Page 1 of 37
MLT ASCP COMPREHENSIVE EXAM 2026/2027 COMPLETE
CURRENT TESTING QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES.
MLT
Prepare for the MLT ASCP Comprehensive Exam with this focused study resource
designed to reinforce essential Medical Laboratory Technician concepts and exam-
related knowledge. Use it to review key areas, strengthen your understanding, and
identify topics that may require additional study. This resource provides a structured
supplement to your coursework and certification preparation. It can help you organize
your review and approach the MLT ASCP Comprehensive Exam with greater
confidence.
MULTPLE CHOICE.
SECTION 1: HEMATOLOGY (Questions 1–30)
1. A peripheral blood smear shows numerous schistocytes. The patient
has a low haptoglobin and elevated LDH. What is the most likely
diagnosis?
A. Iron deficiency anemia
B. Thalassemia minor
C. Thrombotic thrombocytopenic purpura (TTP)
D. Polycythemia vera
Answer: C
Rationale: Schistocytes (RBC fragments) + low haptoglobin + elevated
LDH = microangiopathic hemolytic anemia (MAHA). TTP/HUS are classic
causes. Iron deficiency causes microcytes, not schistocytes.
Thalassemia minor causes target cells, not schistocytes. Polycythemia
vera causes increased RBC mass, not hemolysis.
2. What is the expected CBC finding in a patient with untreated pernicious
anemia?
A. Microcytic, hypochromic RBCs, low RDW
B. Macrocytic RBCs, hypersegmented neutrophils, low RBC count
, Page 2 of 37
C. Normocytic RBCs, thrombocytosis
D. Spherocytes, high reticulocyte count
Answer: B
Rationale: Pernicious anemia (B12 deficiency) causes megaloblastic
anemia → macrocytic RBCs (high MCV), hypersegmented neutrophils (≥5
lobes), and low RBC count due to ineffective erythropoiesis.
3. A Wright-stained smear shows numerous blasts with Auer rods. Which
cytochemical stain would be most helpful?
A. Periodic acid-Schiff (PAS)
B. Sudan black B (or MPO)
C. Tartrate-resistant acid phosphatase (TRAP)
D. Non-specific esterase (NSE)
Answer: B
Rationale: Auer rods are pathognomonic for acute myeloid leukemia
(AML). Sudan black B (or myeloperoxidase) is positive in myeloid blasts.
PAS is positive in ALL and erythroleukemia. TRAP is positive in hairy cell
leukemia. NSE is positive in monocytic differentiation.
4. Which condition is associated with hemoglobin C (HbC) disease?
A. Target cells and crystals inside RBCs
B. Sickle cells on every field
C. Heinz bodies after splenectomy
D. Basophilic stippling only
Answer: A
Rationale: HbC disease is characterized by target cells and the presence
of HbC crystals inside RBCs. Sickle cells are seen in sickle cell disease.
Heinz bodies are associated with G6PD deficiency and unstable
hemoglobins.
5. The light-colored zone adjacent to the nucleus in a plasmacyte is the:
A. Ribosome
B. Chromatin
C. Mitochondria
D. Golgi area
, Page 3 of 37
Answer: D
Rationale: The light-colored zone adjacent to the nucleus in a plasma cell,
also known as the perinuclear halo or "hof," corresponds to the location of
the Golgi apparatus, which is responsible for packaging and secreting
antibodies.
6. What cell shape is most commonly associated with an increase in
MCHC?
A. Teardrop cells
B. Target cells
C. Spherocytes
D. Sickle cells
Answer: C
Rationale: Spherocytes are most commonly associated with an increased
MCHC because they have lost membrane surface area but retained
hemoglobin, resulting in a higher concentration of hemoglobin per unit
volume.
7. Which of the following characteristics are common to hereditary
spherocytosis, hereditary elliptocytosis, hereditary stomatocytosis, and
paroxysmal nocturnal hemoglobinuria?
