Hematology Practice Questions

Q: Which of the following is a typical cause of unconjugated hyperbilirubinemia?

Gilbert syndrome. Gilbert syndrome - This is a common, benign genetic condition characterized by a reduced activity of UDP-glucuronosyltransferase (UGT1A1), the enzyme responsible for conjugating bilirubin [1]. - The reduced enzyme activity leads to intermittent, mild unconjugated hyperbilirubinemia, typically exacerbated by stress, fasting, or illness, without significant liver disease [1]. *Hemolytic anemia* - Hemolytic anemia is characterized by an increased breakdown of red blood cells, leading to overproduction of unconjugated bilirubin [2, 3]. - While it causes unconjugated hyperbilirubinemia, it's due to excess bilirubin production overwhelming the liver's conjugating capacity, rather than a primary defect in conjugation like Gilbert syndrome [2]. *Crigler-Najjar syndrome* - This is a rare, severe genetic disorder involving a more profound deficiency or absence of the UGT1A1 enzyme, leading to significant and often life-threatening unconjugated hyperbilirubinemia [1]. - Unlike Gilbert syndrome, Crigler-Najjar syndrome typically presents with severe jaundice in infancy and can lead to kernicterus [1]. *Dubin-Johnson syndrome* - This is a rare, autosomal recessive disorder characterized by a defect in the MRP2 transporter protein, which is responsible for the excretion of conjugated bilirubin into the bile. - This condition primarily causes conjugated hyperbilirubinemia and is associated with a distinctive darkly pigmented liver on biopsy [2].

Q: Which of the following statements is MOST accurate regarding cyanosis in methemoglobinemia?

Does not improve with supplemental oxygen. ***Does not improve with supplemental oxygen*** - In **methemoglobinemia**, the iron in hemoglobin is oxidized from the ferrous (Fe2+) to the ferric (Fe3+) state, making it unable to bind oxygen. [1] - Therefore, despite supplemental oxygen, the **abnormal methemoglobin** cannot carry more oxygen, leading to persistent cyanosis. *Always associated with tachycardia* - While methemoglobinemia can cause **hypoxia** and compensatory **tachycardia**, it is not *always* present, especially in mild cases or if other coexisting conditions blunt the response. - The primary mechanism of cyanosis is the presence of **deoxygenated methemoglobin**, not solely the body's compensatory responses. [1] *Caused by increased carboxyhemoglobin levels* - **Carboxyhemoglobinemia** is caused by carbon monoxide poisoning, where carbon monoxide binds to hemoglobin with high affinity, preventing oxygen transport. - Methemoglobinemia is a distinct condition involving the **oxidation of iron** in hemoglobin to the ferric state. *Can occur in both congenital and acquired forms of the disease.* - This statement is generally true about methemoglobinemia itself (it can be congenital or acquired), but it doesn't directly explain the **characteristic cyanosis** and its resistance to oxygen. [1] - The question asks what is *most accurate regarding cyanosis* in the context of methemoglobinemia, focusing on the physiological manifestation rather than the disease etiology.

Q: A 60-year-old man presents with fatigue, dark urine, and jaundice. He has a history of rheumatoid arthritis and is on methotrexate. His laboratory tests show hemolytic anemia. What is the most likely cause?

Autoimmune hemolytic anemia due to rheumatoid arthritis. ***Autoimmune hemolytic anemia due to rheumatoid arthritis*** - **Rheumatoid arthritis** is an autoimmune disease, and patients with autoimmune conditions are at increased risk for other autoimmune phenomena, including **autoimmune hemolytic anemia (AIHA)** [1]. - The symptoms of **fatigue**, **dark urine (hemoglobinuria)**, and **jaundice** are classic presentations of hemolytic anemia, indicating increased red blood cell destruction. *Methotrexate-induced hemolysis* - While methotrexate is a known immunosuppressant used in rheumatoid arthritis, **drug-induced hemolytic anemia** is a rare side effect, and it often presents with different mechanisms than the autoimmune type. - There is no direct evidence here to suggest a drug-specific reaction over a more common autoimmune association with the underlying disease. *G6PD deficiency after oxidative stress* - **G6PD deficiency** typically causes acute hemolytic episodes triggered by specific **oxidative stressors** like certain drugs (e.g., antimalarials, sulfonamides), infections, or fava beans [2]. - Although methotrexate can cause some oxidative stress, **G6PD deficiency** is usually identified earlier in life or through specific triggers not clearly mentioned here [2]. *Paroxysmal nocturnal hemoglobinuria with hemoglobinuria* - **Paroxysmal nocturnal hemoglobinuria (PNH)** is a rare, acquired clonal disorder resulting in complement-mediated hemolysis, characterized by recurrent episodes of **dark urine, especially in the morning**. - While presenting with dark urine, PNH is typically associated with **thrombosis** and **bone marrow failure**, and is not directly linked to rheumatoid arthritis in this manner.

