Medical Laboratory Technician Exam Blood Bank and Transfusion 4

Question 1

Granulocyte transfusions should be irradiated primarily to prevent:

Accepted Answer

Transfusion-associated graft-versus-host disease

Answer

Granulocyte components contain large numbers of T lymphocytes, making irradiation essential to prevent TA-GvHD.

Question 2

A patient types as group O with anti-A and anti-B but shows a weak forward reaction with anti-A,B reagent. The most likely explanation is:

Accepted Answer

A subgroup such as Ax

Answer

Weak A subgroups (Ax, Aend) may not react with individual anti-A but can react with the cross-reacting anti-A,B reagent, revealing residual A antigen.

Question 3

When a transfusion reaction is suspected, which is the FIRST action the technologist should take?

Accepted Answer

Stop the transfusion and notify the physician

Answer

Stopping the transfusion immediately limits antigen-antibody exposure; clinical management by the physician follows simultaneously.

Question 4

Which coagulation factor is the ONLY one NOT found in cryoprecipitate?

Accepted Answer

Factor V

Answer

Cryoprecipitate is enriched in Factors VIII, XIII, fibrinogen, fibronectin, and vWF but does not contain Factor V in significant amounts.

Question 5

A patient has a positive DAT and a panreactive antibody panel. The most appropriate next step is to:

Accepted Answer

Perform an autoadsorption to remove autoantibody before alloantibody identification

Answer

Autoadsorption removes warm autoantibody from the serum, allowing underlying alloantibodies to be detected before a potentially life-saving transfusion.

Medical Laboratory Technician Exam Practice Test

Medical Laboratory Technician Exam Practice Test

Medical Laboratory Technician Exam Blood Bank and Transfusion 4