Deck 7: Pretransfusion and Compatibility Testing

Question 1

All of the following are methodologies used for routine transfusion medicine testing except

A)Gel testing
B)Immunodiffusion testing
C)Solid phase testing
D)Tube/microplate testing

Answer 1

Immunodiffusion testing

Question 2

All of the following should be included in a visual inspection of a platelet unit except

A)Check for unusual particulate matter
B)Check for hemolysis
C)Check for visible clots
D)Check for Leᵃkage

Answer 2

Check for hemolysis

Question 3

Which statement is false?

A)Downtime procedures are vital in a laboratory that performs electronic crossmatches.
B)Downtime procedures encompass back entry of results once the LIS is functioning again.
C)During downtime,antiglobulin crossmatch should be performed on all specimens if recipients requiring an antiglobulin crossmatch cannot be identified.
D)During downtime,immediate spin crossmatches will be rarely performed instead of electronic crossmatches.

Answer 3

During downtime,immediate spin crossmatches will be rarely performed instead of electronic crossmatches.

Question 4

When blood components are ordered all of the following are true except

A)Name of the physician placing the order must be indicated
B)Orders should be placed to ensure sufficient time to perform complete testing
C)Requests must include the number and type of components required
D)Requests must only be made using a written request form

Question 5

In order for patients to give informed consent,they must first

A)be educated about the risks and benefits
B)be scheduled for an appointment
C)have a diagnosis
D)sign a waiver

Question 6

If a recipient is hemodynamically unstable most experts would agree that incompatible red blood cell units

A)should be washed before transfusion
B)should be withheld
C)should not be split before transfusion
D)should not be withheld

Question 7

Which of the following is not a type of additive used if antibody screening and identification is performed by tube testing?

A)Albumin
B)DTT
C)LISS
D)PEG

Question 8

In the event that a patient's ABO type cannot be determined in accordance with facility policies,group ____ cells may be issued for transfusion until the patient's ABO type has been resolved.

A)A
B)B
C)O
D)AB

Question 9

Which of the following should be performed if the current antibody screen is positive and/or the patient has a history of clinically significant antibodies?

A)Computer-assisted crossmatch (CAC)
B)Direct antiglobulin test (DAT)crossmatch
C)Immediate spin (IS)crossmatch
D)Indirect antiglobulin test (IAT)crossmatch

Question 10

Issue of uncrossmatched red blood cells is defined as

A)ABO group has not been determined
B)Antibody identification has not been completed
C)Rh type has not been determined
D)Some or all required testing has not been completed

Question 11

When performing an immediate spin crossmatch,a suggested procedure is to add one drop of 3-5% saline washed donor red blood cell suspension to ____ drop(s)of recipient plasma in a test tube.

A)one
B)two
C)three
D)four

Question 12

Another term for the electronic crossmatch is

A)computer-aided crossmatch
B)computer-assisted crossmatch
C)computer-enhanced crossmatch
D)computer-generated crossmatch

Question 13

In most situations,patients who type as Rh(D)negative should receive

A)Rh(D)-negative red blood cells
B)Rh(D)-positive red blood cells
C)Rh(E)-negative red blood cells
D)Rh(E)-positive red blood cells

Question 14

The ABO group of the neonate is determined only by typing red blood cells with

A)anti-A antiserum
B)anti-B antiserum
C)both anti-A and anti-B antisera
D)both anti-A and anti-O antisera

Question 15

Crossmatch is also known as

A)Compatibility testing
B)Donor cell antigen typing
C)Immediate spin phase testing
D)Patient cell antigen typing

Question 16

What is the purpose of a reflex test?

A)Detect unexpected red blood cell antibodies
B)Identify red blood cell phenotype
C)Increase sensitivity of pretransfusion testing
D)Investigate an inconclusive or unexpected result

Question 17

The majority of hemolytic transfusion reactions that occur are due to

A)errors in sample or patient identification
B)errors in written orders
C)illegible handwriting on the order
D)miscommunication of verbal orders

Question 18

Allocating can be considered a separate process or it can be considered the ___ step in the crossmatch process.

A)Critical
B)First
C)Last
D)Second

Question 19

A type and screen includes all of the following tests except

A)ABO group
B)Antibody screen
C)Patient cell phenotype
D)Rh(D)type

Question 20

In facilities that use the electronic crossmatch,the C:T (crossmatched:transfused)ratio should approach

A)1:1
B)3:1
C)5:1
D)10:1