MLT 106 Test 3 ABO and Rh Blood
System Groups 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
The ABO system was discovered in 1901 by _____ - 🧠ANSWER ✔✔Karl
Landsteiner
Almost all healthy people older than ____ of age have _______ to the ABO
antigens they lack - 🧠ANSWER ✔✔3-6 months; naturally occurring
antibodies
Landsteiner demonstrated that a person's serum contained
antibodies(naturally occurring) against ______ - 🧠ANSWER ✔✔an antigen
absent from his own red blood cells; also termed *isohemagglutinins*
"Landsteiner's Rule" states:
If the ABO *antigen is present on the cells,* ______
If the ABO *antibody is present in the serum,* ______ - 🧠ANSWER ✔✔- the
corresponding *antibody will be absent from the serum*
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,- the corresponding *antigen will be absent on the cells*
The ABO blood group system remains the most important in ______ and
____ practice. - 🧠ANSWER ✔✔Transfusion and transplantation
An *incompatible ABO transfusion* results to _______ - 🧠ANSWER
✔✔acute intravascular hemolysis and renal failure , and can be fatal
Today, ABO typing reagents are manufactured from _____ derived from
culture cell lines, which have several advantages over conventional human
and plant ABO reagents. - 🧠ANSWER ✔✔monoclonal antibodies;
- Major advantages is *reproducibility*
; undesired antibody specificities are also excluded from the antisera
Anti-A reagent is - 🧠ANSWER ✔✔Blue
Anti-B reagent is - 🧠ANSWER ✔✔Yellow
There is always an ________ between the *forward and reverse type;*
thus, one serves as a check on the other. - 🧠ANSWER ✔✔inverse
reciprocal relationship
Phenotype *A* - 🧠ANSWER ✔✔*Forward typing*
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,+,=
*Reverse typing*
=, +
Phenotype *B* - 🧠ANSWER ✔✔*Forward typing*
=, +
*Reverse typing*
+, =
Phenotype *AB* - 🧠ANSWER ✔✔*Forward typing*
+, +
*Reverse typing*
=, =
Phenotype *O* - 🧠ANSWER ✔✔*Forward typing*
=, =
*Reverse typing*
+, +
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STATEMENT. ALL RIGHTS RESERVED
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, Forward Grouping (also known as front type): - 🧠ANSWER ✔✔Testing for
an individual's ABO antigens( unknown antigens on the red blood cells)
using antisera (reagents with known ABO antibodies)
; Anti-A
; Anti-B
Reverse Grouping (also known as back type) - 🧠ANSWER ✔✔Testing for
the presence or absence of individual ABO antibodies(unknown antibodies)
using reagent red blood cells(known antigens)
; 2 to 4% suspension of Reagent A1 Cells
; 2 to 4% suspension of Reagent B Cells
The major antigens of the ABO systems are: - 🧠ANSWER ✔✔A
B
H(O)
The major antibodies of the ABO system: - 🧠ANSWER ✔✔Anti-A
Anti-B
Anti-A,B
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
System Groups 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
The ABO system was discovered in 1901 by _____ - 🧠ANSWER ✔✔Karl
Landsteiner
Almost all healthy people older than ____ of age have _______ to the ABO
antigens they lack - 🧠ANSWER ✔✔3-6 months; naturally occurring
antibodies
Landsteiner demonstrated that a person's serum contained
antibodies(naturally occurring) against ______ - 🧠ANSWER ✔✔an antigen
absent from his own red blood cells; also termed *isohemagglutinins*
"Landsteiner's Rule" states:
If the ABO *antigen is present on the cells,* ______
If the ABO *antibody is present in the serum,* ______ - 🧠ANSWER ✔✔- the
corresponding *antibody will be absent from the serum*
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,- the corresponding *antigen will be absent on the cells*
The ABO blood group system remains the most important in ______ and
____ practice. - 🧠ANSWER ✔✔Transfusion and transplantation
An *incompatible ABO transfusion* results to _______ - 🧠ANSWER
✔✔acute intravascular hemolysis and renal failure , and can be fatal
Today, ABO typing reagents are manufactured from _____ derived from
culture cell lines, which have several advantages over conventional human
and plant ABO reagents. - 🧠ANSWER ✔✔monoclonal antibodies;
- Major advantages is *reproducibility*
; undesired antibody specificities are also excluded from the antisera
Anti-A reagent is - 🧠ANSWER ✔✔Blue
Anti-B reagent is - 🧠ANSWER ✔✔Yellow
There is always an ________ between the *forward and reverse type;*
thus, one serves as a check on the other. - 🧠ANSWER ✔✔inverse
reciprocal relationship
Phenotype *A* - 🧠ANSWER ✔✔*Forward typing*
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,+,=
*Reverse typing*
=, +
Phenotype *B* - 🧠ANSWER ✔✔*Forward typing*
=, +
*Reverse typing*
+, =
Phenotype *AB* - 🧠ANSWER ✔✔*Forward typing*
+, +
*Reverse typing*
=, =
Phenotype *O* - 🧠ANSWER ✔✔*Forward typing*
=, =
*Reverse typing*
+, +
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, Forward Grouping (also known as front type): - 🧠ANSWER ✔✔Testing for
an individual's ABO antigens( unknown antigens on the red blood cells)
using antisera (reagents with known ABO antibodies)
; Anti-A
; Anti-B
Reverse Grouping (also known as back type) - 🧠ANSWER ✔✔Testing for
the presence or absence of individual ABO antibodies(unknown antibodies)
using reagent red blood cells(known antigens)
; 2 to 4% suspension of Reagent A1 Cells
; 2 to 4% suspension of Reagent B Cells
The major antigens of the ABO systems are: - 🧠ANSWER ✔✔A
B
H(O)
The major antibodies of the ABO system: - 🧠ANSWER ✔✔Anti-A
Anti-B
Anti-A,B
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
