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MEDICAL LABORATORY TECHNICIAN (MLT)
EXAMINATION
COMPREHENSIVE PRACTICE QUESTION
BANK
2026-2027 ACADEMIC YEAR | 250+
QUESTIONS WITH RATIONALES
itsjereguides
# TABLE OF CONTENTS
| Section | Content Area | Exam Weight | Questions |
|---------|--------------|-------------|-----------|
| **I** | **Blood Banking (Immunohematology)** | 15-20% | Q1-Q45 |
| **II** | **Urinalysis & Other Body Fluids** | 5-10% | Q46-Q70 |
| **III** | **Clinical Chemistry** | 20-25% | Q71-Q120 |
| **IV** | **Hematology** | 20-25% | Q121-Q175 |
| **V** | **Immunology** | 5-10% | Q176-Q200 |
| **VI** | **Microbiology** | 15-20% | Q201-Q245 |
| **VII** | **Laboratory Operations** | 5-10% | Q246-Q260+ |
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# SECTION I: BLOOD BANKING (IMMUNOHEMATOLOGY)
## 15-20% of Total Examination
### Q1. A patient's blood sample agglutinates strongly with anti-A reagent and shows no
agglutination with anti-B reagent. The reverse grouping shows agglutination with B cells but not
with A cells. What is the most likely blood type?
A) Type A positive
B) Type B positive
C) Type O positive
D) Type AB positive
**Correct Answer: A) Type A positive**
**Rationale:** Forward grouping (cell typing) demonstrates the presence of A antigens on the
patient's red blood cells (agglutination with anti-A) and absence of B antigens (no reaction with
anti-B). Reverse grouping (serum typing) shows the presence of anti-B antibodies in the patient's
serum (agglutination with B cells) and absence of anti-A antibodies (no reaction with A cells).
This pattern is consistent with blood type A. The Rh status (positive/negative) requires testing
with anti-D reagent, which was not specified in the question stem.
**Distractor Analysis:**
- **B) Type B positive:** Would show agglutination with anti-B and anti-A antibodies in serum,
opposite of what is observed.
- **C) Type O positive:** Would show no agglutination with either anti-A or anti-B reagents,
and both anti-A and anti-B antibodies in serum.
- **D) Type AB positive:** Would show agglutination with both anti-A and anti-B reagents and
no antibodies in serum.
---
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### Q2. A technologist performs an antibody screen using a three-cell panel. Cells 1 and 2 show
2+ reactions at the immediate spin, 37°C, and AHG phases, while Cell 3 shows no reaction. All
cells are negative after the addition of IgG-sensitized red blood cells at the AHG phase. What is
the most likely antibody specificity?
A) Anti-A
B) Anti-B
C) Cold autoantibody
D) Anti-D
**Correct Answer: C) Cold autoantibody**
**Rationale:** The reaction pattern shows reactivity at immediate spin, 37°C, and AHG phases
with two cells but not the third. The negative control (IgG-sensitized RBCs) at AHG confirms
the AHG reagent is working properly. This pattern is characteristic of a cold-reactive
autoantibody, which typically demonstrates reactivity at lower temperatures but may also react at
37°C if it has a wide thermal amplitude. The fact that it reacts with some cells (panel cells 1 and
2) but not others suggests antibody specificity directed against a high-incidence antigen or a
common antigen present on the reactive cells.
**Distractor Analysis:**
- **A) Anti-A:** Would show specific reactivity only with A-positive cells, not a pattern
affecting multiple panel cells.
- **B) Anti-B:** Would show specific reactivity only with B-positive cells.
- **D) Anti-D:** Would show reactivity with Rh-positive cells and would typically be detected
at AHG phase, not at immediate spin.
---
### Q3. A patient with blood type O negative requires an emergency transfusion. Which of the
following blood products is the most appropriate to transfuse?
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A) Type A negative packed red blood cells
B) Type B negative packed red blood cells
C) Type O negative packed red blood cells
D) Type AB positive packed red blood cells
**Correct Answer: C) Type O negative packed red blood cells**
**Rationale:** Type O negative red blood cells are the universal donor red blood cells because
they lack A, B, and Rh (D) antigens. A patient with type O blood has both anti-A and anti-B
antibodies in their plasma, which would destroy any transfused red cells that carry A or B
antigens. Additionally, an Rh-negative patient should receive Rh-negative blood to prevent
alloimmunization to the D antigen. In emergency situations where there is no time for
crossmatching, type O negative packed red blood cells are the safest choice.
**Distractor Analysis:**
- **A) Type A negative:** Contains A antigens which would be destroyed by the patient's anti-A
antibodies.
- **B) Type B negative:** Contains B antigens which would be destroyed by the patient's anti-B
antibodies.
- **D) Type AB positive:** Contains both A and B antigens and the Rh D antigen, all of which
would be incompatible with the patient's antibodies.
---
### Q4. A crossmatch is performed on a patient with a known history of anti-E. The donor units
selected are E-negative. The crossmatch shows 2+ reactivity at the AHG phase with all units
tested. What is the most likely explanation?
