Hematology Practice Questions

Q: In chronic myeloid leukemia (CML), what is the serum vitamin B12 level?

Increased. ***Increased*** - In **CML**, there is an overproduction of **granulocytes**, which contain **transcobalamin I**, a protein that binds to and transports vitamin B12. - The elevated number of these cells leads to an increase in serum **transcobalamin I**, resulting in higher measured **serum vitamin B12 levels**, even though the biologically active free B12 might not be as high. *Slightly decreased* - This is an unlikely finding in **CML**; conditions like **pernicious anemia** or **malabsorption syndromes** are more typically associated with decreased B12. [1] - A slight decrease would not reflect the underlying proliferative process characteristic of **CML**. *Normal* - While vitamin B12 deficiency is common, a normal level would not align with the typical hematological changes seen in **CML**, where granulocyte proliferation affects vitamin B12 binding proteins. - A normal B12 level would not be a diagnostic indicator in the context of suspected **CML**. *Markedly decreased* - A markedly decreased vitamin B12 level is highly characteristic of conditions such as **pernicious anemia**, **vegan diet without supplementation**, or severe **malabsorption**, not **CML**. [1] - **CML** is associated with an overproduction of **white blood cells**, which usually leads to an *increase* in B12 binding proteins, thus elevating serum B12 levels.

Q: Which of the following statements regarding G6PD deficiency are true? 1) It is an X-linked recessive disorder, 2) Bite cells are present in the blood smear, 3) It protects against kala-azar, 4) Enzyme levels are not directly proportional to the age of red blood cells, 5) There is a male predilection.

2 and 5. **2 and 5** - **Bite cells** (or degmacytes) are characteristic of G6PD deficiency, forming when macrophages remove membrane-bound denatured hemoglobin (Heinz bodies) from red blood cells. [2] - The disorder exhibits a **male predilection** because it is an **X-linked recessive genetic condition** [2], meaning males (XY) are affected with a single defective gene copy, whereas females (XX) usually need two defective copies to express the disease fully. *1 and 2* - While **bite cells** are indeed present in G6PD deficiency and it is an **X-linked recessive disorder** [2], this option is incomplete as it misses other true statements. - The statement that **enzyme levels are not directly proportional to the age of red blood cells** is incorrect; G6PD activity normally declines as red blood cells age. *1 and 3* - **G6PD deficiency is an X-linked recessive disorder** [2], but it provides protection against **malaria** [1], not kala-azar (leishmaniasis). - Protection against kala-azar is more commonly associated with other genetic conditions, not G6PD deficiency. *1, 2, 4, and 5* - While **G6PD deficiency is an X-linked recessive disorder** [2], **bite cells** are present, and there is a **male predilection**, statement 4 is incorrect. - **G6PD enzyme levels are directly proportional to the age of red blood cells**; older red blood cells have less enzyme activity, making them more susceptible to oxidative stress, which explains statement 4 is actually false.

Q: A 29-year-old woman was found to have a hemoglobin level of 7.8 mg/dl, with a reticulocyte count of 0.8%. The peripheral blood smear showed microcytic hypochromic anemia. On high-performance liquid chromatography (HPLC), hemoglobin A2 and hemoglobin F were 2.4% and 1.3%, respectively. The serum iron and total iron-binding capacity (TIBC) were 15 mg/dl and 420 micrograms per deciliter, respectively. What is the most likely cause of anemia in this patient?

Iron deficiency anemia. ### Iron deficiency anemia - The **low serum iron** level (15 mg/dl) and **high TIBC** (420 micrograms/dl) are classic indicators of iron deficiency. - Microcytic hypochromic anemia with a low reticulocyte count further supports this diagnosis, indicating insufficient **iron** for erythropoiesis [1]. [2] ### Beta thalassemia minor - Typically presents with **normal serum iron** levels, which is not consistent with the low iron levels seen here. - HPLC would show elevated hemoglobin A2, which is **not observed** in this patient's results. ### Sideroblastic anemia - Characterized by the presence of **ringed sideroblasts** in the bone marrow and often has normal or increased serum iron levels. - The iron levels reported here do not align with what is expected in sideroblastic anemia. ### Anemia due to chronic infection - Often associated with normocytic or mild microcytic anemia but does not typically lead to such **low serum iron** levels with high TIBC [1]. - This type typically presents with **inflammatory markers** and altered iron metabolism different from the findings in this case.

