Blood Banking Assessment Exam 2026/2027 – AABB & ASCP
Standards – Comprehensive Immunohematology, Transfusion
Medicine & Laboratory Competency Practice Exam — 139
Questions and Answers Already Graded A+ Premium Exam
Tested And Verified
Subject Area Immunohematology, Transfusion Medicine, Laboratory Competency
Description This comprehensive practice exam assesses mastery of blood banking principles
per AABB and ASCP standards. Topics include donor screening, blood group
systems, antibody identification, transfusion reactions, component therapy,
molecular immunohematology, and quality assurance. Designed for senior
students and laboratory professionals seeking certification.
Expected Grade A+
Total Questions 139
Duration 3 hours
Learning Outcomes 1. Apply immunohematologic principles to complex serologic problems
2. Interpret laboratory data to ensure safe transfusion practices
3. Evaluate donor eligibility and component management per current regulations
Accreditation Conforms to AABB Standards for Blood Banks and Transfusion Services (32nd
edition) and ASCP Board of Certification content guidelines.
Page 1
,1. A patient with a history of multiple transfusions has a positive direct antiglobulin
test (DAT) (2+ IgG, negative C3). The eluate reacts with all panel cells tested. Which
of the following is the most likely cause?
A. Autoantibody with underlying alloantibody
B. Delayed hemolytic transfusion reaction due to anti-Jka
C. Drug-induced hemolytic anemia
D. Passively acquired anti-A from platelet transfusion
Answer: A. Autoantibody with underlying alloantibody
A positive DAT with IgG and panreactive eluate is typical of warm autoantibody. The
presence of underlying alloantibody must be ruled out by adsorption studies.
Drug-induced antibodies often require drug for reactivity; delayed reactions typically
show a specific alloantibody.
2. A donor's red cells type as group O, D+ with a positive antibody screen. The
antibody is identified as anti-K. The donor's plasma is used for transfusion. Which
component is most appropriate for a group O, D+ recipient with anti-K?
A. Fresh frozen plasma from the same donor
B. K-negative red cells from another donor
C. Cryoprecipitate from the same donor
D. Platelets from the same donor
Answer: B. K-negative red cells from another donor
The recipient has anti-K, so K-negative red cells are required to avoid hemolysis. The
donor's plasma contains anti-K, but plasma transfusion is not indicated for red cell
replacement. Cryoprecipitate and platelets from this donor would also contain anti-K,
posing risk.
Page 2
,3. A patient's serum reacts 2+ with all panel cells at immediate spin, 1+ at 37°C, and
2+ at AHG. The autocontrol is negative. Which of the following is most consistent
with these findings?
A. Cold autoantibody with high thermal amplitude
B. Alloantibody to a high-frequency antigen
C. Rouleaux due to hyperproteinemia
D. Antibody to a low-frequency antigen
Answer: B. Alloantibody to a high-frequency antigen
A panreactive pattern with negative autocontrol suggests an alloantibody to a
high-frequency antigen (e.g., anti-k, anti-Jk3). Cold autoantibodies typically show
autocontrol reactivity. Rouleaux is not antibody-mediated and resolves with saline
replacement. Low-frequency antigens would not react with all cells.
4. Which of the following best explains why group O whole blood is not routinely
transfused to non-group O patients in massive transfusion protocols?
A. Anti-A,B in group O plasma can cause hemolysis of recipient red cells
B. Group O red cells have higher oxygen affinity
C. Group O red cells lack D antigen
D. Group O plasma contains anti-D that sensitizes recipient red cells
Answer: A. Anti-A,B in group O plasma can cause hemolysis of recipient red cells
Group O plasma contains high titers of anti-A,B, which can hemolyze A or B red cells
of non-group O recipients. While low-titer group O whole blood may be used, standard
whole blood is avoided. Group O red cells are D+ or D-; D type is unrelated. Anti-D is
not present unless the donor is immunized.
Page 3
, 5. A patient with sickle cell disease requires red cell exchange. The patient has
anti-C, anti-E, and anti-K. Which of the following is the most appropriate red cell
product?
A. Phenotypically matched for C, E, and K; HbS negative
B. Crossmatch-compatible units regardless of phenotype
C. Group O, D-negative, HbS negative units
D. Leukoreduced, irradiated units only
Answer: A. Phenotypically matched for C, E, and K; HbS negative
Patients with sickle cell disease and multiple antibodies benefit from prophylactic
antigen matching to prevent alloimmunization. HbS-negative units are required to
avoid sickling. Crossmatch compatibility alone is insufficient. While leukoreduction
and irradiation may be indicated, the key is antigen matching.
6. A 30-year-old female with no transfusion history is admitted for elective surgery.
Her pretransfusion sample shows a positive antibody screen. The panel reveals
anti-D. Which of the following is the most likely explanation?
A. Naturally occurring anti-D from pregnancy
B. Previous administration of Rh immune globulin
C. Passive transfer from platelet transfusion
D. Autoanti-D from autoimmune hemolytic anemia
Answer: B. Previous administration of Rh immune globulin
Anti-D in a female of childbearing age without transfusion history is most likely due to
Rh immune globulin (RhIG) administration, often given during pregnancy or after
miscarriage. Naturally occurring anti-D is rare. Passive transfer from platelets is
possible but less common. Autoanti-D is exceedingly rare.