Q: A 65-year-old man presents with fatigue, pallor, and dyspnea on exertion. Laboratory tests show a hemoglobin level of 8 g/dL, an MCV of 72 fL, and low serum ferritin. What is the most likely diagnosis?

Iron deficiency anemia. ### Iron deficiency anemia - The combination of **microcytic anemia** (MCV 72 fL) and **low serum ferritin** is highly indicative of iron deficiency [1], [2]. - **Fatigue, pallor, and dyspnea on exertion** are classic symptoms of any significant anemia [3]. *Vitamin B12 deficiency* - Typically causes **macrocytic anemia** (high MCV), not microcytic [2], [4]. - Associated with **neurological symptoms** (e.g., paresthesias) and megaloblastic changes in the bone marrow. *Folate deficiency* - Also results in **macrocytic anemia**, similarly to B12 deficiency, with a high MCV [2], [4]. - **Serum folate levels** would be low, and neurological symptoms are generally absent. *Anemia of chronic disease* - Can present with **normocytic** or mildly **microcytic anemia**, but generally has **normal or elevated ferritin** levels due to iron sequestration [1]. - The primary distinguishing factor here is the **low serum ferritin**, ruling out anemia of chronic disease [4].

Q: A 70-year-old male with anemia, hypercalcemia, and renal insufficiency presents with bone pain. Laboratory results show increased total protein, increased calcium, increased creatinine, and decreased hemoglobin. What is the most likely diagnosis?

Multiple myeloma. ***Multiple myeloma*** - The constellation of **anemia**, **hypercalcemia**, **renal insufficiency**, and **bone pain** in an elderly patient points strongly to multiple myeloma, often summarized by the acronym **CRAB** (Calcium elevation, Renal failure, Anemia, Bone lesions). [1] - Increased total protein, particularly in the presence of hypercalcemia and renal failure, further suggests the presence of a **paraprotein**, a hallmark of multiple myeloma. [1] *Bone metastasis* - While bone metastasis can cause bone pain and hypercalcemia, it typically does not present with unexplained **anemia** and **renal insufficiency** as primary features without an identified primary tumor. - The elevated total protein is less characteristic of bone metastasis compared to multiple myeloma, which involves excessive **monoclonal protein** production. *Primary hyperparathyroidism* - This condition is characterized by hypercalcemia and can lead to bone disease and renal stones, but it does not typically cause the significant **anemia** or the magnitude of **renal insufficiency** seen in this patient. - Total protein levels are usually normal in primary hyperparathyroidism, lacking the **paraprotein** seen in myeloma. *Osteoporosis* - Osteoporosis causes bone pain due to fractures and can lead to elevated calcium if severe and prolonged bed rest is involved, but it does not cause **anemia**, **renal insufficiency**, or elevated total protein. - Bone pain in osteoporosis is primarily due to **vertebral compression fractures**, not direct bone destruction by plasma cells.

Q: Which immunoglobulin is predominantly produced in multiple myeloma?

IgG. ***IgG*** - In **multiple myeloma**, the most common immunoglobulin produced is **IgG**, associated with increased bone marrow plasma cells [1]. - This condition is marked by the presence of a **monoclonal protein** (M-protein), frequently identified as **IgG** in the patient's serum or urine [1]. *IgA* - While **IgA** can be produced in some cases of multiple myeloma, it is less common than **IgG**. - Typically, it is associated with other conditions, like **IgA myeloma**, rather than being the predominant type. *IgE* - **IgE** is primarily involved in allergic reactions and parasitic infections and is not linked to multiple myeloma [2]. - It is generally present in **very low concentrations** in the serum compared to other immunoglobulins. *IgM* - Although **IgM** can be involved in certain plasma cell disorders, it is not the dominant immunoglobulin in **multiple myeloma**. - Its presence is typically associated with **Waldenström's macroglobulinemia** rather than myeloma specifically [1].