A. Autosomal dominant inheritance
B. Red cell membrane defects
C. Positive direct anti-globulin test
D. Measured platelet count
Answer: B
Rationale: These conditions all involve red cell membrane defects.
Hereditary spherocytosis, elliptocytosis, and stomatocytosis are
inherited membrane disorders, while PNH is an acquired membrane
defect due to absence of GPI-anchored proteins.
8. Which of the following is most closely associated with iron deficiency
anemia?
A. Iron overload in tissue
B. Target cells
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C. Basophilic stippling
D. Chronic blood loss
Answer: D
Rationale: Chronic blood loss is the most common cause of iron
deficiency anemia in adults. Iron overload is seen in hemochromatosis.
Target cells are associated with liver disease and thalassemia. Basophilic
stippling is seen in lead poisoning and sideroblastic anemia.
9. A manual WBC count was performed. The cell counts for both sides
were 99 and 164, respectively. All nine large squares were counted on
each side. The dilution was 1:100. What should the technologist report?
A. 1,315 WBC/µL
B. 2,630 WBC/µL
C. Cannot report
D. 1,000 WBC/µL
Answer: C
Rationale: Cell counts from opposite sides of the hemacytometer that are
greater than 10% of one another are considered discrepant and should
not be used to calculate reportable results. This count should not be used
to report patient results.
10. The RBC inclusions shown in the photograph represent which of the
following?
A. Howell-Jolly bodies
B. Heinz bodies
C. Pappenheimer bodies
D. Basophilic stippling
Answer: A
Rationale: Howell-Jolly bodies are usually single, round, and positioned at
the periphery of the red blood cell. They are rarely found on a routine
peripheral blood smear, as they are usually removed by a functioning
spleen. They appear in megaloblastic anemias and after splenectomy.
11. Which of the following is a characteristic of Howell-Jolly bodies?
A. They are RNA remnants
MLT ASCP COMPREHENSIVE EXAM 2026/2027 COMPLETE
CURRENT TESTING QUESTIONS AND CORRECT
ANSWERS WITH DETAILED RATIONALES.
MLT
Prepare for the MLT ASCP Comprehensive Exam with this focused study resource
designed to reinforce essential Medical Laboratory Technician concepts and exam-
related knowledge. Use it to review key areas, strengthen your understanding, and
identify topics that may require additional study. This resource provides a structured
supplement to your coursework and certification preparation. It can help you organize
your review and approach the MLT ASCP Comprehensive Exam with greater
confidence.
MULTPLE CHOICE.
SECTION 1: HEMATOLOGY (Questions 1–30)
1. A peripheral blood smear shows numerous schistocytes. The patient
has a low haptoglobin and elevated LDH. What is the most likely
diagnosis?
A. Iron deficiency anemia
B. Thalassemia minor
C. Thrombotic thrombocytopenic purpura (TTP)
D. Polycythemia vera
Answer: C
Rationale: Schistocytes (RBC fragments) + low haptoglobin + elevated
LDH = microangiopathic hemolytic anemia (MAHA). TTP/HUS are classic
causes. Iron deficiency causes microcytes, not schistocytes.
Thalassemia minor causes target cells, not schistocytes. Polycythemia
vera causes increased RBC mass, not hemolysis.
2. What is the expected CBC finding in a patient with untreated pernicious
anemia?
A. Microcytic, hypochromic RBCs, low RDW
B. Macrocytic RBCs, hypersegmented neutrophils, low RBC count
, Page 2 of 37
C. Normocytic RBCs, thrombocytosis
D. Spherocytes, high reticulocyte count
Answer: B
Rationale: Pernicious anemia (B12 deficiency) causes megaloblastic
anemia → macrocytic RBCs (high MCV), hypersegmented neutrophils (≥5
lobes), and low RBC count due to ineffective erythropoiesis.
