Missouri Blood Bank Technology
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of ABO blood grouping?
A. Detect antibodies in plasma
B. Determine compatibility for organ transplant
C. Identify antigens on red blood cells
D. Measure hemoglobin levels
Answer: C. Identify antigens on red blood cells
Rationale: ABO typing identifies A and B antigens present on red
blood cell surfaces to ensure transfusion compatibility.
2. Which antibody is naturally occurring in individuals with type A blood?
A. Anti-A
B. Anti-B
C. Anti-AB
, D. No antibodies
Answer: B. Anti-B
Rationale: Type A individuals naturally produce anti-B antibodies
against the B antigen.
3. The Rh system is primarily based on which antigen?
A. D antigen
B. C antigen
C. E antigen
D. Kell antigen
Answer: A. D antigen
Rationale: The D antigen is the most immunogenic and determines
Rh-positive or Rh-negative status.
4. What reagent is used in the direct antiglobulin test (DAT)?
A. Anti-A serum
B. Anti-human globulin
C. Saline
D. Albumin
Answer: B. Anti-human globulin
Rationale: AHG detects antibodies or complement bound to red
blood cells in vivo.
5. Which phase of testing detects IgM antibodies most effectively?
A. Immediate spin
, B. 37°C incubation
C. AHG phase
D. Gel phase only
Answer: A. Immediate spin
Rationale: IgM antibodies react at room temperature and are
detected during immediate spin phase.
6. What is the main purpose of crossmatching blood?
A. Detect platelets
B. Ensure donor-recipient compatibility
C. Measure clotting time
D. Identify hemoglobin variants
Answer: B. Ensure donor-recipient compatibility
Rationale: Crossmatching confirms compatibility between donor
RBCs and recipient serum.
7. Which blood component is stored at 1–6°C?
A. Platelets
B. Fresh frozen plasma
C. Packed red blood cells
D. Cryoprecipitate
Answer: C. Packed red blood cells
Rationale: RBCs are refrigerated to preserve function and prevent
bacterial growth.
, 8. Platelets are stored at which temperature?
A. -20°C
B. 1–6°C
C. 20–24°C with agitation
D. 37°C
Answer: C. 20–24°C with agitation
Rationale: Platelets require room temperature storage with
continuous agitation for viability.
9. Which condition is most associated with transfusion of ABO-
incompatible blood?
A. Iron deficiency
B. Acute hemolytic reaction
C. Allergic urticaria
D. Febrile non-hemolytic reaction
Answer: B. Acute hemolytic reaction
Rationale: ABO incompatibility causes rapid intravascular hemolysis.
10. What does a positive indirect antiglobulin test (IAT) indicate?
A. Antibodies bound to RBCs in vivo
B. Free antibodies in serum
C. Platelet antibodies
D. Hemoglobinopathy
Answer: B. Free antibodies in serum
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of ABO blood grouping?
A. Detect antibodies in plasma
B. Determine compatibility for organ transplant
C. Identify antigens on red blood cells
D. Measure hemoglobin levels
Answer: C. Identify antigens on red blood cells
Rationale: ABO typing identifies A and B antigens present on red
blood cell surfaces to ensure transfusion compatibility.
2. Which antibody is naturally occurring in individuals with type A blood?
A. Anti-A
B. Anti-B
C. Anti-AB
, D. No antibodies
Answer: B. Anti-B
Rationale: Type A individuals naturally produce anti-B antibodies
against the B antigen.
3. The Rh system is primarily based on which antigen?
A. D antigen
B. C antigen
C. E antigen
D. Kell antigen
Answer: A. D antigen
Rationale: The D antigen is the most immunogenic and determines
Rh-positive or Rh-negative status.
4. What reagent is used in the direct antiglobulin test (DAT)?
A. Anti-A serum
B. Anti-human globulin
C. Saline
D. Albumin
Answer: B. Anti-human globulin
Rationale: AHG detects antibodies or complement bound to red
blood cells in vivo.
5. Which phase of testing detects IgM antibodies most effectively?
A. Immediate spin
, B. 37°C incubation
C. AHG phase
D. Gel phase only
Answer: A. Immediate spin
Rationale: IgM antibodies react at room temperature and are
detected during immediate spin phase.
6. What is the main purpose of crossmatching blood?
A. Detect platelets
B. Ensure donor-recipient compatibility
C. Measure clotting time
D. Identify hemoglobin variants
Answer: B. Ensure donor-recipient compatibility
Rationale: Crossmatching confirms compatibility between donor
RBCs and recipient serum.
7. Which blood component is stored at 1–6°C?
A. Platelets
B. Fresh frozen plasma
C. Packed red blood cells
D. Cryoprecipitate
Answer: C. Packed red blood cells
Rationale: RBCs are refrigerated to preserve function and prevent
bacterial growth.
, 8. Platelets are stored at which temperature?
A. -20°C
B. 1–6°C
C. 20–24°C with agitation
D. 37°C
Answer: C. 20–24°C with agitation
Rationale: Platelets require room temperature storage with
continuous agitation for viability.
9. Which condition is most associated with transfusion of ABO-
incompatible blood?
A. Iron deficiency
B. Acute hemolytic reaction
C. Allergic urticaria
D. Febrile non-hemolytic reaction
Answer: B. Acute hemolytic reaction
Rationale: ABO incompatibility causes rapid intravascular hemolysis.
10. What does a positive indirect antiglobulin test (IAT) indicate?
A. Antibodies bound to RBCs in vivo
B. Free antibodies in serum
C. Platelet antibodies
D. Hemoglobinopathy
Answer: B. Free antibodies in serum
