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20 Cards in this Set
- Front
- Back
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If donor cells were coated with antibody resulting in a positive DAT, what phase of the major crossmatch would generally react?
A) IS B) 37 C) AHG D) none of the above |
c) AHG
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What blood type should be transfused when crisis does not permit time to collect and test a patient sample?
A) AB positive B) O positive C) O negative D) A negative |
c) O negative
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Why is it acceptable to transfuse an AB person with A packed red blood cells but unacceptable to transfuse type A whole blood?
A) The anti-A in donor whole blood would sensitize recipient cells. B) The anti-B in donor whole blood would sensitize recipient cells. C) The anti-A,B in donor whole blood would sensitize recipient cells. D) none of the above |
b) The anti-B in donor whole blood would sensitize recipient cells.
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How can the sensitivity of antibody detection be increased? A) Increase the ratio of patient serum to screening cells. B) Extend the incubation time. C) Add potentiators such as albumin. D) all of the above . |
d) all of the above
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How can the sensitivity of antibody detection be increased? A) Increase the ratio of patient serum to screening cells. B) Extend the incubation time. C) Add potentiators such as albumin. D) all of the above |
d) all of the above
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What does compatibility testing include?
A) ABO, Rh, antibody screen, major crossmatch B) ABO, Rh, DAT, major crossmatch C) ABO, antibody screen, major crossmatch, elution D) ABO, Rh, antibody screen, minor crossmatch |
a) ABO, Rh, antibody screen, major crossmatch
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All of the following antibodies are clinically significant except:
A) anti-C B) anti-K C) anti-Fya. D) anti-Bga |
d) anti Bga
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Why was the minor crossmatch discontinued?
A) Too many cold autoantibodies were being detected B) The only product being made from donors was packed red blood cells, and plasma was residual. C) Antibody screen was incorporated into donor processing. D) none of the above |
c) antibody screen was incorporated into donor processing
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Which of the following is true regarding blood issued on an emergency basis without patient testing?
A) The patient sample is tested for only ABO and Rh at a later time. B) Units are tagged for emergency release and no further testing is done. C) Units are tagged for emergency release and segments are pulled for later testing. D) The medical technician must authorize the emergency transfusion |
c) Units are tagged for emergency release and segments are pulled for later testing
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A type and screen is done on a 49-year-old woman who is scheduled for a hysterectomy in one week. Her blood type is A positive and her antibody screen was positive. What must be done before her surgery date?
A) identify antibody B) identify antibody and phenotype units C) phenotype the patient D) identify antibody and phenotype platelets |
b) identify antibody and phenotype units
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11.
Given the following results, what is the probable cause of a positive reaction in the major crossmatch? IS = 0 37 = 0 AHG = 2+ CC = ND Autocontrol was negative A) alloantibody in patient serum reacting with antigen on donor cells B) incorrect ABO grouping of patient or donor C) autoantibody in patient serum reacting with antigen on donor cells D) rouleaux |
a) alloantibody in patient serum reacting with antigen on donor cells
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12.
The transfusion nurse calls the blood bank 5 minutes after a unit of packed cells were issued to say that the unit is not needed at this time. It is important for the nurse to bring the unit back immediately so that the temperature of the unit does not exceed: A) 4°C B) 10°C C) 22°C D) 37°C |
b) 10c
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13.
What does the minor crossmatch consist of? A) mixing donor plasma with patient red blood cells B) mixing patient serum with donor red blood cells C) an immediate spin major crossmatch D) none of the above |
a) mixing donor plasma with patient red blood cells
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14.
What alternative type can be given to an O-positive person when group O blood is not available? A) A packed cells B) B packed cells C) AB packed cells D) none |
d) none
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15.
What is the most common cause of clerical errors in transfusion therapy? A) entering an erroneous ABO type B) misidentification of the patient C) entering an erroneous crossmatch result D) labeling units as antigen positive instead of antigen negative when phenotyping |
b) misidentification of the patient
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16.
What is an "electronic" crossmatch? A) a data base compiled by the American Red Cross for rare phenotype accessibility B) comparison of donor and patient ABO groups and serologic data from a computer file C) a crossmatch performed in microtiter plates and read by a spectrophotometer D) all of the above |
b) comparison performed in microtiter plates and read by a spectrophotometer
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17.
In what phase of reactivity is rouleaux usually found? A) IS B) 37 C) AHG D) none of the above |
b) 37
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18.
Which tests must be performed on the donor sample? A) ABO, Rh, Du, antibody screen B) ABO, Rh, antibody screen C) ABO, Rh, DAT D) all of the above |
a) ABO, Rh, DAT, antibody screen
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19.
Mixing patient serum and donor red cells together and observing for direct cell lysis or agglutination is know as: A) the Donath-Landsteiner test B) a minor crossmatch C) a major crossmatch D) an autohemolysis test |
c) a major crossmatch
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20.
When can an immediate spin crossmatch be performed? A) when antibody screen is negative B) when patient has history of antibody C) when patient has a history of anti-K, but the antibody screen was negative D) none of the above |
a) when antibody screen is negative
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