ASCP MLT – MEDICAL LABORATORY TECHNICIAN EXAM
| ALL QUESTIONS AND ANSWERS | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026/2027
1. A patient’s serum sample is visibly hemolyzed. Which laboratory result is most likely to
be falsely increased because of hemolysis?
A. Sodium
B. Potassium
C. Chloride
D. Calcium
Answer: B
Rationale: Hemolysis releases intracellular potassium from erythrocytes into serum, potentially
producing a falsely elevated potassium result.
2. A lavender-top tube arrives in hematology with the blood level significantly below the
required fill volume. What is the primary concern?
A. Excessive serum formation
B. Increased bilirubin concentration
C. Incorrect blood-to-anticoagulant ratio
D. Platelet activation caused by clotting
Answer: C
Rationale: EDTA tubes require an appropriate blood-to-anticoagulant ratio. Underfilling can
produce inaccurate hematologic results, particularly coagulation-related effects on cellular
measurements.
3. Which anticoagulant is routinely used for a complete blood count?
A. EDTA
B. Sodium citrate
C. Heparin
D. Sodium fluoride
Answer: A
Rationale: EDTA preserves cellular morphology and prevents coagulation by chelating calcium,
making it the standard anticoagulant for CBC testing.
4. A technologist observes numerous oval-shaped erythrocytes on a peripheral blood
smear. Which finding is most consistent with hereditary elliptocytosis?
A. Spherocytes
B. Target cells
,C. Schistocytes
D. Elliptocytes
Answer: D
Rationale: Hereditary elliptocytosis is characterized by increased numbers of elliptocytes or
ovalocytes on the peripheral smear.
5. A CBC demonstrates a hemoglobin of 8.2 g/dL, MCV of 68 fL, and decreased MCHC.
Which classification best describes the anemia?
A. Normocytic normochromic
B. Macrocytic hypochromic
C. Microcytic hypochromic
D. Macrocytic normochromic
Answer: C
Rationale: A low MCV indicates microcytosis, while decreased MCHC indicates hypochromia.
Iron deficiency anemia is a common cause.
6. Which leukocyte normally contains a multilobed nucleus and abundant pale cytoplasmic
granules?
A. Neutrophil
B. Lymphocyte
C. Monocyte
D. Basophil
Answer: A
Rationale: Mature neutrophils characteristically have segmented, multilobed nuclei and fine
cytoplasmic granules.
7. A peripheral smear shows large cells with abundant gray-blue cytoplasm and folded or
kidney-shaped nuclei. Which cell is most likely present?
A. Neutrophil
B. Monocyte
C. Eosinophil
D. Plasma cell
Answer: B
Rationale: Monocytes are the largest normal circulating leukocytes and typically have abundant
gray-blue cytoplasm with folded, indented, or kidney-shaped nuclei.
8. A patient has a markedly elevated eosinophil count. Which condition is most strongly
associated with this finding?
,A. Acute bacterial infection
B. Iron deficiency
C. Viral hepatitis
D. Parasitic infection
Answer: D
Rationale: Eosinophilia is commonly associated with tissue-invasive parasitic infections and
allergic disorders.
9. Which erythrocyte inclusion is composed primarily of denatured hemoglobin?
A. Howell-Jolly body
B. Pappenheimer body
C. Heinz body
D. Basophilic stippling
Answer: C
Rationale: Heinz bodies are aggregates of denatured hemoglobin that form under oxidative
stress and are best demonstrated with supravital staining.
10. A patient has an increased reticulocyte count after acute blood loss. What does this
finding indicate?
A. Increased bone marrow erythropoietic activity
B. Decreased erythropoietin production
C. Complete cessation of erythrocyte production
D. Reduced red cell destruction
Answer: A
Rationale: An increased reticulocyte count indicates that the bone marrow is responding by
increasing production and releasing immature erythrocytes.
11. Which stain is routinely used for differential evaluation of peripheral blood cell
morphology?
A. Gram stain
B. Wright-Giemsa stain
C. Ziehl-Neelsen stain
D. Prussian blue stain
Answer: B
Rationale: Wright-Giemsa staining provides appropriate nuclear and cytoplasmic detail for
peripheral blood differential evaluation.
, 12. A technologist needs to determine whether a patient has sufficient iron stores in the
bone marrow. Which stain is most appropriate?
A. Sudan Black B
B. Wright stain
C. New methylene blue
D. Prussian blue
Answer: D
Rationale: Prussian blue staining demonstrates iron deposits, including hemosiderin, in bone
marrow macrophages and erythroid precursors.
13. Which coagulation test is primarily used to monitor unfractionated heparin therapy?
A. PT
B. Fibrinogen
C. aPTT
D. D-dimer
Answer: C
Rationale: The activated partial thromboplastin time is commonly used to monitor
unfractionated heparin therapy, although anti-Xa testing may also be used.
14. A prolonged PT with a normal aPTT most strongly suggests an abnormality involving
which pathway?
A. Extrinsic pathway
B. Intrinsic pathway
C. Common pathway only
D. Fibrinolytic pathway
Answer: A
Rationale: PT primarily evaluates the extrinsic and common coagulation pathways and is
particularly sensitive to factor VII.
15. Which coagulation factor is directly converted into fibrin during the final stage of
coagulation?
