheresis
Separation and Collection of: Cells
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Plasmapheresis
Separation and Collection of: Plasma
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Plateletpheresis
Separation and Collection of: Platelets
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Leuka/Granulocytapheresis
Separation and Collection of: Leukocytes/Granulocytes
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Hemapheresis/Apheresis Collection - Cytapheresis (Hematopoetic progenitor cells)
* Can be collected from peripheral circulation
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Hemapheresis/Apheresis Collection - Therapeutic
* Removal of a blood component, e.g., platelets, leukocytes, RBCs
* Removal of blood substance, e.g., protein, immune complexes in plasma and high molecular weight particles
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Hematopoietic Progenitor and Stem Cells
  • Used to reconstitute bone marrow post chemotherapy/irradiation or to replace abnormal marrow cells with normal marrow cells (congenital immune deficiencies, anemias, malignant disorders of bone marrow, red cell disorders, etc.)

  • Cells obtained from bone marrow, umbilical cord blood and peripheral blood (apheresis)

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Hematopoietic Progenitor and Stem Cells - Allogeneic marrow
* HLA-identical match lowers risk of GVHD; ABO compatibility not required
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Tests Performed on Donor Blood - ABO
* Resolve discrepancies
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Tests Performed on Donor Blood - Rh
* Weak D determination on D negatives
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Tests Performed on Donor Blood - Antibody screens
  • Clinically significant antibodies

  • FFP cannot be prepared from these units; platelets and cryoprecipitate can (contain minimum plasma volume)

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Tests Performed on Donor Blood - Serologic tests
* Examples:
* RPR for syphilis
* Antibody to T. cruzi
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Tests Performed on Donor Blood - Viral Diseases
  • HBsAg

  • Anti-HBc

  • Anti-HCV

  • Anti-HIV 1/2

  • Anti-HTLV I/II

  • NAT Testing for:

    • HIV 1- RNA

    • HCV RNA

    • West Nile RNA

    • HBV DNA

    • Zika RNA

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Components/Transfusion Practice - Whole Blood
* Used in cases of severe shock (blood loss ≥ 25% blood volume) needing RBCs for oxygen and plasma for volume
* Rarely used due to increased use and availability of components (except for autologous transfusions)
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Components/Transfusion Practice - Red Blood Cells (Packed Cells)
  • Red cells with plasma removed

  • Provides same oxygen carrying capacity as whole blood with less volume

  • < 80% Hct (indicates sufficient plasma removal); 55-65% Hct if additive solution used

  • 1 unit raises hemoglobin (Hgb) 1 g/dL or hematocrit (Hct) 3%

  • Changes in plasma during storage (1-6 C)

    • INCREASED: NH4 and K+

    • DECREASED: pH and Na+

    • Unit of blood cannot be returned and reissued if > 10C or if seal disturbed

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Components/Transfusion Practice - Washed Red Cell
  • Plasma removed by successive saline washes (automated instrument)

  • Primarily used to prevent allergic response to plasma proteins and anaphylactic shock in IgA-deficient patients with anti-IgA (IgA is in normal plasma); removes anti-HPA-1a from maternal blood used to neonatal transfusions; removes complement

    • Expires 24 hours after seal of original unit broken

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Components/Transfusion Practice - Apheresis Red Blood Cells
  • Hemoglobin should be ≥ 60 g in individual units or > 50 g in 95% of units tested

  • Leukoreduced - < 5x10^6 leukocytes / unit with final hgb of ≥ 51g in individual units or > 42.5 g in 95% of units tested

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Components/Transfusion Practice - Leukocyte Reduced Red Cells
  • 85% of red cells retained

  • Final WBC count < 5 x 10^6 to prevent febrile nonhemolytic reactions, HLA alloimmunization, and the transmission of CMV

  • Preparation by filtration during processing or at bedside

  • Used primarily for patients with repeated febrile nonhemolytic (FNH) reactions; usually due to presence of cytokines released from white cells or alloimmunization to HLA or leukocyte antigens

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Components/Transfusion Practice - Frozen Cells / Deglycerolyzed cells
  • Cells protected from ultra low temperatures by cryoprotective agent (40% glycerol)

  • Used for storage of autologous units and “rare” units; expires in 10 years

  • Must be thawed at 37C, glycerol removed prior to transfusion, and ≥ 80% RBC recovery

  • Stored at ≤ - 65C; 1-6C for 24 hours after deglycerolizing (open system)

