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Immunohematology Quiz 4

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As prep for exam 2
Michelle Rondeau
Quiz by Michelle Rondeau, updated more than 1 year ago
Michelle Rondeau
Created by Michelle Rondeau almost 11 years ago
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Resource summary

Question 1

Question
What is the purpose of Coombs control cells?
Answer
  • To ensure that AHG tests with negative results are not the false negatives
  • To ensure that washing removed all unbound antibody
  • To ensure that AHG was not omitted or inactivated
  • All of the above

Question 2

Question
What is a positive DAT?
Answer
  • In vitro sensitization of RBC with antigen
  • In vitro sensitization of RBC with antibody
  • In vivo sensitization of RBC with antibody
  • In vivo sensitization of RBC with antigen

Question 3

Question
A positive autocontrol in antibody detection procedures is usually indicative of:
Answer
  • Inadequate washing
  • Positive DAT
  • Positive IAT
  • two of the above

Question 4

Question
Why is it important to match the lot number on the panel cells?
Answer
  • The ABO group will change from lot to lot
  • Pattern of reactions will change from lot to lot
  • It is a requirement of the FDA
  • All of the above

Question 5

Question
In interpreting an antibody screen, which of the following questions might be asked to decipher the class of antibody?
Answer
  • Is the autologous control positive or negative?
  • Is hemolysis present?
  • In what phase did the reaction occur?
  • Is rouleaux present?

Question 6

Question
What is an elution?
Answer
  • a technique used to dissociate IgM antibodies from sensitized RBCs
  • a technique used to dissociate IgG antibodies from sensitized RBCs
  • a technique used to reduce the zeta potential enhancing antigen binding
  • none of the above

Question 7

Question
What is tested in an antibody screen?
Answer
  • Patient red cells are tested against group O reagent screening cells
  • Patient serum is tested against group AB reagent screening cells
  • Patient serum is tested against group O reagent screening cells
  • Patient serum is tested against group A reagent screening cells

Question 8

Question
What might a positive antibody screen and a negative autocontrol indicate?
Answer
  • An alloantibody is coating donor cells after a transfusion
  • An autoantibody has been detected
  • An alloantibody has been detected
  • Drug-induced antibody reacting with patient cells.

Question 9

Question
When might you suspect multiple antibodies in a patient's serum?
Answer
  • Pattern of reactivity not fitting a single antibody
  • Variation in phase of reactivity
  • Variation in antibody reactivity strength
  • All of the above

Question 10

Question
One drop of Coombs control cells was added to a negative antibody screen. No agglutination was observed after centrifugation. What course of action is taken?
Answer
  • Report negative result
  • Report inconclusive result
  • Repeat the test
  • Add one more drop of check cells and recentrifuge

Question 11

Question
What is the shipping temp requirement for plasma?
Answer
  • 1 to 6 degree F
  • 1 to 6 degree C
  • -18 or higher degree F
  • -18 or lower degree C

Question 12

Question
Which of the following may not be used as a patient identifier?
Answer
  • Patient's full name
  • Patients date of birth
  • Patients medical record number
  • Patients room number

Question 13

Question
Which of the following is not an enhancement media?
Answer
  • Albumin
  • Low Ionic Strength Solution (LISS)
  • Normal Saline
  • Polyethylene glycol

Question 14

Question
Additive solutions are approved for storage of red blood cells for how many days?
Answer
  • 21
  • 42
  • 35
  • 7

Question 15

Question
What is the current storage time and storage temp for platelet concentrates and apheresis platelet components?
Answer
  • 5 days at 1 to 6 degrees C
  • 5 days at 24 to 27 degrees C
  • 5 days at 20 to 24 degrees C
  • 7 days at 22 to 24 degrees C

Question 16

Question
Whole blood and RBC units are stored at what temperature?
Answer
  • 1 to 6 C
  • 20 to 24 C
  • 37 C
  • 24 to 27 C
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