Q: A 45-year-old female with chronic alcohol use presents with fatigue and pallor. A peripheral blood smear shows macrocytes and hypersegmented neutrophils. Based on these findings, which underlying mechanism is most likely contributing to her anemia?

Decreased DNA synthesis due to vitamin B12 deficiency. - The presence of **macrocytic anemia** and **hypersegmented neutrophils** on the peripheral blood smear indicates impaired DNA synthesis, often due to vitamin B12 deficiency [1]. - Chronic alcohol use can lead to **malabsorption** of vitamin B12, thus exacerbating these hematological manifestations [1]. *Chronic blood loss leading to iron deficiency* - This type of anemia is typically **microcytic** due to iron deficiency, which does not align with the observed **macrocytes** in the blood smear. - Chronic blood loss usually presents with **fatigue and pallor**, but lacks the specific features of hypersegmented neutrophils. *Bone marrow suppression by alcohol* - While alcohol can affect bone marrow function, it generally leads to **pancytopenia** rather than specific findings of macrocytic anemia with hypersegmented neutrophils. - Bone marrow suppression would manifest with a less typical blood smear that does not specifically indicate vitamin B12 deficiency. *Increased hemolysis of red blood cells* - Hemolytic anemia usually presents with **normocytic** or **microcytic** cells rather than macrocytic cells in the blood smear. - Common signs of hemolysis, like increased **bilirubin** and **LDH levels**, would not be present alongside the specific findings here.

Q: A 45-year-old female with isolated thrombocytopenia (platelet count 20,000) requires the best test to evaluate bone marrow response. What is the appropriate test?

IPF. ### IPF - **Immature Platelet Fraction (IPF)** is a direct measure of the proportion of newly produced, young platelets in the peripheral blood, reflecting the current rate of **megakaryopoiesis** and bone marrow's response to thrombocytopenia. - A high IPF in the setting of decreased peripheral platelet count indicates an **adequate bone marrow response** to platelet destruction or consumption [1]. *Plt-associated IgG Ab* - **Platelet-associated IgG antibodies** are relevant for diagnosing **immune thrombocytopenic purpura (ITP)**, by indicating platelet destruction [1]. - While this test helps diagnose the cause of thrombocytopenia, it does not directly evaluate the **bone marrow's production capacity**. *vWF activity* - **Von Willebrand factor (vWF) activity** measures the function of vWF, which is crucial for **platelet adhesion** and aggregation. - This test is used to diagnose **von Willebrand disease**, a cause of bleeding disorders, but it does not assess bone marrow platelet production [1]. *RPI* - The **reticulocyte production index (RPI)** is a measure of the effective bone marrow **erythroid response** to anemia. - While useful for evaluating red blood cell production, the RPI does not provide information about the **bone marrow's platelet production**.

Q: A patient with chronic myeloid leukemia (CML) is undergoing molecular testing. If the BCR-ABL fusion gene is detected by FISH, how should this result impact the patient’s treatment strategy?

Start tyrosine kinase inhibitor therapy. Start tyrosine kinase inhibitor therapy - The detection of the **BCR-ABL fusion gene** is the hallmark of CML and signifies the presence of the **Philadelphia chromosome**. - **Tyrosine kinase inhibitors (TKIs)** such as imatinib, dasatinib, and nilotinib specifically target the tyrosine kinase activity of the BCR-ABL protein, making them the **first-line and most effective treatment** for CML [1], [2]. *Switch to conventional chemotherapy* - **Conventional chemotherapy** (e.g., hydroxycarbamide) is generally **less effective** and associated with more severe side effects compared to TKIs in CML treatment [1]. - While chemotherapy might be used in rare, specific circumstances (e.g., blastic crisis or TKI resistance), it is not the initial or primary treatment strategy when BCR-ABL is detected. *Plan for hematopoietic stem cell transplantation* - **Hematopoietic stem cell transplantation (HSCT)** is a potential **curative option** for CML but is usually reserved for patients who **fail TKI therapy** or have accelerated/blastic phase disease, not as an initial step [1]. - Due to significant risks and complications, HSCT is not the first-line treatment for a patient newly diagnosed with BCR-ABL positive CML. *Administer immunotherapy* - **Immunotherapy** is a broad term, and while some forms might be explored in resistant or relapsed CML, it is **not the primary treatment** for newly diagnosed BCR-ABL positive CML. - **TKIs** are the targeted therapy for CML, directly addressing the molecular driver of the disease, which is distinct from many forms of conventional immunotherapy [2].

