2026 SH Exam Prep: Specialist in
Hematology Practice Questions, Answer
Rationales, Blood Cell Morphology,
Coagulation, Laboratory Testing & Quality
Assurance Study Guide
Domain 1: Hematology Physiology & Hematopoiesis (Questions 1–25)
Question 1. Which growth factor is the primary regulator of erythropoiesis?
A) Thrombopoietin (TPO)
B) Erythropoietin (EPO)
C) Granulocyte colony-stimulating factor (G-CSF)
D) Interleukin-3 (IL-3)
Rationale: Erythropoietin (EPO) is produced primarily by the peritubular cells of
the kidney in response to hypoxia and is the principal growth factor driving red
blood cell production. EPO binds to receptors on erythroid progenitor cells in the
bone marrow, promoting their proliferation, differentiation, and survival.
Question 2. During normal hematopoiesis, the pluripotent hematopoietic stem cell
first differentiates into which two major progenitor lineages?
A) Myeloid and erythroid
B) Lymphoid and myeloid
C) Erythroid and megakaryocytic
D) Granulocytic and monocytic
Rationale: The pluripotent hematopoietic stem cell gives rise to two major
progenitor lineages: the common myeloid progenitor (CMP) and the common
lymphoid progenitor (CLP). The myeloid lineage further differentiates into
erythrocytes, megakaryocytes, granulocytes, and monocytes, while the lymphoid
lineage produces T cells, B cells, and NK cells.
,Question 3. The primary site of hematopoiesis in a healthy adult is the:
A) Liver
B) Spleen
C) Bone marrow of the axial skeleton
D) Thymus
Rationale: In healthy adults, the bone marrow of the axial skeleton (vertebrae,
sternum, ribs, pelvis, and skull) is the primary site of hematopoiesis. The liver and
spleen serve as sites of hematopoiesis during fetal development but do not
normally produce blood cells in adults unless extramedullary hematopoiesis occurs
in pathologic states.
Question 4. What is the average lifespan of a circulating erythrocyte?
A) 30 days
B) 60 days
C) 120 days
D) 180 days
Rationale: The average lifespan of a circulating erythrocyte is approximately 120
days. Senescent red cells are removed by macrophages in the spleen, liver, and
bone marrow.
Question 5. Which of the following is the most abundant protein in the erythrocyte
membrane cytoskeleton?
A) Spectrin
B) Actin
C) Ankyrin
D) Band 3
Rationale: Spectrin is the most abundant protein in the erythrocyte membrane
cytoskeleton, forming a lattice that provides deformability and mechanical stability
to the red cell membrane. Deficiencies in spectrin lead to hereditary spherocytosis.
Question 6. Which hemoglobin is the predominant type in a healthy adult?
,A) HbF
B) HbA2
C) HbA
D) HbH
Rationale: HbA (α₂β₂) is the predominant hemoglobin in healthy adults,
comprising approximately 96–98% of total hemoglobin. HbA2 (α₂δ₂) accounts for
2–3%, and HbF (α₂γ₂) is <1%.
Question 7. What is the primary function of neutrophils?
A) Phagocytosis and killing of bacteria
B) Antibody production
C) Allergic reactions
D) Parasite killing
Rationale: Neutrophils are the primary phagocytic cells involved in the innate
immune response against bacterial and fungal infections. They migrate to sites of
infection, engulf pathogens, and kill them through oxidative burst and
degranulation.
Question 8. Which cytokine is the primary regulator of platelet production?
A) EPO
B) G-CSF
C) Thrombopoietin (TPO)
D) GM-CSF
Rationale: Thrombopoietin (TPO) is the primary regulator of megakaryopoiesis
and platelet production. It is produced primarily by the liver and binds to the c-Mpl
receptor on megakaryocytes.
Question 9. Where does T-cell maturation primarily occur?
A) Bone marrow
B) Thymus
, C) Spleen
D) Lymph nodes
Rationale: T-cell maturation primarily occurs in the thymus, where T-cell
precursors undergo positive and negative selection to ensure self-tolerance and
MHC restriction.
Question 10. Which of the following is a function of the spleen?
A) Filtration of blood and removal of senescent RBCs
B) Production of bile
C) T-cell maturation
D) Production of erythropoietin
Rationale: The spleen filters blood, removes senescent or damaged red blood
cells, and serves as a site of immune surveillance. It also acts as a reservoir for
platelets and monocytes.
Question 11. Which iron storage protein is found in the liver, spleen, and bone
marrow?
A) Transferrin
B) Ferritin
C) Hemosiderin
D) Ceruloplasmin
Rationale: Ferritin is the primary iron storage protein found in the liver, spleen,
bone marrow, and skeletal muscle. It stores iron in a soluble, non-toxic form and
releases it when needed.
Question 12. What is the function of transferrin?