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Components/Transfusion Practice - Fresh Frozen Plasma (FFP)
  • Prepared by separating cells and plasma by centrifugation and freezing plasma within 8 hours of collection

  • Expires 1 year from date of collection when stored at ≤ -18C or 7 years stored at ≤ -65C

  • Once thawed (between 30-37C), expires in 24 hours, if stored at 1-6C

  • Must be ABO compatible with recipient cells; not necessarily ABO identical

  • Used for multiple coagulation deficiencies, Factor XI deficiency, and other congenital deficiencies for which no concentrate is available

  • Collection is from males or never pregnant females to prevent TRALI

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Components/Transfusion Practice - Plasma Frozen Within 24 Hours of Phlebotomy (PF24)
  • Plasma frozen to ≤ -18C within 24 hours of collection from whole blood or apheresis

  • Apheresis plasma kept at 1-6C for 24 hours and then frozen at ≤ -18C

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Components/Transfusion Practice - Cryoprecipitate (Cryoprecipitated Antihemophilic Factor)
  • When FFP frozen within 8 hours of whole blood collection is thawed at 1-6C, a cold insoluble portion of plasma forms - CRYO

  • CRYO is separated from thawed FFP and refrozen within one hour

  • Must contain ≥ 150 mg of fibrinogen and ≥ 80 IU/bag of Factor VIII

  • Also contains vWF, ristocetin cofactor activity, Factor XIII and fibronectin

  • Store at ≤ -18C for 1 year from date of phlebotomy; room temperature after thawing

  • Transfuse within 6 hours of thawing; 4 hours after pooling in an open system; 6 hours after pooling in a closed system

  • Most commonly used to replace fibrinogen loss due to DIC and/or massive bleeding or for dysfibrinogenemia with active bleeding

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Factor Concentrates/Recombinant Products - Recombinant (most common) or virally inactivated Factor VII concentrated
* Treat moderate to __severe__ Hemophilia A and von Willebrand disease (use Factor VIII labeled as containing vWF)
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Factor Concentrates/Recombinant Products - Prothrombin complex concentrates (virally inactivated), recombinant, or virally inactivated Factor IX concentrate
* Treat Hemophilia B
* Prothombin complex concentrates contain vitamin-K dependent factors: II, VII, IX, and X; may increase risk of thrombosis
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Factor Concentrates/Recombinant Products - Recombinant activated Factor VIIa
* Treat Hemophilia A and B in patients with inhibitor antibodies (bypass Factor VIII in cascade) or those with Factor VII deficiency)
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Factor Concentrates/Recombinant Products - DDAVP
* Used for __mild__ hemophilia A and type 1 vWD; increases circulating Factor VIII and vWF
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Components/Transfusion Practice - Platelets/Plateletpheresis
* Prepared from whole blood (stored at 20-24C prior to processing) or apheresis; whole blood processing listed below
* Light spin (to remove red cells) followed by heavy centrifugation (to spin down platelets and white cells)
* Express supernatant plasma into another bag for freezing (FFP)
* Remaining plasma, platelets and white cells = platelets
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Components/Transfusion Practice - Platelets/Plateletpheresis
* Conditions:
* For severe thrombocytopenia and platelet dysfunction
* Prophylactic use of platelets when platelet count is low is controversial (threshold depends on patient’s risk of bleeding)
* Contraindicated in TTP, ITP, and heparin-induced thrombocytopenia (HIT)
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Components/Transfusion Practice - Platelets/Plateletpheresis
* Platelets from donors who are within 48 hours of taking drugs that impair platelet function (e.g., aspirin) should not be used as a “single source” (apheresis product or single unit for a newborn)
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Components/Transfusion Practice - Platelets/Plateletpheresis (Platelet refractoriness)
* The lack of expected response is usually due to antibodies to HLA class I antigens or platelet specific antigens
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Components/Transfusion Practice - Platelets/Plateletpheresis (Transfusion)
* In average sized adult
* 1 unit of platelets raises platelet count 5,000 - 10,000 uL
* 1 apheresis unit raises the platelet count 20,000-60,000 uL
* Transfuse within 4 hours after pooling in an open system
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Components/Transfusion Practice - Platelets/Plateletpheresis
  • pH ≥ 6.2 at end of storage; stored in volume of plasma necessary to maintain pH, usually 40-70 mL for whole blood derived platelets

  • ≥ 5.5 x 10^10 platelets/unit in 75% of units tested or ≥ 3 x 10^11 platelets/plateletpheresis in 90% of units tested

