Question 1

What is an abbreviated crossmatch?

Accepted Answer

A)   A minor crossmatch
B)   A type and screen plus an immediate spin crossmatch
C)   A type and screen plus a minor crossmatch
D)   A type and screen plus an immediate spin crossmatch using pooled screening cells

Question 2

The ABO dipstick test is based on what principle?

Accepted Answer

A)   Dot immunobinding assays
B)   Dry plate methodology
C)   Galvanic biosensors
D)   Gel test

Question 3

If donor cells were coated with antibody resulting in a positive DAT, what phase of the major crossmatch would generally react?

Accepted Answer

A)   IS
B)   37
C)   AHG
D)   None of the above

Question 4

What testing should be performed after blood has been issued on emergency release?

Accepted Answer

A)   A 3-cell screen IS
B)   Set up panel to quickly identify alloantibodies
C)   Nothing, the blood has already been issued
D)   Continue the crossmatch; report antibodies or incompatibilities

Question 5

In an intrauterine transfusion, whose serum is used for compatibility testing?

Accepted Answer

A)   Infant's
B)   Mother's
C)   Father's
D)   None of the above

Question 6

What criterion governs the use of the electronic crossmatch?

Accepted Answer

A)   Patient's ABO group must have been determined on two separate occasions
B)   Patient's antibody screen must have been done on two separate occasions
C)   Patient's DAT must have been done on two separate occasions
D)   Patient's Rh group must have been done on two separate occasions

Question 7

How can the ABO and Rh of the fetus be determined in utero?

Accepted Answer

A)   Amniocentesis
B)   Chorionic villus sampling
C)   Percutaneous umbilical cord sampling
D)   All of the above

Question 8

What is the primary objective of the major crossmatch?

Accepted Answer

A)   To reveal the phenotype of the donor unit
B)   To detect the presence of antibody in the donor's serum
C)   To detect the presence of antibody in the recipient's serum
D)   None of the above.

Question 9

The transfusion nurse calls the blood bank 5 minutes after a unit of packed cells were issued to say that the unit is not needed at this time. It is important for the nurse to bring the unit back immediately so that the temperature of the unit does not exceed:

Accepted Answer

A)   4°C.
B)   10°C.
C)   22°C.
D)   37°C.

Question 10

What anticoagulant is used to eliminate false-negative reactivity caused by cold autoantibodies and rouleaux?

Accepted Answer

A)   Heparin
B)   Sodium citrate
C)   EDTA
D)   All of the above

Question 11

Given the following results, what is the probable cause of a positive reaction in the major crossmatch? IS = 0 37?0°C = 0 AHG = 2+ CC = ND Auto-control was negative

Accepted Answer

A)   Alloantibody in patient serum reacting with antigen on donor cells
B)   Incorrect ABO grouping of patient or donor
C)   Autoantibody in patient serum reacting with antigen on donor cells
D)   Rouleaux

Question 12

A type and screen is done on a 49-year-old woman who is scheduled for a hysterectomy in 1 week. Her blood type is A-positive, and her antibody screen was positive. What must be done before her surgery date?

Accepted Answer

A)   Identify antibody
B)   Identify antibody and phenotype units
C)   Phenotype the patient
D)   Identify antibody and phenotype platelets

Question 13

What is the optimal time interval for compatibility testing if the patient has been transfused in the past 3 months?

Accepted Answer

A)   5 days
B)   Less than 72 hours after collection
C)   Less than 24 hours after collection
D)   2 weeks

Question 14

A male patient of average size has a hemoglobin count of 8.1 g/dl. The surgeon wants a hemoglobin count of 10 g/dl before doing surgery. How many units of RBCs need to be given before the surgeon will accept the patient into surgery?

Accepted Answer

A)   1
B)   2
C)   3
D)   4

Question 15

A patient with anti-K and anti-Jka needs two units of RBCs for surgery. How many group-specific units would need to be screened to find two that are compatible?

Accepted Answer

A)   6
B)   10
C)   20
D)   36

Question 16

Which phlebotomy site is unacceptable for compatibility testing?