A. Factor II
B. Factor V
C. Factor VIII
D. Factor I
Answer: D
Rationale: Thrombin converts fibrinogen, also known as factor I, into insoluble fibrin strands.
| ALL QUESTIONS AND ANSWERS | A+ GRADED |
COMPREHENSIVE EXAM GUIDE 2026/2027
1. A patient’s serum sample is visibly hemolyzed. Which laboratory result is most likely to
be falsely increased because of hemolysis?
A. Sodium
B. Potassium
C. Chloride
D. Calcium
Answer: B
Rationale: Hemolysis releases intracellular potassium from erythrocytes into serum, potentially
producing a falsely elevated potassium result.
2. A lavender-top tube arrives in hematology with the blood level significantly below the
required fill volume. What is the primary concern?
A. Excessive serum formation
B. Increased bilirubin concentration
C. Incorrect blood-to-anticoagulant ratio
D. Platelet activation caused by clotting
Answer: C
Rationale: EDTA tubes require an appropriate blood-to-anticoagulant ratio. Underfilling can
produce inaccurate hematologic results, particularly coagulation-related effects on cellular
measurements.
3. Which anticoagulant is routinely used for a complete blood count?
A. EDTA
B. Sodium citrate
C. Heparin
D. Sodium fluoride
Answer: A
Rationale: EDTA preserves cellular morphology and prevents coagulation by chelating calcium,
making it the standard anticoagulant for CBC testing.
4. A technologist observes numerous oval-shaped erythrocytes on a peripheral blood
smear. Which finding is most consistent with hereditary elliptocytosis?
A. Spherocytes
B. Target cells
,C. Schistocytes
D. Elliptocytes
Answer: D
Rationale: Hereditary elliptocytosis is characterized by increased numbers of elliptocytes or
ovalocytes on the peripheral smear.
5. A CBC demonstrates a hemoglobin of 8.2 g/dL, MCV of 68 fL, and decreased MCHC.
Which classification best describes the anemia?
A. Normocytic normochromic
B. Macrocytic hypochromic
C. Microcytic hypochromic
D. Macrocytic normochromic
Answer: C
Rationale: A low MCV indicates microcytosis, while decreased MCHC indicates hypochromia.
Iron deficiency anemia is a common cause.
6. Which leukocyte normally contains a multilobed nucleus and abundant pale cytoplasmic
granules?
A. Neutrophil
B. Lymphocyte
C. Monocyte
D. Basophil
Answer: A
Rationale: Mature neutrophils characteristically have segmented, multilobed nuclei and fine
cytoplasmic granules.
7. A peripheral smear shows large cells with abundant gray-blue cytoplasm and folded or
kidney-shaped nuclei. Which cell is most likely present?
A. Neutrophil
B. Monocyte
C. Eosinophil
D. Plasma cell
Answer: B
Rationale: Monocytes are the largest normal circulating leukocytes and typically have abundant
gray-blue cytoplasm with folded, indented, or kidney-shaped nuclei.
8. A patient has a markedly elevated eosinophil count. Which condition is most strongly
associated with this finding?
,A. Acute bacterial infection
B. Iron deficiency
C. Viral hepatitis
D. Parasitic infection
Answer: D
Rationale: Eosinophilia is commonly associated with tissue-invasive parasitic infections and
allergic disorders.
9. Which erythrocyte inclusion is composed primarily of denatured hemoglobin?
A. Howell-Jolly body
B. Pappenheimer body
C. Heinz body
D. Basophilic stippling
Answer: C
Rationale: Heinz bodies are aggregates of denatured hemoglobin that form under oxidative
stress and are best demonstrated with supravital staining.
10. A patient has an increased reticulocyte count after acute blood loss. What does this
finding indicate?
A. Increased bone marrow erythropoietic activity
B. Decreased erythropoietin production
C. Complete cessation of erythrocyte production
D. Reduced red cell destruction
Answer: A
Rationale: An increased reticulocyte count indicates that the bone marrow is responding by
increasing production and releasing immature erythrocytes.
11. Which stain is routinely used for differential evaluation of peripheral blood cell
morphology?
A. Gram stain
B. Wright-Giemsa stain
C. Ziehl-Neelsen stain
D. Prussian blue stain
Answer: B
Rationale: Wright-Giemsa staining provides appropriate nuclear and cytoplasmic detail for
peripheral blood differential evaluation.
, 12. A technologist needs to determine whether a patient has sufficient iron stores in the
bone marrow. Which stain is most appropriate?
A. Sudan Black B
B. Wright stain
C. New methylene blue
D. Prussian blue
Answer: D
Rationale: Prussian blue staining demonstrates iron deposits, including hemosiderin, in bone
marrow macrophages and erythroid precursors.
13. Which coagulation test is primarily used to monitor unfractionated heparin therapy?
A. PT
B. Fibrinogen
C. aPTT
D. D-dimer
Answer: C
Rationale: The activated partial thromboplastin time is commonly used to monitor
unfractionated heparin therapy, although anti-Xa testing may also be used.
14. A prolonged PT with a normal aPTT most strongly suggests an abnormality involving
which pathway?
A. Extrinsic pathway
B. Intrinsic pathway
C. Common pathway only
D. Fibrinolytic pathway
Answer: A
Rationale: PT primarily evaluates the extrinsic and common coagulation pathways and is
particularly sensitive to factor VII.
15. Which coagulation factor is directly converted into fibrin during the final stage of
coagulation?
A. Factor II
B. Factor V
C. Factor VIII
D. Factor I
Answer: D
Rationale: Thrombin converts fibrinogen, also known as factor I, into insoluble fibrin strands.
