Question 1

A 29-year-old female was admitted to the emergency room with severe bleeding.The blood type was tested and determined to be AB,D negative.Six units of RBCs are ordered STAT.Of the following types available in the blood bank,which would be the most preferable for crossmatch?
A)AB,D positive
B)A,D negative
C)A,D positive
D)O,D negative

Accepted Answer

Transfusion of RBCs to D-negative recipients should be D negative when possible,especially in the case of females of childbearing age.Type AB recipients can receive AB,A,and B RBCs,as well as type O;type O,especially O,D-negative blood should be reserved for emergencies when the blood type is not known and for type O,D-negative recipients.

Question 2

To what does the abbreviation "MSBOS" refer?
A)Monthly surgical blood order schedule
B)Minimum surgical blood order staffing
C)Maximum blood order schedule
D)Minimum safe blood order schedule

Accepted Answer

The maximum surgical blood order schedule outlines the typical number of blood units that should be set up for various surgical procedures.

Question 3

The use of the electronic (computer)crossmatch is restricted to recipients who:
A)are group O.
B)do not have a clinically significant antibody.
C)have had successful transfusions in the past.
D)have transfusion history that has been documented in the computer.

Accepted Answer

The electronic (computer)crossmatch may be performed only on patients who do not have or have a history of a clinically significant antibody.

Question 4

A donor unit with a positive DAT would cause reactions at what phase of the crossmatch?
A)Immediate spin
B)Antiglobulin
C)None;it would be compatible
D)All phases

Accepted Answer

The antiglobulin phase of the crossmatch would be positive because it would detect donor cells with attached IgG antibodies.

Question 5

In which of the following situations can the crossmatch test be omitted?
A)In a patient who is receiving a directed donation
B)In a patient who has received a massive transfusion within a 24-hour period
C)In a patient who is pregnant
D)In a bone marrow transplant recipient

Accepted Answer

The performance of a crossmatch for a massively transfused patient may be omitted if the total patient volume has been exchanged (10 to 12 units of whole blood)within 24 hours.

Question 6

All of the following may be used to perform an antibody screen for an infant less than 4 months old except:
A)infant serum.
B)paternal serum.
C)maternal serum.
D)infant eluate.

Accepted Answer

The father's serum is not useful when screening for antibodies in an infant.

Question 7

How many units of red blood cells are required to raise the hematocrit of a 70-kg nonbleeding adult man from 24% to 30%?
A)1
B)2
C)3
D)4

Accepted Answer

Each red cell unit should raise the hematocrit by 3%.

Question 8

In which phase of reactivity would rouleaux typically be detected in the screen? A)4^$\circ$ C B)15^$\circ$ C C)37^$\circ$ C D)Antihuman globulin

Accepted Answer

In the screen,37^$\circ$ C is typically where rouleaux are initially detected.

Question 9

To increase the sensitivity of the antibody screen in a compatibility test,what can be done?
A)Extend the incubation time.
B)Increase the serum-to-cell ratio.
C)Use an enhancement such as polyethylene glycol.
D)All of the above are correct.

Accepted Answer

Extending the incubation time,increasing the serum to cell ratio,and using an enhancement such as polyethylene glycol will all increase sensitivity.

Question 10

A tube was received in the blood bank for crossmatching.The label was torn and the only information that was visible was the patient's last name and the medical record number.Which of the following is an acceptable procedure?
A)Request a recollection of the specimen.
B)Call the phlebotomist back to relabel the tube.
C)Reprint a label using the MRI as the identifier.
D)Use the tube since the MRI is visible.

Accepted Answer

Tubes used for crossmatching must have the patient's name,unique number,date and time of collection and phlebotomist identifier at the minimum.Tubes that do not have proper labels should not be used and recollection is necessary.

Quiz 8: Compatibility Testing

A 29-year-old female was admitted to the emergency room with severe bleeding.The blood type was tested and determined to be AB,D negative.Six units of RBCs are ordered STAT.Of the following types available in the blood bank,which would be the most preferable for crossmatch?

To what does the abbreviation "MSBOS" refer?

The use of the electronic (computer) crossmatch is restricted to recipients who:

A donor unit with a positive DAT would cause reactions at what phase of the crossmatch?

In which of the following situations can the crossmatch test be omitted?

All of the following may be used to perform an antibody screen for an infant less than 4 months old except:

How many units of red blood cells are required to raise the hematocrit of a 70-kg nonbleeding adult man from 24% to 30%?

In which phase of reactivity would rouleaux typically be detected in the screen?

To increase the sensitivity of the antibody screen in a compatibility test,what can be done?

A tube was received in the blood bank for crossmatching.The label was torn and the only information that was visible was the patient's last name and the medical record number.Which of the following is an acceptable procedure?