Q: A patient has just been admitted to the hospital for observation. Based on the patient's laboratory results, which indicate a hematocrit of 45%, hemoglobin of 16 g/dL, and platelets of 50 × 10^9/L, what is the most likely primary problem?

Immune Thrombocytopenic Purpura (ITP). ***Recurrent nose bleeds*** - The combination of a **hemoglobin level of 16 g/dL** and **platelet count of 50 × 10^9/L** suggests a thrombocytopenic disorder, which can lead to easy bruising and **epistaxis (nose bleeds)** [1]. - The decreased platelet count is significant, as it can cause bleeding tendencies [1], aligning with the presentation of recurrent nose bleeds [1]. *Hemochromatosis* - Typically associated with **elevated iron levels** and may lead to symptoms like fatigue and joint pain, not primarily affecting platelet count. - Hemoglobin and hematocrit levels are usually normal in hemochromatosis unless secondary complications arise. *Deep vein thrombosis* - Presents with localized swelling, pain, and tenderness in the affected limb, not associated with isolated thrombocytopenia. - Laboratory findings may show changes in coagulation but not specifically low platelet counts. *Hepatic vein thrombosis* - Known as Budd-Chiari syndrome, characterized by abdominal pain, ascites, and liver dysfunction, typically not focused on low platelet count alone. - Although it can cause complications in blood flow, it does not directly correlate with recurrent nose bleeds as a primary symptom.

Q: The drug of choice for chronic myeloid leukemia (CML) is:

Imatinib. ***Imatinib*** - **Imatinib** is a **tyrosine kinase inhibitor (TKI)** that specifically targets the **BCR-ABL fusion protein**, which is the hallmark of **chronic myeloid leukemia (CML)** [1], [2]. - Its high specificity and effectiveness in inhibiting the proliferation of CML cells make it the **first-line therapy** and drug of choice for this condition [2]. *Cisplatin* - **Cisplatin** is a **platinum-based chemotherapy agent** commonly used in the treatment of various solid tumors, such as lung, ovarian, and testicular cancers. - It works by forming **DNA adducts**, leading to cell death, but it is not a targeted therapy for CML. *Methotrexate* - **Methotrexate** is an **antimetabolite** that inhibits **folate reductase**, used in the treatment of certain cancers (e.g., leukemia, lymphoma), autoimmune diseases (e.g., rheumatoid arthritis), and ectopic pregnancy. - While used in some leukemias, it is **not the primary treatment for CML**, which requires targeted therapy against the BCR-ABL protein. *Tamoxifen* - **Tamoxifen** is a **selective estrogen receptor modulator (SERM)** used primarily in the treatment and prevention of **estrogen receptor-positive breast cancer**. - It works by blocking estrogen's effects on breast cancer cells and has no role in the treatment of chronic myeloid leukemia.

Q: What is the most likely diagnosis for a 60-year-old man presenting with multiple punched-out lesions on imaging?

Multiple myeloma. ***Multiple myeloma*** - The presence of **multiple punched-out lesions** on imaging is a classic radiographic finding in multiple myeloma, caused by osteolytic bone destruction [1]. - Affects primarily older individuals, making a 60-year-old man a typical demographic [1]. *Eosinophilic granuloma* - More commonly presents as a **solitary bone lesion** and is typically seen in **children or young adults**. - While it can cause lytic lesions, the **multiplicity** described in an older patient makes it less likely than multiple myeloma. *Hyperparathyroidism* - Can cause bone resorption leading to **osteopenia** or **subperiosteal bone erosions**, especially in areas like the phalanges, but not typically "punched-out" lytic lesions. - Bone lesions in hyperparathyroidism are often referred to as **brown tumors**, which are distinct from the sharp, lytic lesions of multiple myeloma. *Acromegaly* - Characterized by **excess growth hormone**, leading to increased bone density and periosteal new bone formation. - It does not cause **punched-out lytic lesions**; rather, bone changes are typically proliferative.