A) Transport of iron in plasma
B) Storage of iron
C) Oxygen transport
D) Copper metabolism
Hematology Practice Questions, Answer
Rationales, Blood Cell Morphology,
Coagulation, Laboratory Testing & Quality
Assurance Study Guide
Domain 1: Hematology Physiology & Hematopoiesis (Questions 1–25)
Question 1. Which growth factor is the primary regulator of erythropoiesis?
A) Thrombopoietin (TPO)
B) Erythropoietin (EPO)
C) Granulocyte colony-stimulating factor (G-CSF)
D) Interleukin-3 (IL-3)
Rationale: Erythropoietin (EPO) is produced primarily by the peritubular cells of
the kidney in response to hypoxia and is the principal growth factor driving red
blood cell production. EPO binds to receptors on erythroid progenitor cells in the
bone marrow, promoting their proliferation, differentiation, and survival.
Question 2. During normal hematopoiesis, the pluripotent hematopoietic stem cell
first differentiates into which two major progenitor lineages?
A) Myeloid and erythroid
B) Lymphoid and myeloid
C) Erythroid and megakaryocytic
D) Granulocytic and monocytic
Rationale: The pluripotent hematopoietic stem cell gives rise to two major
progenitor lineages: the common myeloid progenitor (CMP) and the common
lymphoid progenitor (CLP). The myeloid lineage further differentiates into
erythrocytes, megakaryocytes, granulocytes, and monocytes, while the lymphoid
lineage produces T cells, B cells, and NK cells.
,Question 3. The primary site of hematopoiesis in a healthy adult is the:
A) Liver
B) Spleen
C) Bone marrow of the axial skeleton
D) Thymus
Rationale: In healthy adults, the bone marrow of the axial skeleton (vertebrae,
sternum, ribs, pelvis, and skull) is the primary site of hematopoiesis. The liver and
spleen serve as sites of hematopoiesis during fetal development but do not
normally produce blood cells in adults unless extramedullary hematopoiesis occurs
in pathologic states.
Question 4. What is the average lifespan of a circulating erythrocyte?
A) 30 days
B) 60 days
C) 120 days
D) 180 days
Rationale: The average lifespan of a circulating erythrocyte is approximately 120
days. Senescent red cells are removed by macrophages in the spleen, liver, and
bone marrow.
Question 5. Which of the following is the most abundant protein in the erythrocyte
membrane cytoskeleton?
A) Spectrin
B) Actin
C) Ankyrin
D) Band 3
Rationale: Spectrin is the most abundant protein in the erythrocyte membrane
cytoskeleton, forming a lattice that provides deformability and mechanical stability
to the red cell membrane. Deficiencies in spectrin lead to hereditary spherocytosis.
Question 6. Which hemoglobin is the predominant type in a healthy adult?
,A) HbF
B) HbA2
C) HbA
D) HbH
Rationale: HbA (α₂β₂) is the predominant hemoglobin in healthy adults,
comprising approximately 96–98% of total hemoglobin. HbA2 (α₂δ₂) accounts for
2–3%, and HbF (α₂γ₂) is <1%.
Question 7. What is the primary function of neutrophils?
A) Phagocytosis and killing of bacteria
B) Antibody production
C) Allergic reactions
D) Parasite killing
Rationale: Neutrophils are the primary phagocytic cells involved in the innate
immune response against bacterial and fungal infections. They migrate to sites of
infection, engulf pathogens, and kill them through oxidative burst and
degranulation.
Question 8. Which cytokine is the primary regulator of platelet production?
A) EPO
B) G-CSF
C) Thrombopoietin (TPO)
D) GM-CSF
Rationale: Thrombopoietin (TPO) is the primary regulator of megakaryopoiesis
and platelet production. It is produced primarily by the liver and binds to the c-Mpl
receptor on megakaryocytes.
Question 9. Where does T-cell maturation primarily occur?
A) Bone marrow
B) Thymus
, C) Spleen
D) Lymph nodes
Rationale: T-cell maturation primarily occurs in the thymus, where T-cell
precursors undergo positive and negative selection to ensure self-tolerance and
MHC restriction.
Question 10. Which of the following is a function of the spleen?
A) Filtration of blood and removal of senescent RBCs
B) Production of bile
C) T-cell maturation
D) Production of erythropoietin
Rationale: The spleen filters blood, removes senescent or damaged red blood
cells, and serves as a site of immune surveillance. It also acts as a reservoir for
platelets and monocytes.
Question 11. Which iron storage protein is found in the liver, spleen, and bone
marrow?
A) Transferrin
B) Ferritin
C) Hemosiderin
D) Ceruloplasmin
Rationale: Ferritin is the primary iron storage protein found in the liver, spleen,
bone marrow, and skeletal muscle. It stores iron in a soluble, non-toxic form and
releases it when needed.
Question 12. What is the function of transferrin?
A) Transport of iron in plasma
B) Storage of iron
C) Oxygen transport
D) Copper metabolism