3. A Wright-stained smear shows numerous blasts with Auer rods. Which
cytochemical stain would be most helpful?
A. Periodic acid-Schiff (PAS)
B. Sudan black B (or MPO)
C. Tartrate-resistant acid phosphatase (TRAP)
D. Non-specific esterase (NSE)
Answer: B
Rationale: Auer rods are pathognomonic for acute myeloid leukemia
(AML). Sudan black B (or myeloperoxidase) is positive in myeloid blasts.
PAS is positive in ALL and erythroleukemia. TRAP is positive in hairy cell
leukemia. NSE is positive in monocytic differentiation.
4. Which condition is associated with hemoglobin C (HbC) disease?
A. Target cells and crystals inside RBCs
B. Sickle cells on every field
C. Heinz bodies after splenectomy
D. Basophilic stippling only
Answer: A
Rationale: HbC disease is characterized by target cells and the presence
of HbC crystals inside RBCs. Sickle cells are seen in sickle cell disease.
Heinz bodies are associated with G6PD deficiency and unstable
hemoglobins.
5. The light-colored zone adjacent to the nucleus in a plasmacyte is the:
A. Ribosome
B. Chromatin
C. Mitochondria
D. Golgi area
, Page 3 of 37
Answer: D
Rationale: The light-colored zone adjacent to the nucleus in a plasma cell,
also known as the perinuclear halo or "hof," corresponds to the location of
the Golgi apparatus, which is responsible for packaging and secreting
antibodies.
6. What cell shape is most commonly associated with an increase in
MCHC?
A. Teardrop cells
B. Target cells
C. Spherocytes
D. Sickle cells
Answer: C
Rationale: Spherocytes are most commonly associated with an increased
MCHC because they have lost membrane surface area but retained
hemoglobin, resulting in a higher concentration of hemoglobin per unit
volume.
7. Which of the following characteristics are common to hereditary
spherocytosis, hereditary elliptocytosis, hereditary stomatocytosis, and
paroxysmal nocturnal hemoglobinuria?
A. Autosomal dominant inheritance
B. Red cell membrane defects
C. Positive direct anti-globulin test
D. Measured platelet count
Answer: B
Rationale: These conditions all involve red cell membrane defects.
Hereditary spherocytosis, elliptocytosis, and stomatocytosis are
inherited membrane disorders, while PNH is an acquired membrane
defect due to absence of GPI-anchored proteins.
8. Which of the following is most closely associated with iron deficiency
anemia?
A. Iron overload in tissue
B. Target cells
, Page 4 of 37
C. Basophilic stippling
D. Chronic blood loss
Answer: D
Rationale: Chronic blood loss is the most common cause of iron
deficiency anemia in adults. Iron overload is seen in hemochromatosis.
Target cells are associated with liver disease and thalassemia. Basophilic
stippling is seen in lead poisoning and sideroblastic anemia.
9. A manual WBC count was performed. The cell counts for both sides
were 99 and 164, respectively. All nine large squares were counted on
each side. The dilution was 1:100. What should the technologist report?
A. 1,315 WBC/µL
B. 2,630 WBC/µL
C. Cannot report
D. 1,000 WBC/µL
Answer: C
Rationale: Cell counts from opposite sides of the hemacytometer that are
greater than 10% of one another are considered discrepant and should
not be used to calculate reportable results. This count should not be used
to report patient results.
10. The RBC inclusions shown in the photograph represent which of the
following?
A. Howell-Jolly bodies
B. Heinz bodies
C. Pappenheimer bodies
D. Basophilic stippling
Answer: A
Rationale: Howell-Jolly bodies are usually single, round, and positioned at
the periphery of the red blood cell. They are rarely found on a routine
peripheral blood smear, as they are usually removed by a functioning
spleen. They appear in megaloblastic anemias and after splenectomy.
11. Which of the following is a characteristic of Howell-Jolly bodies?
A. They are RNA remnants