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Components/Transfusion Practice - Platelets/Plateletpheresis (Whole blood derived leukoreduced platelets)
* < 8.3 x 10^5 leukocytes
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Components/Transfusion Practice - Platelets/Plateletpheresis (Leukoreduced pooled platelets or plateletpheresis product)
* < 5 x 10^6 leukocytes in 95% units tested
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Components/Transfusion Practice - Platelets/Plateletpheresis
  • Stored with continuous gentle agitation at 20-24C (room temp)

  • Outdate is 5 days

  • Must have method to detect and limit bacterial contamination

  • May have some residual RBCs; consider administering RhIg to RhD neg women of childbearing age who have received D pos platelets

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Components/Transfusion Practice - Granulocyte Pheresis
  • Obtained by apheresis

  • Granulocyte colony-stimulating factor (G-CSF) increases yield

  • Used for neutropenic patients with documented gram negative sepsis who have not responded to antibiotics

  • Can transmit CMV, induce HLA immunization, and cause GVHD, if not irradiated

  • Stored without agitation at 20-24C for up to 24 hours, but should be transfused ASAP

  • Should be ABO-compatible with recipient; crossmatch if >2mL RBCs

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Components/Transfusion Practice - Irradiated Blood and Components
  • Prevents graft (donor lymphs) and vs. host disease (GVHD) (inactivates T cells)

  • For anyone at GVHD risk: fetus receiving intrauterine transfusion; donor is blood relative of recipient; donor is HLA matched; or congenital immunodeficiency

  • Minimum of 25 Gy (gray) or 2500 cGy (centigray) delivered to center of container; minimum dose of 15Gy to any point

    • RBCs expired on original outdate or 28 days after irradiation, whichever is first

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Transporting blood and components
  • Red cells kept at 1-10C

  • Platelets and granulocytes kept at 20-24C

  • Frozen components kept frozen

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Expiration of blood/components when seal is broken (packing cells or pooling components)
  • Products stored at 1-6C = 24 hours

  • Products stored at 20-24C = 4 hours

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Pooling components
  • If red cells visible in pooled product, patient plasma antibodies should be compatible with those red cells

  • Expiration of pooled components

    • Platelets - 4 hours (open system)

    • Cryoprecipitate - 4 hours (open system); 6 hours (closed system)

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QC - RBCs
* Hct 80% (Maximum)
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QC storage - RBCs
  • 1-6°C (closed system)

  • 21 days (ACD, CPD, CP2D)

  • 35 days (CPDA-1)

  • 42 days (Additive)

  • 1-6°C (open system), 24 hours

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QC - Leukocyte Reduced Cells
* < 5 x 10^6 leukocytes in 95% units tested
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QC storage - Leukocyte Reduced Cells
* 1-6°C, same as Red Cells
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QC - Apheresis RBCs
* > 60 g Hgb (individual units); must have > 50 g hgb in 95% units tested
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QC storage - Apheresis RBCs
  • 1-6°C

  • CPDA-1: 35 days

  • Additive system: 42 days

  • Open system: 24 hours

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QC - Apheresis RBCs - Leukocyte Reduced
* > 51 g hgb (individual units) or > 42.5 g hgb in 95% units tested
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QC storage - Apheresis RBCs - Leukocyte Reduced
  • 1-6°C

  • CPDA-1: 35 days

  • Additive system: 42 days

  • Open system: 24 hours

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QC - Frozen Red Cells
  • ≥ 80% of Original Red Cells

  • Adequate Removal of Cryoprotective Agent (glycerol)

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QC Storage - Frozen Red Cells
  • 10 years, -65°C or Colder (40% Glycerol)

  • -120°C (20% Glycerol)

  • 24 hours once deglycerolized (open system)

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QC - Fresh Frozen Plasma PF24
  • Frozen to ≤ -18°C within 8 hours

  • Frozen to ≤ -18°C within 24 hours

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QC storage - Fresh Frozen Plasma PF24
  • 12 months, ≤ -18°C