Q: Which of the following is the most important diagnostic investigation for multiple myeloma?

Serum electrophoresis. ### Serum electrophoresis - **Serum protein electrophoresis** (SPEP) is crucial for detecting and quantifying the **monoclonal paraprotein (M-protein)** in the blood, which is characteristic of multiple myeloma [1]. - The presence of a **gamma globulin spike** or **M-spike** on SPEP is a hallmark of the disease [1]. *Lytic bone lesions* - While **lytic bone lesions** are a common and important feature of multiple myeloma, they are a consequence of the disease process rather than the primary diagnostic investigation itself [1]. - Imaging studies like X-rays or MRI are used to detect these lesions, but their presence alone is not sufficient for diagnosis without identification of the M-protein [1]. *Bence jones proteins* - **Bence Jones proteins** are **monoclonal light chains** found in the urine, indicating their presence in the blood. - While important for diagnosis and prognosis, SPEP is generally considered more central as it directly identifies the **monoclonal gammopathy** (M-protein) derived from plasma cells in the serum [1]. *Alkaline Phosphatase* - **Alkaline phosphatase** levels are typically **normal** in multiple myeloma, even in the presence of extensive bone disease. - This is because the lytic lesions in multiple myeloma result from osteoclast activation rather than osteoblastic activity, which would otherwise elevate alkaline phosphatase.

Q: Which of the following is the most critical feature of acute hemolytic reactions?

Intravascular hemolysis. ***Associated with fever, chills and rigors*** - In acute hemolytic reactions, fever, chills, and rigors are common clinical manifestations but may not always be present as described; therefore, the statement is false. [1] - These symptoms are more classically associated with **febrile non-hemolytic transfusion reactions**, not specifically acute hemolytic reactions. *Intravascular haemolysis* - Intravascular hemolysis is a hallmark of acute hemolytic reactions, occurring when transfusions are mismatched [2]. - It leads to the rapid destruction of RBCs, often resulting in decreased haptoglobin and increased free hemoglobin. *Complement mediated* - Acute hemolytic reactions are primarily mediated by the **complement system**, leading to lysis of RBCs [2]. - The activation of complement components plays a crucial role in the destruction of transfused red blood cells. *Multi organ failure* - Multi-organ failure can occur due to severe hemolysis but is not a direct characteristic of all acute hemolytic reactions. - It usually results from extensive hemolysis leading to **shock** or disseminated intravascular coagulation (DIC) in severe cases.

Q: The Schilling test is primarily used to assess which of the following?

Vitamin B12 absorption due to intrinsic factor deficiency. The Schilling test is primarily used to assess which of the following? ***Presence of intrinsic factor*** - The Schilling test specifically assesses the **absorption of vitamin B12** and evaluates the **presence of intrinsic factor**, which is critical for vitamin B12 absorption in the intestines [1]. - A low absorption level associated with a deficiency of intrinsic factor indicates **pernicious anemia** [2]. *Deficiency of riboflavin* - Riboflavin deficiency is diagnosed through clinical symptoms or assays of **riboflavin levels**, not with the Schilling test. - Clinical features may include **angular stomatitis** and **cheilosis**, which are unrelated to vitamin B12 absorption. *Excretion of folic acid* - The Schilling test does not evaluate **folic acid metabolism** or its excretion; it is focused solely on **vitamin B12 absorption** [1]. - Folate deficiency affects different pathways and can be assessed through serum **folate levels** instead [3]. *Capillary fragility* - Capillary fragility relates to vascular abnormalities and does not pertain to **vitamin B12 absorption** or intrinsic factors. - Conditions like **scurvy** or **vitamin C** deficiency cause capillary fragility, which are not assessed by the Schilling test.

Q: What is the appropriate treatment for megaloblastic anemia with neurological symptoms?

