ASCP BOC Specialist in Blood Banking (SBB) Examination Practice Test
Specialist blood banking practice centers on transfusion medicine and immunohematology: identifying blood group antigens and antibodies, resolving ABO discrepancies, and selecting compatible blood components. Questions in this practice bank also touch on transfusion reactions, component modifications, donor screening, and decisions that protect patients while antibody investigations are underway.
Exam overview
About the ASCP BOC Specialist in Blood Banking (SBB) Examination Exam
The work requires interpreting serologic reactions in context, distinguishing antibody classes, and choosing follow-up tests that clarify red-cell typing or antibody specificity. Pretransfusion decisions include assessing specimen validity, managing unresolved antibodies, and selecting components suited to a patient’s clinical risks, such as severe IgA deficiency. Transfusion-service judgment also involves recognizing acute reaction signs, stopping an implicated transfusion, and initiating the appropriate investigation. Component knowledge connects preparation and modification methods with their intended effects, while donor testing requires holding potentially reactive donations from release until the applicable evaluation is complete. These skills bring together bench technique, compatibility assessment, component selection, and clear risk-focused decisions.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
Which blood component is the preferred source of ADAMTS13 for replacement in a patient with thrombotic thrombocytopenic purpura when plasma replacement is indicated?
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Correct answer: APlasma provides ADAMTS13, the protease deficient or functionally inhibited in thrombotic thrombocytopenic purpura. Platelets are generally avoided unless there is a compelling bleeding indication, and cryoprecipitate is not an appropriate ADAMTS13 replacement product.
A patient with group O red cells has an unexpected reverse-grouping reaction with both A1 and B reagent cells. The reaction is abolished by treatment of the patient’s plasma with dithiothreitol (DTT). Which antibody class is most likely responsible?
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Correct answer: BDTT disrupts the disulfide bonds of pentameric IgM, typically abolishing its agglutinating activity. IgG is comparatively resistant to this treatment.
A patient develops chills, fever, and hypotension during a red cell transfusion. What is the most appropriate immediate action?
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Correct answer: AA suspected acute transfusion reaction requires stopping the transfusion promptly, maintaining venous access with compatible saline using new tubing, and assessing the patient. The transfusion service should be notified and the reaction investigated according to local procedures.
A red cell unit is labeled leukocyte-reduced. Which benefit is most directly associated with this modification?
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Correct answer: ALeukocyte reduction decreases donor leukocytes and can lower febrile nonhemolytic reactions and the risk of transmitting leukocyte-associated cytomegalovirus. It is not a substitute for irradiation when prevention of transfusion-associated graft-versus-host disease is indicated.
A patient has a newly detected red-cell alloantibody, but the antibody’s specificity is not yet established. Which general laboratory practice helps prevent an incompatible transfusion while the investigation continues?
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Correct answer: AAn unresolved antibody workup can conceal clinically significant incompatibility. The transfusion service should communicate the delay and avoid issuing units that have not been appropriately evaluated, except under an emergency release process authorized according to local policy and clinical need.
A red-cell component is issued for a patient with severe IgA deficiency and a history of anaphylactic transfusion reactions. Which product choice is most appropriate when available and clinically suitable?
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Correct answer: AWashing removes most residual plasma proteins, including IgA, and can reduce the risk of recurrent reactions in selected patients with severe IgA deficiency and prior anaphylaxis. Irradiation prevents transfusion-associated graft-versus-host disease and does not remove plasma proteins.
Which immunohematologic feature is characteristic of most antibodies in the Kell blood group system?
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Correct answer: AMany Kell antibodies are immune IgG antibodies that react at 37°C and may cause clinically significant hemolytic transfusion reactions. Kell antigens are destroyed by sulfhydryl reagents such as DTT, whereas routine proteolytic enzymes do not reliably destroy them.
How to use this practice test
Access is free. Each session presents up to 20 random questions from the 50-question SBB practice bank. Submit your answers to see results after the session, then use missed items to identify which serologic interpretations, component choices, or transfusion-service decisions need further review.
Preparation tips
- Practice resolving ABO discrepancies by matching the reaction pattern to likely causes and selecting a suitable follow-up test, such as anti-A1 lectin testing when differentiating A1 from A2 cells.
- Review how DTT treatment helps distinguish IgM-mediated reactivity from antibodies of other classes, and connect antibody characteristics with transfusion compatibility decisions.
- For suspected acute transfusion reactions, rehearse the immediate response sequence, including stopping the transfusion and promptly notifying the transfusion service.
- Compare component modifications and specialized products by clinical purpose, including leukocyte reduction, plasma replacement for ADAMTS13, and product selection for severe IgA deficiency.
- Work through scenarios involving newly detected alloantibodies, limited pretransfusion specimen validity, and reactive donor screening results; identify what must be resolved before blood or a donation is released.