1
Q
What is the antigen precursor to A & B?
A
H antigen
2
Q
A & B antigen expression may decrease due to:
A
Age
Pregnancy
Leukemia
Mylodysolastic Syndrome
Thalassemia/Diamond-Blackfan Anemia (stress hematopoiesis)
3
Q
A1 Frequencies
A
4
Q
A2 Frequencies
A
5
Q
B Frequencies
A
6
Q
O Frequencies
A
7
Q
A1B Frequencies
A
8
Q
Group A HDFN Reaction
A
None to moderate (rarely)
9
Q
Group AB HDFN Reaction
A
None to severe
O makes anti-AB which can cross the placenta more easily than A or B antibodies; it also reacts strongly with subgroups.
10
Q
Acquired B Syndrome
A
Modification of A1 Ag after a bacterial infection that causes cross-reactivity with some B reagents
American Red Cross IRL
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