Folic acid with Hydroxycobalamin. Folic acid with Hydroxycobalamin - Neurological symptoms in megaloblastic anemia strongly suggest vitamin B12 deficiency, as folic acid alone can mask this deficiency and worsen neurological sequelae [3]. - Hydroxycobalamin is the preferred treatment for vitamin B12 deficiency, while folic acid addresses the megaloblastic hematopoiesis. Iron supplementation - This is used to treat iron deficiency anemia, which presents with microcytic or normocytic red blood cells, not megaloblastic changes [1]. - Iron supplementation would not address the neurological symptoms or the underlying B12 or folate deficiency. Vitamin B1 supplementation - Vitamin B1 (thiamine) deficiency is associated with conditions like beriberi and Wernicke-Korsakoff syndrome, characterized by neurological symptoms, but not megaloblastic anemia [4]. - Supplementation would not correct the underlying hematological abnormality or the specific neurological symptoms of B12 deficiency [4]. Folic Acid only - While folic acid is essential for DNA synthesis and would improve the hematological parameters of megaloblastic anemia, it does not treat vitamin B12 deficiency [2]. - Giving folic acid alone in the presence of B12 deficiency can lead to a worsening of neurological symptoms as it can correct the anemia but allow the neurological damage to progress [3].

Question 1

In chronic myeloid leukemia (CML), what is the serum vitamin B12 level?

Accepted Answer

Increased

Answer

Slightly decreased

Answer

Normal

Answer

Markedly decreased

Question 2

Which of the following statements regarding G6PD deficiency are true? 1) It is an X-linked recessive disorder, 2) Bite cells are present in the blood smear, 3) It protects against kala-azar, 4) Enzyme levels are not directly proportional to the age of red blood cells, 5) There is a male predilection.

Accepted Answer

2 and 5

Answer

1 and 2

Answer

1 and 3

Answer

1, 2, 4, and 5

Question 3

A 29-year-old woman was found to have a hemoglobin level of 7.8 mg/dl, with a reticulocyte count of 0.8%. The peripheral blood smear showed microcytic hypochromic anemia. On high-performance liquid chromatography (HPLC), hemoglobin A2 and hemoglobin F were 2.4% and 1.3%, respectively. The serum iron and total iron-binding capacity (TIBC) were 15 mg/dl and 420 micrograms per deciliter, respectively. What is the most likely cause of anemia in this patient?

Accepted Answer

Iron deficiency anemia

Answer

Beta thalassemia minor

Answer

Sideroblastic anemia

Answer

Anemia due to chronic infection

Question 4

A patient has just been admitted to the hospital for observation. Based on the patient's laboratory results, which indicate a hematocrit of 45%, hemoglobin of 16 g/dL, and platelets of 50 × 10^9/L, what is the most likely primary problem?

Accepted Answer

Immune Thrombocytopenic Purpura (ITP)

Answer

Hypersplenism

Answer

Aplastic anemia

Answer

Acute leukemia

Question 5

The drug of choice for chronic myeloid leukemia (CML) is:

Accepted Answer

Imatinib

Answer

Methotrexate

Answer

Cisplatin

Answer

Tamoxifen

Question 6

What is the most likely diagnosis for a 60-year-old man presenting with multiple punched-out lesions on imaging?

Accepted Answer

Multiple myeloma

Answer

Eosinophilic granuloma

Answer

Hyperparathyroidism

Answer

Acromegaly

Question 7

Which of the following is the most important diagnostic investigation for multiple myeloma?

Accepted Answer

Serum electrophoresis

Answer

Lytic bone lesions

Answer

Bence jones proteins

Answer

Alkaline Phosphatase

Question 8

Which of the following is the most critical feature of acute hemolytic reactions?

Accepted Answer

Intravascular hemolysis

Answer

Multi organ failure

Answer

Complement-mediated hemolysis

Answer

Fever, chills, and rigors

Question 9

The Schilling test is primarily used to assess which of the following?

Accepted Answer

Vitamin B12 absorption due to intrinsic factor deficiency

Answer

Vitamin B12 deficiency due to dietary insufficiency

Answer

Absorption issues related to pancreatic function

Answer

Malabsorption of vitamin B12 due to intestinal issues

Question 10

What is the appropriate treatment for megaloblastic anemia with neurological symptoms?

Accepted Answer

Folic acid with Hydroxycobalamin

Answer

Iron supplementation

Answer

Vitamin B1 supplementation

Answer

Folic Acid only

Hematology — MCQs

Hematology — MCQs

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