MMSC 438 – Advanced Clinical Laboratory Science Exam 2
Actual Exam – Hematology, Chemistry, Immunohematology
& Body Fluids | Complete Q&A & Detailed Rationales | Pass
Guaranteed - A+ Graded
Section 1: Hematology & Hemostasis
Q1: In a complete blood count, the mean corpuscular volume (MCV) represents which
of the following?
A. The average concentration of hemoglobin in red blood cells
B. The average size of red blood cells [CORRECT]
C. The total number of red blood cells per microliter
D. The variation in red blood cell diameter
Correct Answer: B
Rationale: The best answer is B. MCV stands for mean corpuscular volume, and it tells
you the average size of the red cells. It's one of the first numbers you look at when
classifying an anemia.
Q2: Which RBC index reflects the average amount of hemoglobin contained within each
individual red blood cell?
A. MCV
B. MCH [CORRECT]
C. MCHC
D. RDW
Correct Answer: B
Rationale: The best answer is B. MCH stands for mean corpuscular hemoglobin, and it
reflects the average amount of hemoglobin inside each individual red blood cell.
Q3: A 28-year-old woman presents with fatigue and pallor. Her CBC shows hemoglobin
9.8 g/dL, hematocrit 30%, MCV 70 fL, MCH 22 pg, and RDW 17%. Her ferritin is 8 ng/mL.
What is the most likely diagnosis?
A. Thalassemia trait
B. Iron deficiency anemia [CORRECT]
,C. Anemia of chronic disease
D. Sideroblastic anemia
Correct Answer: B
Rationale: The best answer is B. This is the classic picture of iron deficiency: microcytic,
hypochromic cells with a high RDW and low ferritin. The history of heavy menstrual
bleeding is also a major clue.
Q4: A 65-year-old man with a history of alcohol use disorder has a CBC showing
macrocytosis. His B12 and folate levels are pending. Which laboratory finding would
most support a diagnosis of folate deficiency rather than B12 deficiency?
A. Presence of neurologic symptoms like numbness and tingling
B. Normal methylmalonic acid with elevated homocysteine [CORRECT]
C. Elevated methylmalonic acid and normal homocysteine
D. Presence of anti-intrinsic factor antibodies
Correct Answer: B
Rationale: The best answer is B. Folate deficiency elevates homocysteine but leaves
methylmalonic acid normal, whereas B12 deficiency raises both. That's the key lab
distinction you need to remember.
Q5: A patient with rheumatoid arthritis has a CBC showing hemoglobin 10.2 g/dL, MCV
85 fL, normal RDW, ferritin 180 ng/mL, and low serum iron. What is the most likely
mechanism?
A. Absolute iron deficiency from chronic blood loss
B. Functional iron deficiency with iron trapped inside macrophages [CORRECT]
C. Hemolysis from autoimmune disease
D. Folate deficiency from methotrexate therapy
Correct Answer: B
Rationale: The best answer is B. In anemia of chronic disease, iron gets trapped inside
macrophages, so serum iron is low but ferritin is normal or elevated. The normocytic
indices and inflammatory history fit perfectly.
Q6: A peripheral blood smear review reveals hypersegmented neutrophils,
macro-ovalocytes, and pancytopenia. Which deficiency is most likely responsible?
A. Iron
B. Vitamin B12 or folate [CORRECT]
C. Vitamin B6
, D. Copper
Correct Answer: B
Rationale: The best answer is B. Hypersegmented neutrophils and macro-ovalocytes are
the classic peripheral smear findings in megaloblastic anemia from B12 or folate
deficiency.
Q7: A patient presents with petechiae and a platelet count of 18,000/μL. PT and PTT are
both normal, and the peripheral smear shows large platelets. What is the most likely
diagnosis?
A. Disseminated intravascular coagulation
B. Immune thrombocytopenic purpura [CORRECT]
C. Thrombotic thrombocytopenic purpura
D. Von Willebrand disease
Correct Answer: B
Rationale: The best answer is B. ITP is an immune-mediated destruction of platelets, so
you see isolated thrombocytopenia with normal coagulation studies and often larger
platelets on the smear.
Q8: Which coagulation factor is deficient in Hemophilia A?
A. Factor IX
B. Factor VIII [CORRECT]
C. Factor XI
D. Factor VII
Correct Answer: B
Rationale: The best answer is B. Hemophilia A is an X-linked deficiency of factor VIII. It
prolongs the PTT but leaves the PT and platelet count completely normal.
Q9: A patient has a prolonged activated partial thromboplastin time with a normal
prothrombin time and normal platelet count. A mixing study corrects the PTT to normal.
What does this pattern suggest?
