Blood Bank questions for the DHA lab exam.
The Blood Bank section covers ABO and Rh grouping, antibody screening and identification, crossmatching, blood components and transfusion reactions. Candidates for the DHA lab exam are expected to resolve grouping discrepancies, select compatible components and follow safe pre-transfusion procedures from sample receipt to issue.
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892
blood bank practice questions
- 12%
- of the exam
- 8
- subtopics
- Oct 2026
- updated
Inside this topic.
The subtopics our blood bank questions cover.
- HDFN
- Transfusion Reactions
- Techniques
- ABO System
- Antibody Identification
- Rh System
- Antibodies
- Component Therapy
Key facts to remember.
High-yield blood bank points to revise before the exam.
- 1
Group O RhD-negative red cells are the universal donor red cells, while group AB plasma is the universal donor plasma.
- 2
ABO antibodies are mainly IgM and react best at room temperature, whereas most clinically significant alloantibodies, such as anti-D, are IgG and react at 37°C.
- 3
The direct antiglobulin test (DAT) detects antibody or complement already bound to red cells in vivo, as in hemolytic disease of the newborn or hemolytic transfusion reactions.
- 4
Red cells are stored at 1-6°C, while platelet concentrates are stored at 20-24°C with continuous gentle agitation, typically for up to 5 days.
- 5
Anti-D immunoglobulin is given to RhD-negative women to prevent sensitization to RhD-positive fetal red cells.
Sample questions with answers.
10 practice questions for the DHA Medical Laboratory Technologist & Technician Licensing Examination - Dubai UAE (Blood Bank). Pick an answer to see if you're right, with a full explanation.
Question 1
The correct storage temperature for platelets is:
Question 2
Which antibodies are enhanced by enzymes?
Question 3
Which antibody is commonly associated with cold agglutinin disease?
Question 4
A positive DAT may be seen in all of the following EXCEPT?
Question 5
Which blood component is used to treat hypofibrinogenemia?
Question 6
Which test is used to detect weak expression of the D antigen?
Question 7
A patient develops urticaria and itching during transfusion without fever or hypotension. The reaction is most likely:
Question 8
Which test is used to quantify fetomaternal hemorrhage?
Question 9
Which condition causes pseudoagglutination mimicking ABO discrepancy?
Question 10
Which blood group has the highest concentration of H antigen?
Other topics in this exam.
Questions, answered
Compare the forward (cell) grouping with the reverse (serum) grouping and identify which result does not fit the expected pattern. Common causes include weak or missing antibodies in newborns and elderly patients, rouleaux, cold autoantibodies and recent transfusion or stem cell transplantation. Resolve the discrepancy before issuing group-specific blood, and use group O red cells if transfusion cannot wait.
Know acute hemolytic reactions (usually ABO incompatibility), febrile non-hemolytic reactions, allergic and anaphylactic reactions, TRALI, TACO and delayed hemolytic reactions. For each, learn the typical timing, key signs and the first action, which is to stop the transfusion and keep the line open with normal saline. Be ready for questions on the laboratory investigation that follows, such as a clerical check, repeat grouping and a DAT.
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All 892 blood bank questions, with explanations and a readiness score for this topic.