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Blood Bank ASCP 2026 Exam ||Verified Exam!!!|| Most
Recent Exam Actual Complete Real Exam Questions
And Correct Answers (Verified Answers) Already
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Why do IgM antibodies, such as those formed against the
ABO antigens, have the ability to directly agglutinate red
blood cells (RBCs) and cause visible agglutination? -
Answer-IgM antibodies are larger molecules and have the
ability to bind more antigen
Which of the following enhancement mediums decreases
the zeta potential, allowing antibody and antigen to come
closer together? - Answer-LISS.
LISS contains a reduced concentration of NaCl (0.2%) and
results in a reduction in charged ions within the ionic
cloud, decreasing the zeta potential and facilitating antigen
and antibody interaction.
This type of antibody response is analogous to an
anamnestic antibody reaction. - Answer-Secondary.
An anamnestic response is a secondary immune response
in which memory lymphocytes respond rapidly to foreign
,2|Page
antigen in producing specific antibody. The antibodies are
IgG and are produced
at lower doses of antigen than in the primary response.
Which antibodies to a component of complement are
contained in the rabbit polyspecific antihuman globulin
reagent for detection of in vivo sensitization? - Answer-In
the DAT (direct antiglobulin test), rabbit
polyspecific antisera contains both an anti-human IgG
component and an antibody against the C3d component of
complement.
Which of the following distinguishes A1 from A2 blood
groups?
A. A2 antigen will not react with anti-A, A1 will
react strongly (4+)
B. An A2 person may form anti-A1; an A1 person
will not form anti-A1
C. An A1 person may form anti-A2, an A2 person
will not form anti-A1
D. A2 antigen will not react with anti-A from a
nonimmunized donor; A1 will react with any anti-A -
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Answer-B. An A2 person may form anti-A1; an A1 person
will not form anti-A1
A patient's serum is incompatible with O cells. The patient
RBCs give a negative reaction to anti-H lectin. What is the
most likely cause of these results? - Answer-Bombay is
the only ABO phenotype incompatible with O cells. The
red cells of a Bombay show a negative reaction to anti-H
because the cells contain no H substance
What antibodies are formed by a Bombay
individual? - Answer-Anti-A, B, and H
Acquired B antigens have been found in: - Answer-Group
A persons.
Blood is crossmatched on an A positive person with a
negative antibody screen. The patient received a
transfusion of A positive RBCs 3 years ago. The donors
chosen for crossmatch were A positive.
The crossmatch was run on the Ortho Provue and yielded
3+ incompatibility. How can these results be explained? -
Answer-The patient is likely an A2 with anti-A1 which is
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causing reactivity in the crossmatch. A negative antibody
screen rules out the possibility of an antibody to a high-
frequency antigen, and two
donor units incompatible rules out an antibody to a low-
frequency antigen.
A patient's red cells forward as group O, serum
agglutinates B cells (4+) only. Your next step would be: -
Answer-Incubate washed red cells with anti-A1 and
anti-A,B for 30 minutes at room temperature.
The strong 4+ reaction in reverse grouping suggests the
discrepancy is in forward grouping. Incubating washed red
cells at room temperature with anti-A and anti-A,B will
enhance reactions.
Which typing results are most likely to occur when a
patient has an acquired B antigen?
A. Anti-A 4+, anti-B-3+, A1 cells neg, B cells neg
B. Anti-A 3+, anti-B neg, A1 cells neg, B cells neg
C. Anti-A 4+, anti-B 1+, A1 cells neg, B cells 4+
D. Anti-A 4+, anti-B 4+, A1 cells 2+, B cells neg - Answer-
C. Anti-A 4+, anti-B 1+, A1 cells neg, B cells 4+
Blood Bank ASCP 2026 Exam ||Verified Exam!!!|| Most
Recent Exam Actual Complete Real Exam Questions
And Correct Answers (Verified Answers) Already
Graded A+ | Guaranteed Success!! Newest Exam!!!
Why do IgM antibodies, such as those formed against the
ABO antigens, have the ability to directly agglutinate red
blood cells (RBCs) and cause visible agglutination? -
Answer-IgM antibodies are larger molecules and have the
ability to bind more antigen
Which of the following enhancement mediums decreases
the zeta potential, allowing antibody and antigen to come
closer together? - Answer-LISS.
LISS contains a reduced concentration of NaCl (0.2%) and
results in a reduction in charged ions within the ionic
cloud, decreasing the zeta potential and facilitating antigen
and antibody interaction.
This type of antibody response is analogous to an
anamnestic antibody reaction. - Answer-Secondary.
An anamnestic response is a secondary immune response
in which memory lymphocytes respond rapidly to foreign
,2|Page
antigen in producing specific antibody. The antibodies are
IgG and are produced
at lower doses of antigen than in the primary response.
Which antibodies to a component of complement are
contained in the rabbit polyspecific antihuman globulin
reagent for detection of in vivo sensitization? - Answer-In
the DAT (direct antiglobulin test), rabbit
polyspecific antisera contains both an anti-human IgG
component and an antibody against the C3d component of
complement.
Which of the following distinguishes A1 from A2 blood
groups?
A. A2 antigen will not react with anti-A, A1 will
react strongly (4+)
B. An A2 person may form anti-A1; an A1 person
will not form anti-A1
C. An A1 person may form anti-A2, an A2 person
will not form anti-A1
D. A2 antigen will not react with anti-A from a
nonimmunized donor; A1 will react with any anti-A -
,3|Page
Answer-B. An A2 person may form anti-A1; an A1 person
will not form anti-A1
A patient's serum is incompatible with O cells. The patient
RBCs give a negative reaction to anti-H lectin. What is the
most likely cause of these results? - Answer-Bombay is
the only ABO phenotype incompatible with O cells. The
red cells of a Bombay show a negative reaction to anti-H
because the cells contain no H substance
What antibodies are formed by a Bombay
individual? - Answer-Anti-A, B, and H
Acquired B antigens have been found in: - Answer-Group
A persons.
Blood is crossmatched on an A positive person with a
negative antibody screen. The patient received a
transfusion of A positive RBCs 3 years ago. The donors
chosen for crossmatch were A positive.
The crossmatch was run on the Ortho Provue and yielded
3+ incompatibility. How can these results be explained? -
Answer-The patient is likely an A2 with anti-A1 which is
, 4|Page
causing reactivity in the crossmatch. A negative antibody
screen rules out the possibility of an antibody to a high-
frequency antigen, and two
donor units incompatible rules out an antibody to a low-
frequency antigen.
A patient's red cells forward as group O, serum
agglutinates B cells (4+) only. Your next step would be: -
Answer-Incubate washed red cells with anti-A1 and
anti-A,B for 30 minutes at room temperature.
The strong 4+ reaction in reverse grouping suggests the
discrepancy is in forward grouping. Incubating washed red
cells at room temperature with anti-A and anti-A,B will
enhance reactions.
Which typing results are most likely to occur when a
patient has an acquired B antigen?
A. Anti-A 4+, anti-B-3+, A1 cells neg, B cells neg
B. Anti-A 3+, anti-B neg, A1 cells neg, B cells neg
C. Anti-A 4+, anti-B 1+, A1 cells neg, B cells 4+
D. Anti-A 4+, anti-B 4+, A1 cells 2+, B cells neg - Answer-
C. Anti-A 4+, anti-B 1+, A1 cells neg, B cells 4+