A) Anti-E is present in the patient's serum
MEDICAL LABORATORY TECHNICIAN (MLT)
EXAMINATION
COMPREHENSIVE PRACTICE QUESTION
BANK
2026-2027 ACADEMIC YEAR | 250+
QUESTIONS WITH RATIONALES
itsjereguides
# TABLE OF CONTENTS
| Section | Content Area | Exam Weight | Questions |
|---------|--------------|-------------|-----------|
| **I** | **Blood Banking (Immunohematology)** | 15-20% | Q1-Q45 |
| **II** | **Urinalysis & Other Body Fluids** | 5-10% | Q46-Q70 |
| **III** | **Clinical Chemistry** | 20-25% | Q71-Q120 |
| **IV** | **Hematology** | 20-25% | Q121-Q175 |
| **V** | **Immunology** | 5-10% | Q176-Q200 |
| **VI** | **Microbiology** | 15-20% | Q201-Q245 |
| **VII** | **Laboratory Operations** | 5-10% | Q246-Q260+ |
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# SECTION I: BLOOD BANKING (IMMUNOHEMATOLOGY)
## 15-20% of Total Examination
### Q1. A patient's blood sample agglutinates strongly with anti-A reagent and shows no
agglutination with anti-B reagent. The reverse grouping shows agglutination with B cells but not
with A cells. What is the most likely blood type?
A) Type A positive
B) Type B positive
C) Type O positive
D) Type AB positive
**Correct Answer: A) Type A positive**
**Rationale:** Forward grouping (cell typing) demonstrates the presence of A antigens on the
patient's red blood cells (agglutination with anti-A) and absence of B antigens (no reaction with
anti-B). Reverse grouping (serum typing) shows the presence of anti-B antibodies in the patient's
serum (agglutination with B cells) and absence of anti-A antibodies (no reaction with A cells).
This pattern is consistent with blood type A. The Rh status (positive/negative) requires testing
with anti-D reagent, which was not specified in the question stem.
**Distractor Analysis:**
- **B) Type B positive:** Would show agglutination with anti-B and anti-A antibodies in serum,
opposite of what is observed.
- **C) Type O positive:** Would show no agglutination with either anti-A or anti-B reagents,
and both anti-A and anti-B antibodies in serum.
- **D) Type AB positive:** Would show agglutination with both anti-A and anti-B reagents and
no antibodies in serum.
---
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### Q2. A technologist performs an antibody screen using a three-cell panel. Cells 1 and 2 show
2+ reactions at the immediate spin, 37°C, and AHG phases, while Cell 3 shows no reaction. All
cells are negative after the addition of IgG-sensitized red blood cells at the AHG phase. What is
the most likely antibody specificity?
A) Anti-A
B) Anti-B
C) Cold autoantibody
D) Anti-D
**Correct Answer: C) Cold autoantibody**
**Rationale:** The reaction pattern shows reactivity at immediate spin, 37°C, and AHG phases
with two cells but not the third. The negative control (IgG-sensitized RBCs) at AHG confirms
the AHG reagent is working properly. This pattern is characteristic of a cold-reactive
autoantibody, which typically demonstrates reactivity at lower temperatures but may also react at
37°C if it has a wide thermal amplitude. The fact that it reacts with some cells (panel cells 1 and
2) but not others suggests antibody specificity directed against a high-incidence antigen or a
common antigen present on the reactive cells.
**Distractor Analysis:**
- **A) Anti-A:** Would show specific reactivity only with A-positive cells, not a pattern
affecting multiple panel cells.
- **B) Anti-B:** Would show specific reactivity only with B-positive cells.
- **D) Anti-D:** Would show reactivity with Rh-positive cells and would typically be detected
at AHG phase, not at immediate spin.
---
### Q3. A patient with blood type O negative requires an emergency transfusion. Which of the
following blood products is the most appropriate to transfuse?
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A) Type A negative packed red blood cells
B) Type B negative packed red blood cells
C) Type O negative packed red blood cells
D) Type AB positive packed red blood cells
**Correct Answer: C) Type O negative packed red blood cells**
**Rationale:** Type O negative red blood cells are the universal donor red blood cells because
they lack A, B, and Rh (D) antigens. A patient with type O blood has both anti-A and anti-B
antibodies in their plasma, which would destroy any transfused red cells that carry A or B
antigens. Additionally, an Rh-negative patient should receive Rh-negative blood to prevent
alloimmunization to the D antigen. In emergency situations where there is no time for
crossmatching, type O negative packed red blood cells are the safest choice.
**Distractor Analysis:**
- **A) Type A negative:** Contains A antigens which would be destroyed by the patient's anti-A
antibodies.
- **B) Type B negative:** Contains B antigens which would be destroyed by the patient's anti-B
antibodies.
- **D) Type AB positive:** Contains both A and B antigens and the Rh D antigen, all of which
would be incompatible with the patient's antibodies.
---
### Q4. A crossmatch is performed on a patient with a known history of anti-E. The donor units
selected are E-negative. The crossmatch shows 2+ reactivity at the AHG phase with all units
tested. What is the most likely explanation?
A) Anti-E is present in the patient's serum