  • 7 years ≤ -65°C or Colder

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QC - Crytoprecipitated AHF
*  ≥ 80 IU/Unit Factor VIII; 150 mg Fibrinogen
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QC storage - Crytoprecipitated AHF
* 12 months, ≤ -18°C
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QC - Platelets, Single Donor (Closed System)
* ≥ 5.5 x 10^10 plt/unit in 90% of Units Tested; pH 6.2 or Greater in 90% Units Tested at Maximum Storage Time
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QC storage - Platelets, Single Donor (Closed System)
* 5 days, 20-24°C with Constant Agitation
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QC - Platelets, Pooled (Open System)
* ≥ 5.5 x 10^10 plt/unit in 90% of Units Tested; pH 6.2 or Greater in 90% Units Tested at Maximum Storage Time
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QC storage - Platelets, Pooled (Open System)
* 4 hours, 20-24°C with Constant Agitation
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QC - Platelets, Leukocyte-Reduced
  • ≥ 5.5 x 10^10 Platelets in 75% of Units Tested

  • < 8.3 x 10^5 Leukocytes in 95% of Units Tested

  • < 5 x 10^6 in Pooled Platelets

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QC storage - Platelets, Leukocyte-Reduced
* 5 days, 20-24°C with Constant Agitation
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QC - Apheresis Platelets / leukoreduced
  • ≥ 3.0 x 10^11 plt/unit in 90% of Units Tested

  • pH 6.2 or Greater at Maximum Storage Time, < 5 x 10^6 leukocytes in 95% units tested

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QC storage - Apheresis Platelets / leukoreduced
  • 5 days, 20-24°C with Constant Agitation

  • 24 Hours (Open System)

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QC - Apheresis Granulocytes
* ≥ 1.0 x 10^10 Granulocytes in 75% of Units tested
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QC storage - Apheresis Granulocytes
* 24 Hours, 20-24°C
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An O negative patient needs 6 units of platelets. Only O positive platelets are available. What needs to be considered in this case?
The platelets once pooled have an expiration of 4 hours. Since the patient is O negative, the physician may want to consider RhIG. This will depend on the patient (Female of childbearing age? Elderly? Diagnosis? Probability of getting more platelets, etc.)
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A unit of red cells was issued to the OR at 2:00 a.m. It was returned at 2:45 am unentered. It was kept at 2C in a blood bank monitored cooler. Can this unit be accepted for reissue to another patient?
Yes, a unit of RBCs can be reissued if it was not entered and was maintained between 1-10C during storage and transportation. There should be at least 1 segment still attached to the donor bag.
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A patient with a mild case of vonWillebrand’s disease suffered minor cuts and bruises in a car accident. What should the physician consider as the treatment of choice in this situation?
Patients with mild vonWillebrand-disease can usually be treated with DDAVP. This drug causes release of vWF from endothelial cells causing the plasma level of vWF to increase. More serious cases usually require Factor VIII concentrates (some are available with vWF) or cryoprecipitate
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What is the component of choice for a patient in DIC with a low fibrinogen level?
Cryoprecipitate is used because of the high concentration of fibrinogen. FFP can be used to restore the depleted coagulation factors, but the volume needed to restore fibrinogen is usually too large.
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A patient was diagnosed as Hemophilia A with inhibitors. Why would transfusion of recombinant Factor VIIa be better than transfusion of Factor VIII?
The Factor VIIa would bypass the Factor VIII and activate Factor X in the coagulation cascade to achieve hemostasis. If Factor VIII were used, it would be neutralized by the inhibitors (antibodies to Factor VIII) and the patient would still be bleeding
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What is the correct pH that must be maintained for platelets through the end of storage?
≥ 6.2
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What is the maximum number of leukocytes that are allowed in a Red Cell Unit for the unit to be considered Leukoreduced?
5 x 10^6 leukocytes/unit
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Why and when should RhIG be considered when transufusing platelets?
Red cells that remain in the unit may carry the D antigen (platelets do not). If the apheresis donor is D positive and the recipient is D negative or if there are some D positive donors in the pool of platelets, the residual RBCs can stimulate an immune response. If the recipient is a female and of childbearing age, it may be prudent to provide RhIG in order to prevent alloimmunization
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ABO antigens
* Defined by immunodominant sugar on cell surface
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ABO antigens - H precursor
* H Substance
* A = A and H
* B = B and H
* O = H
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ABO antigens - hh precursor
* Precursor Substance = ABO genes = Oh (Bombay)
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ABO antigens - Subgroups of A (A1 and A2)
  • Principal subgroups of A

  • Serological difference based on reactivity with anti-A1 (Dolichos biflorus* or human anti-A1). (*lectin - plant or seed extract diluted to agglutinate specific human blood group antigens)

    • A1 cells are agglutinated

    • A2 cells are NOT agglutinated

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A1 cell
POSITIVE Anti-A1
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