Question 1

Which of the following is a typical cause of unconjugated hyperbilirubinemia?

Accepted Answer

Gilbert syndrome

Answer

Hemolytic anemia

Answer

Crigler-Najjar syndrome

Answer

Dubin-Johnson syndrome

Question 2

Which of the following statements is MOST accurate regarding cyanosis in methemoglobinemia?

Accepted Answer

Does not improve with supplemental oxygen

Answer

Always associated with tachycardia

Answer

Caused by increased carboxyhemoglobin levels

Answer

Can occur in both congenital and acquired forms of the disease.

Question 3

A 22-year-old male with a known history of sickle cell disease presents with sudden onset chest pain, dyspnea, and cyanosis. What is the most likely diagnosis and the immediate treatment?

Accepted Answer

Diagnosis: Acute chest syndrome; Treatment: Provide oxygen and hydration

Answer

Diagnosis: Pulmonary embolism; Treatment: Start anticoagulation

Answer

Diagnosis: Asthma exacerbation; Treatment: Use bronchodilators

Answer

Diagnosis: Pneumonia; Treatment: Administer antibiotics

Question 4

A 60-year-old man presents with fatigue, dark urine, and jaundice. He has a history of rheumatoid arthritis and is on methotrexate. His laboratory tests show hemolytic anemia. What is the most likely cause?

Accepted Answer

Autoimmune hemolytic anemia due to rheumatoid arthritis

Answer

Methotrexate-induced hemolysis

Answer

G6PD deficiency after oxidative stress

Answer

Paroxysmal nocturnal hemoglobinuria with hemoglobinuria

Question 5

A 65-year-old man presents with fatigue, pallor, and dyspnea on exertion. Laboratory tests show a hemoglobin level of 8 g/dL, an MCV of 72 fL, and low serum ferritin. What is the most likely diagnosis?

Accepted Answer

Iron deficiency anemia

Answer

Vitamin B12 deficiency

Answer

Folate deficiency

Answer

Anemia of chronic disease

Question 6

A 70-year-old male with anemia, hypercalcemia, and renal insufficiency presents with bone pain. Laboratory results show increased total protein, increased calcium, increased creatinine, and decreased hemoglobin. What is the most likely diagnosis?

Accepted Answer

Multiple myeloma

Answer

Bone metastasis

Answer

Primary hyperparathyroidism

Answer

Osteoporosis

Question 7

Which immunoglobulin is predominantly produced in multiple myeloma?

Accepted Answer

IgG

Answer

IgA

Answer

IgM

Answer

IgE

Question 8

A 45-year-old female with chronic alcohol use presents with fatigue and pallor. A peripheral blood smear shows macrocytes and hypersegmented neutrophils. Based on these findings, which underlying mechanism is most likely contributing to her anemia?

Accepted Answer

Decreased DNA synthesis due to vitamin B12 deficiency

Answer

Increased hemolysis of red blood cells

Answer

Chronic blood loss leading to iron deficiency

Answer

Bone marrow suppression by alcohol

Question 9

A 45-year-old female with isolated thrombocytopenia (platelet count 20,000) requires the best test to evaluate bone marrow response. What is the appropriate test?

Accepted Answer

IPF

Answer

Plt-associated IgG Ab

Answer

vWF activity

Answer

RPI

Question 10

A patient with chronic myeloid leukemia (CML) is undergoing molecular testing. If the BCR-ABL fusion gene is detected by FISH, how should this result impact the patient’s treatment strategy?

Accepted Answer

Start tyrosine kinase inhibitor therapy

Answer

Switch to conventional chemotherapy

Answer

Plan for hematopoietic stem cell transplantation

Answer

Administer immunotherapy

Hematology — MCQs

Hematology — MCQs

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