Accepted Answer

A)   Vein above the intravenous line
B)   Antecubital fossa
C)   Vein below an intravenous line
D)   Vein in the hand

Question 17

Blood transfused to infants (less than 4 months old)  must be less than_____  days old.

Accepted Answer

A)   5
B)   7
C)   10
D)   6

Question 18

Mixing patient serum and donor red blood cells together and observing for direct cell lysis or agglutination is known as:

Accepted Answer

A)   the Donath-Landsteiner test.
B)   a minor crossmatch.
C)   a major crossmatch.
D)   an autohemolysis test.

Question 19

In what phase of reactivity is rouleaux usually found?

Accepted Answer

A)   IS
B)   37°C
C)   AHG
D)   None of the above

Question 20

A 39-year-old male is hemorrhaging severely. He is AB Rh-negative. Eight units of blood are required STAT. Of the following types available in the blood bank, which is most preferable for crossmatch?

Accepted Answer

A)   AB, Rh-positive
B)   A, Rh-negative
C)   A, Rh-positive
D)   O, Rh-negative

Exam 10: Pre-Transfusion Testing

What is an abbreviated crossmatch?

Correct AnswerverifiedShow Answer

If donor cells were coated with antibody resulting in a positive DAT, what phase of the major crossmatch would generally react?

Correct AnswerverifiedShow Answer

A patient with anti-K and anti-Jka needs two units of RBCs for surgery. How many group-specific units would need to be screened to find two that are compatible?

Correct AnswerverifiedShow Answer

In an intrauterine transfusion, whose serum is used for compatibility testing?

Correct AnswerverifiedShow Answer

The ABO dipstick test is based on what principle?

Correct AnswerverifiedShow Answer

Which phlebotomy site is unacceptable for compatibility testing?

Correct AnswerverifiedShow Answer

What testing should be performed after blood has been issued on emergency release?

Correct AnswerverifiedShow Answer

What criterion governs the use of the electronic crossmatch?

Correct AnswerverifiedShow Answer

Given the following results, what is the probable cause of a positive reaction in the major crossmatch? IS = 0 37?0°C = 0 AHG = 2+ CC = ND Auto-control was negative

Correct AnswerverifiedShow Answer

How can the ABO and Rh of the fetus be determined in utero?

Correct AnswerverifiedShow Answer

Blood transfused to infants (less than 4 months old) must be less than_____ days old.

Correct AnswerverifiedShow Answer

A male patient of average size has a hemoglobin count of 8.1 g/dl. The surgeon wants a hemoglobin count of 10 g/dl before doing surgery. How many units of RBCs need to be given before the surgeon will accept the patient into surgery?

Correct AnswerverifiedShow Answer

A type and screen is done on a 49-year-old woman who is scheduled for a hysterectomy in 1 week. Her blood type is A-positive, and her antibody screen was positive. What must be done before her surgery date?

Correct AnswerverifiedShow Answer

In what phase of reactivity is rouleaux usually found?

Correct AnswerverifiedShow Answer

The transfusion nurse calls the blood bank 5 minutes after a unit of packed cells were issued to say that the unit is not needed at this time. It is important for the nurse to bring the unit back immediately so that the temperature of the unit does not exceed:

Correct AnswerverifiedShow Answer

Mixing patient serum and donor red blood cells together and observing for direct cell lysis or agglutination is known as:

Correct AnswerverifiedShow Answer

What anticoagulant is used to eliminate false-negative reactivity caused by cold autoantibodies and rouleaux?

Correct AnswerverifiedShow Answer

A 39-year-old male is hemorrhaging severely. He is AB Rh-negative. Eight units of blood are required STAT. Of the following types available in the blood bank, which is most preferable for crossmatch?

Correct AnswerverifiedShow Answer

What is the primary objective of the major crossmatch?

Correct AnswerverifiedShow Answer

What is the optimal time interval for compatibility testing if the patient has been transfused in the past 3 months?

Correct AnswerverifiedShow Answer

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A patient with anti-K and anti-Jk^a needs two units of RBCs for surgery. How many group-specific units would need to be screened to find two that are compatible?

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