IMMUNOHEMATOLOGY QUIZ 2 QUESTIONS AND
ANSWERS
What ABO phenotype would agglutinate in the presence of anti-A,B produced by group
O individuals - Correct Answers -A and B
Which ABO phenotype selection contains the most H antigen and the least H antigen,
respectively, on the red cell's surface? - Correct Answers -O, A1B
recipient with group A phenotype requires a transfusion of 2 units of frozen plasma.
Which of the following types are appropriate to select for transfusion? - Correct Answers
-AB and A
A patient's red cells are agglutinated by anti-B, but not by anti-A. What is this patient's
ABO phenotype - Correct Answers -Group B
What is the test procedure that combines patient's serum with commercial A1 and B
reagent red cells? - Correct Answers -ABO reverse grouping
A group A man marries a group AB woman. The father of the group A man was group
O. What possible ABO phenotypes could be expected in the offspring - Correct Answers
-Groups A, B, and AB
Why are antibodies to Lub antigen not commonly detected? - Correct Answers -Lub
antigen is of high incidence.
What phenotype will be expressed when the Le, Se, and H genes are inherited? -
Correct Answers -Le(a-b+)
Predict the probable antibody's identity if all red cells tested at room temperature are
positive with a patient's serum except for cord cells. - Correct Answers -Anti-I
According to Landsteiner's rule (law), what ABO antibody will be detected in a group A
individual's serum - Correct Answers -Anti-B
Select the appropriate strategy if the results of red cell and serum testing in the ABO
typing procedure have negative agglutination reactions - Correct Answers -Incubate
tubes at room temperature or 4° C with an autocontrol
Predict the agglutination reaction of red cells from a Bombay phenotype when combined
with anti-H lectin. - Correct Answers -Negative
Given the following ABO phenotyping data:
, FORWARDREVERSEAnti-A: 2+mfA1 cells: 0Anti-B: 0B cells: 3+
What could be a plausible explanation for this discrepancy? - Correct Answers -Group
O blood products given to group A
What forward typing reagent can be used to confirm group O units before placing them
in inventory - Correct Answers -Anti-A,B
A blood sample from a 90-year-old man was submitted to the blood bank for a type and
screen before surgery. The forward type demonstrates as a group A, whereas the
reverse type appears to be group AB. What is the most likely cause of the discrepancy -
Correct Answers -That patient has low-titer isoagglutinins
Most "naturally occurring" ABO system antibodies fall into which immunoglobulin class -
Correct Answers -IgM
What substances are found in the saliva of a group A person who also inherited the
secretor gene - Correct Answers -A, H
What percentage of the group A population are type as A2? - Correct Answers -20%
Approximately what is the percentage of individuals who demonstrate H in their saliva? -
Correct Answers -80%
To distinguish between an A1 and A2 blood type, which reagent is used - Correct
Answers -Dolichos biflorus lectin
Why is it sometimes necessary to distinguish A1 and A2 blood types? - Correct
Answers -To resolve a discrepancy between the forward and reverse typing
What subgroup of A possesses the least amount of A antigen - Correct Answers -Ael
A in whites - Correct Answers -40 percent
O in blacks - Correct Answers -49 percent
A in asians - Correct Answers -28 percent
A in blacks - Correct Answers -27 percent
B in blacks - Correct Answers -20 percent
B in whites - Correct Answers -11 percent
AB whites - Correct Answers -4 percent
AB asians - Correct Answers -5 percent
ANSWERS
What ABO phenotype would agglutinate in the presence of anti-A,B produced by group
O individuals - Correct Answers -A and B
Which ABO phenotype selection contains the most H antigen and the least H antigen,
respectively, on the red cell's surface? - Correct Answers -O, A1B
recipient with group A phenotype requires a transfusion of 2 units of frozen plasma.
Which of the following types are appropriate to select for transfusion? - Correct Answers
-AB and A
A patient's red cells are agglutinated by anti-B, but not by anti-A. What is this patient's
ABO phenotype - Correct Answers -Group B
What is the test procedure that combines patient's serum with commercial A1 and B
reagent red cells? - Correct Answers -ABO reverse grouping
A group A man marries a group AB woman. The father of the group A man was group
O. What possible ABO phenotypes could be expected in the offspring - Correct Answers
-Groups A, B, and AB
Why are antibodies to Lub antigen not commonly detected? - Correct Answers -Lub
antigen is of high incidence.
What phenotype will be expressed when the Le, Se, and H genes are inherited? -
Correct Answers -Le(a-b+)
Predict the probable antibody's identity if all red cells tested at room temperature are
positive with a patient's serum except for cord cells. - Correct Answers -Anti-I
According to Landsteiner's rule (law), what ABO antibody will be detected in a group A
individual's serum - Correct Answers -Anti-B
Select the appropriate strategy if the results of red cell and serum testing in the ABO
typing procedure have negative agglutination reactions - Correct Answers -Incubate
tubes at room temperature or 4° C with an autocontrol
Predict the agglutination reaction of red cells from a Bombay phenotype when combined
with anti-H lectin. - Correct Answers -Negative
Given the following ABO phenotyping data:
, FORWARDREVERSEAnti-A: 2+mfA1 cells: 0Anti-B: 0B cells: 3+
What could be a plausible explanation for this discrepancy? - Correct Answers -Group
O blood products given to group A
What forward typing reagent can be used to confirm group O units before placing them
in inventory - Correct Answers -Anti-A,B
A blood sample from a 90-year-old man was submitted to the blood bank for a type and
screen before surgery. The forward type demonstrates as a group A, whereas the
reverse type appears to be group AB. What is the most likely cause of the discrepancy -
Correct Answers -That patient has low-titer isoagglutinins
Most "naturally occurring" ABO system antibodies fall into which immunoglobulin class -
Correct Answers -IgM
What substances are found in the saliva of a group A person who also inherited the
secretor gene - Correct Answers -A, H
What percentage of the group A population are type as A2? - Correct Answers -20%
Approximately what is the percentage of individuals who demonstrate H in their saliva? -
Correct Answers -80%
To distinguish between an A1 and A2 blood type, which reagent is used - Correct
Answers -Dolichos biflorus lectin
Why is it sometimes necessary to distinguish A1 and A2 blood types? - Correct
Answers -To resolve a discrepancy between the forward and reverse typing
What subgroup of A possesses the least amount of A antigen - Correct Answers -Ael
A in whites - Correct Answers -40 percent
O in blacks - Correct Answers -49 percent
A in asians - Correct Answers -28 percent
A in blacks - Correct Answers -27 percent
B in blacks - Correct Answers -20 percent
B in whites - Correct Answers -11 percent
AB whites - Correct Answers -4 percent
AB asians - Correct Answers -5 percent
