Chapter 11 - Pretransfusion Testing

1. 1. Which is not included on a properly labeled specimen? a. Two unique patient identifiers b. Date and time of draw c. Phlebotomist's initials d. Patient's home address 2. 2. How many days before a pretransfusion specimen a expires? a. 3 days b. 7 days c. 14 days d. 1 month 3. 3. How many days must a pretransfusion specimen and donor unit segments be retained post-transfusion? a. 3 days b. 7 days c. 14 days d. 1 month 4. 4. If a blood type cannot be resolved, what ABO group c should be selected for a red blood cell transfusion? a. Group A b. Group B c. Group O d. Group AB 5. 5. Which antibody specificity is not required in antibody detection tests? 1/4 d b b a. K b. Cw c. Fya d. S 6. 6. A patient has a history of anti-Jka. The antibody b screen is currently negative. Which red blood cell unit should be selected, and what type of crossmatch should be performed? a. Jk(a-) red blood cells, computer crossmatch b. Jk(a-) red blood cells, antiglobulin crossmatch c. Jk(a-) red blood cells, immediate spin crossmatch d. ABO-compatible because the antibody screen is negative 7. 7. Which is not true of rouleaux formation? a. Mimics agglutination b. Appears like a "stacking of coins" c. Can be seen in the antiglobulin test d. Can be dispersed by saline 8. 8. A patient's blood type is AB-negative, but there are a no AB-negative red blood cell units available. What donor units could be selected? a. A-negative b. O-positive c. B-positive d. All of the above 9. 9. A patient requires 15 units of thawed plasma for an apheresis procedure. The patient's blood type is 2/4 c d O-negative. What donor units could be selected? a. O-negative b. AB-positive c. A-negative d. All of the above 10. 10. The American College of Surgeons recommends b transfusion of red blood cells, thawed plasma, and platelets in what ratio for a massive transfusion? a. 2 units of red blood cells for every unit of platelets b. 1 unit of red blood cells to 1 unit of thawed plasma to 1 unit of platelets c. 1 unit of red blood cells to 3 units of thawed plasma d. It's an emergency. Give the surgeon whatever she wants 11. 11. A patient's antibody screen was positive and an e anti-c was identified. Antiglobulin crossmatches were performed with c-negative units and 1 of the 6 units was incompatible. What should be performed to resolve the incompatible crossmatch? a. Give O-negative red blood cells b. Retype the incompatible unit for the c antigen c. Perform a DAT on the incompatible unit d. Perform additional identification testing to include low-specificity antigens e. b, c, and d 3/4 12. 12. A mother, 30 weeks' pregnant, has anti-K with a c titer of 32. An intrauterine red blood cell transfusion is indicated. The donor unit selected should be all of the following except: a. O-negative b. K-negative c. Positive for sickling hemoglobin d. Irradiated 13. 13. A patient with sickle cell disease is B-positive with c a positive antibody screen. The antibody identified is anti-D, and the autocontrol is negative. What is a possible explanation? a. The patient is weak D-positive b. Autoantibody is present c. Patient possesses the partial D phenotype d. The patient has a positive DAT 4/4