Platelets must be stored upright in separate

Platelets must be stored upright in separate
containers
D.
Platelets require constant agitation at 20°C–24°C
Blood bank/Apply knowledge of standard operating
procedures/Blood components/Processing/1

152 Chapter 4 | Immunohematology
19.
Transfusion of an irradiated product is indicated
in all of the following conditions except :
A.
Exchange transfusion
B.
Bone marrow transplant
C.
Severe combined immunodeficiency syndrome
(SCIDS)
D.
Warm autoimmune hemolytic anemia (WAIHA)
Blood bank/Select course of action/Hemotherapy/
Irradiation/2
20.
What percentage of red cells must be retained in
leukocyte-reduced red cells?
A.
75%
B.
80%
C.
85%
D.
100%
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21.
Which of the following is true regarding
granulocyte concentrates?
A.
The product must contain a maximum of
1.0 × 10 10 granulocytes
B.
The pH must be 6.0
C.
The product must be crossmatched
D.
The product must be irradiated
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procedures/Blood components/2
22.
What course of action should be taken if a medical
laboratory scientist inadvertently irradiates a unit
of red cells twice?
A.
Issue the unit
B.
Discard the unit
C.
Change the expiration date; then issue the unit
D.
Note on the irradiation sticker that the unit was
irradiated twice and issue
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23.
What components(s) may be shipped together
with FFP?
A.
Frozen RBCs and cryoprecipitate
B.
Platelets
C.
Packed RBCs and granulocytes
D.
Double red cell
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procedures/Blood components/FFP/1
24.
A blood supplier ships 3 units of pooled
cryoprecipitate. Each pool consists of 5 units of
cryoprecipitate. If one unit is thawed at 5:00 p.m.,
when must it be dispensed from the blood bank?
A.
Before 9:00 p.m.
B.
Before 11:00 p.m.
C.
Before 12:00 a.m.
D.
Before 5:00 p.m. the next day
Blood bank/Apply knowledge of standard operating
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Answers to Questions 19–26
19. D WAIHA would not require irradiation unless the
patient had an underlying immunosuppressive
disorder.
20. C A red cell unit that has been leukocyte reduced must
retain 85% of original red cells.
21. C
Granulocyte concentrates contain a large amount of
red cells and must be crossmatched with the
recipient’s serum.
22. B
If a technologist mistakenly irradiates a unit of red
cells more than once, the unit must be discarded due
to subsequent potassium accumulation. This does
not apply to platelets.
23. A FFP requires dry ice for shipment. Frozen RBCs and
cryoprecipitate also require dry ice.
24. A
Pooled cryoprecipitate is a closed system; however, it
has an outdate of 4 hours once thawed.
25. A Gamma rays or x-rays have the ability to prohibit a
lymphocyte’s ability to divide, preventing TA-GVHD.
26. C
Frozen RBCs may be kept for up to 10 years. FFP and
Cryo stored at -18°C or lower expire in 1 year. If FFP is
kept at -65°C or lower, the expiration time is 7 years.