Page 4
Standards – Comprehensive Immunohematology, Transfusion
Medicine & Laboratory Competency Practice Exam — 139
Questions and Answers Already Graded A+ Premium Exam
Tested And Verified
Subject Area Immunohematology, Transfusion Medicine, Laboratory Competency
Description This comprehensive practice exam assesses mastery of blood banking principles
per AABB and ASCP standards. Topics include donor screening, blood group
systems, antibody identification, transfusion reactions, component therapy,
molecular immunohematology, and quality assurance. Designed for senior
students and laboratory professionals seeking certification.
Expected Grade A+
Total Questions 139
Duration 3 hours
Learning Outcomes 1. Apply immunohematologic principles to complex serologic problems
2. Interpret laboratory data to ensure safe transfusion practices
3. Evaluate donor eligibility and component management per current regulations
Accreditation Conforms to AABB Standards for Blood Banks and Transfusion Services (32nd
edition) and ASCP Board of Certification content guidelines.
Page 1
,1. A patient with a history of multiple transfusions has a positive direct antiglobulin
test (DAT) (2+ IgG, negative C3). The eluate reacts with all panel cells tested. Which
of the following is the most likely cause?
A. Autoantibody with underlying alloantibody
B. Delayed hemolytic transfusion reaction due to anti-Jka
C. Drug-induced hemolytic anemia
D. Passively acquired anti-A from platelet transfusion
Answer: A. Autoantibody with underlying alloantibody
A positive DAT with IgG and panreactive eluate is typical of warm autoantibody. The
presence of underlying alloantibody must be ruled out by adsorption studies.
Drug-induced antibodies often require drug for reactivity; delayed reactions typically
show a specific alloantibody.
2. A donor's red cells type as group O, D+ with a positive antibody screen. The
antibody is identified as anti-K. The donor's plasma is used for transfusion. Which
component is most appropriate for a group O, D+ recipient with anti-K?
A. Fresh frozen plasma from the same donor
B. K-negative red cells from another donor
C. Cryoprecipitate from the same donor
D. Platelets from the same donor
Answer: B. K-negative red cells from another donor
The recipient has anti-K, so K-negative red cells are required to avoid hemolysis. The
donor's plasma contains anti-K, but plasma transfusion is not indicated for red cell
replacement. Cryoprecipitate and platelets from this donor would also contain anti-K,
posing risk.
Page 2
,3. A patient's serum reacts 2+ with all panel cells at immediate spin, 1+ at 37°C, and
2+ at AHG. The autocontrol is negative. Which of the following is most consistent
with these findings?
A. Cold autoantibody with high thermal amplitude
B. Alloantibody to a high-frequency antigen
C. Rouleaux due to hyperproteinemia
D. Antibody to a low-frequency antigen
Answer: B. Alloantibody to a high-frequency antigen
A panreactive pattern with negative autocontrol suggests an alloantibody to a
high-frequency antigen (e.g., anti-k, anti-Jk3). Cold autoantibodies typically show
autocontrol reactivity. Rouleaux is not antibody-mediated and resolves with saline
replacement. Low-frequency antigens would not react with all cells.
4. Which of the following best explains why group O whole blood is not routinely
transfused to non-group O patients in massive transfusion protocols?
A. Anti-A,B in group O plasma can cause hemolysis of recipient red cells
B. Group O red cells have higher oxygen affinity
C. Group O red cells lack D antigen
D. Group O plasma contains anti-D that sensitizes recipient red cells
Answer: A. Anti-A,B in group O plasma can cause hemolysis of recipient red cells
Group O plasma contains high titers of anti-A,B, which can hemolyze A or B red cells
of non-group O recipients. While low-titer group O whole blood may be used, standard
whole blood is avoided. Group O red cells are D+ or D-; D type is unrelated. Anti-D is
not present unless the donor is immunized.
Page 3
, 5. A patient with sickle cell disease requires red cell exchange. The patient has
anti-C, anti-E, and anti-K. Which of the following is the most appropriate red cell
product?
A. Phenotypically matched for C, E, and K; HbS negative
B. Crossmatch-compatible units regardless of phenotype
C. Group O, D-negative, HbS negative units
D. Leukoreduced, irradiated units only
Answer: A. Phenotypically matched for C, E, and K; HbS negative
Patients with sickle cell disease and multiple antibodies benefit from prophylactic
antigen matching to prevent alloimmunization. HbS-negative units are required to
avoid sickling. Crossmatch compatibility alone is insufficient. While leukoreduction
and irradiation may be indicated, the key is antigen matching.
6. A 30-year-old female with no transfusion history is admitted for elective surgery.
Her pretransfusion sample shows a positive antibody screen. The panel reveals
anti-D. Which of the following is the most likely explanation?
A. Naturally occurring anti-D from pregnancy
B. Previous administration of Rh immune globulin
C. Passive transfer from platelet transfusion
D. Autoanti-D from autoimmune hemolytic anemia
Answer: B. Previous administration of Rh immune globulin
Anti-D in a female of childbearing age without transfusion history is most likely due to
Rh immune globulin (RhIG) administration, often given during pregnancy or after
miscarriage. Naturally occurring anti-D is rare. Passive transfer from platelets is
possible but less common. Autoanti-D is exceedingly rare.
Page 4