A. Factor VII deficiency
B. An inhibitor to a factor in the intrinsic pathway
C. A deficiency in an intrinsic pathway factor [CORRECT]
D. Vitamin K deficiency
Correct Answer: C
Actual Exam – Hematology, Chemistry, Immunohematology
& Body Fluids | Complete Q&A & Detailed Rationales | Pass
Guaranteed - A+ Graded
Section 1: Hematology & Hemostasis
Q1: In a complete blood count, the mean corpuscular volume (MCV) represents which
of the following?
A. The average concentration of hemoglobin in red blood cells
B. The average size of red blood cells [CORRECT]
C. The total number of red blood cells per microliter
D. The variation in red blood cell diameter
Correct Answer: B
Rationale: The best answer is B. MCV stands for mean corpuscular volume, and it tells
you the average size of the red cells. It's one of the first numbers you look at when
classifying an anemia.
Q2: Which RBC index reflects the average amount of hemoglobin contained within each
individual red blood cell?
A. MCV
B. MCH [CORRECT]
C. MCHC
D. RDW
Correct Answer: B
Rationale: The best answer is B. MCH stands for mean corpuscular hemoglobin, and it
reflects the average amount of hemoglobin inside each individual red blood cell.
Q3: A 28-year-old woman presents with fatigue and pallor. Her CBC shows hemoglobin
9.8 g/dL, hematocrit 30%, MCV 70 fL, MCH 22 pg, and RDW 17%. Her ferritin is 8 ng/mL.
What is the most likely diagnosis?
A. Thalassemia trait
B. Iron deficiency anemia [CORRECT]
,C. Anemia of chronic disease
D. Sideroblastic anemia
Correct Answer: B
Rationale: The best answer is B. This is the classic picture of iron deficiency: microcytic,
hypochromic cells with a high RDW and low ferritin. The history of heavy menstrual
bleeding is also a major clue.
Q4: A 65-year-old man with a history of alcohol use disorder has a CBC showing
macrocytosis. His B12 and folate levels are pending. Which laboratory finding would
most support a diagnosis of folate deficiency rather than B12 deficiency?
A. Presence of neurologic symptoms like numbness and tingling
B. Normal methylmalonic acid with elevated homocysteine [CORRECT]
C. Elevated methylmalonic acid and normal homocysteine
D. Presence of anti-intrinsic factor antibodies
Correct Answer: B
Rationale: The best answer is B. Folate deficiency elevates homocysteine but leaves
methylmalonic acid normal, whereas B12 deficiency raises both. That's the key lab
distinction you need to remember.
Q5: A patient with rheumatoid arthritis has a CBC showing hemoglobin 10.2 g/dL, MCV
85 fL, normal RDW, ferritin 180 ng/mL, and low serum iron. What is the most likely
mechanism?
A. Absolute iron deficiency from chronic blood loss
B. Functional iron deficiency with iron trapped inside macrophages [CORRECT]
C. Hemolysis from autoimmune disease
D. Folate deficiency from methotrexate therapy
Correct Answer: B
Rationale: The best answer is B. In anemia of chronic disease, iron gets trapped inside
macrophages, so serum iron is low but ferritin is normal or elevated. The normocytic
indices and inflammatory history fit perfectly.
Q6: A peripheral blood smear review reveals hypersegmented neutrophils,
macro-ovalocytes, and pancytopenia. Which deficiency is most likely responsible?
A. Iron
B. Vitamin B12 or folate [CORRECT]
C. Vitamin B6
, D. Copper
Correct Answer: B
Rationale: The best answer is B. Hypersegmented neutrophils and macro-ovalocytes are
the classic peripheral smear findings in megaloblastic anemia from B12 or folate
deficiency.
Q7: A patient presents with petechiae and a platelet count of 18,000/μL. PT and PTT are
both normal, and the peripheral smear shows large platelets. What is the most likely
diagnosis?
A. Disseminated intravascular coagulation
B. Immune thrombocytopenic purpura [CORRECT]
C. Thrombotic thrombocytopenic purpura
D. Von Willebrand disease
Correct Answer: B
Rationale: The best answer is B. ITP is an immune-mediated destruction of platelets, so
you see isolated thrombocytopenia with normal coagulation studies and often larger
platelets on the smear.
Q8: Which coagulation factor is deficient in Hemophilia A?
A. Factor IX
B. Factor VIII [CORRECT]
C. Factor XI
D. Factor VII
Correct Answer: B
Rationale: The best answer is B. Hemophilia A is an X-linked deficiency of factor VIII. It
prolongs the PTT but leaves the PT and platelet count completely normal.
Q9: A patient has a prolonged activated partial thromboplastin time with a normal
prothrombin time and normal platelet count. A mixing study corrects the PTT to normal.
What does this pattern suggest?
A. Factor VII deficiency
B. An inhibitor to a factor in the intrinsic pathway
C. A deficiency in an intrinsic pathway factor [CORRECT]
D. Vitamin K deficiency
Correct Answer: C
