Hematology Practice Questions

Q: A patient presents with pallor, glossitis, and jaundice. Labs show high MCV and hypersegmented neutrophils. What is the most likely cause?

Vitamin B12 deficiency. ***Vitamin B12 deficiency*** - The combination of **pallor**, **glossitis**, **jaundice**, **high MCV (macrocytic anemia)**, and **hypersegmented neutrophils** is classic for megaloblastic anemia due to Vitamin B12 deficiency [1]. - **Jaundice** occurs due to ineffective erythropoiesis leading to intramedullary hemolysis and release of unconjugated bilirubin. *Iron deficiency* - This typically causes **microcytic, hypochromic anemia (low MCV)**, not high MCV [2]. - While it can cause pallor and glossitis, it does not cause **hypersegmented neutrophils** or jaundice. *Folate deficiency* - Folate deficiency also causes **macrocytic anemia** and **hypersegmented neutrophils**, along with pallor and glossitis [1]. - However, **jaundice** is more characteristic of Vitamin B12 deficiency due to the more pronounced ineffective erythropoiesis and associated hemolysis. *Hemolysis* - Hemolysis can cause **jaundice** and **pallor** due to the accelerated destruction of red blood cells. - However, acute or isolated hemolysis does not typically lead to **high MCV** or **hypersegmented neutrophils**, which are hallmarks of megaloblastic anemias.

Q: Which of the following statements about sickle cell disease is true?

Autosomal recessive. ### Autosomal recessive - Sickle cell disease is inherited in an **autosomal recessive pattern**, meaning an individual must inherit two copies of the abnormal gene (HbS) to develop the disease. - This mode of inheritance is crucial for genetic counseling and understanding family risk. [1] ### Sickled cells are flexible - **Sickled cells are rigid** and inflexible, unlike normal red blood cells, which contributes to their inability to easily pass through small blood vessels. [1] - Their stiffness is a key factor in the pathology of vaso-occlusion, as they tend to clog capillaries. ### Vaso-occlusion is rare - **Vaso-occlusion is a hallmark** and frequent complication of sickle cell disease, leading to painful crises and organ damage. [1] - The rigid, sickled red blood cells block blood flow in small vessels, causing ischemia and infarction in various tissues. ### Chronic hemolysis does not occur - **Chronic hemolysis is a prominent feature** of sickle cell disease, as the sickled red blood cells are fragile and have a shortened lifespan, leading to constant destruction. [1] - This ongoing destruction of red blood cells causes **anemia**, jaundice, and can contribute to gallstone formation. [1]

Q: A 45-year-old male presents with fatigue, pale skin, and jaundice. Labs reveal hemolysis and a positive direct Coombs test. What is the most likely diagnosis?

Autoimmune hemolytic anemia. ***Autoimmune hemolytic anemia*** - The combination of **hemolysis** (fatigue, pale skin, jaundice) and a **positive direct Coombs test** is highly indicative of autoimmune hemolytic anemia [1]. - A positive direct Coombs test identifies **antibodies or complement components** bound to the surface of red blood cells, leading to their destruction [1]. *Hereditary spherocytosis* - This condition is characterized by **spherocytes** on a peripheral blood smear and an **increased osmotic fragility test** [3]. - While it causes hemolysis, a **direct Coombs test** would typically be negative as it's an intrinsic red blood cell defect, not antibody-mediated [1]. *Sickle cell anemia* - Characterized by **sickle-shaped red blood cells** and is diagnosed with **hemoglobin electrophoresis**. - While it causes hemolytic anemia, the direct Coombs test is typically **negative**, and symptoms often include **vaso-occlusive crises**. *G6PD deficiency* - This is an **X-linked recessive enzymopathy** leading to bite cells and **Heinz bodies** during oxidative stress [2]. - The direct Coombs test would be **negative**, as the hemolysis is due to enzyme deficiency, not antibodies [2].

Q: Which of the following is used in the treatment of Hemophilia B?

Factor IX. ***Factor IX*** - Hemophilia B is a genetic bleeding disorder caused by a deficiency of **Factor IX** (FIX), a coagulation factor produced in the liver [2]. - Treatment involves intravenous administration of **recombinant Factor IX** or Factor IX concentrates to replace the missing clotting factor and achieve hemostasis [1]. *Cryoprecipitate* - Cryoprecipitate is a blood product rich in **Factor VIII**, von Willebrand factor, fibrinogen, and Factor XIII. - It is primarily used in the management of **Hemophilia A** (Factor VIII deficiency) or von Willebrand disease, not Hemophilia B. *Fresh frozen plasma* - Fresh frozen plasma (FFP) contains **all coagulation factors**, including Factor IX, but in lower concentrations compared to specific factor concentrates. - While FFP can be used in some clotting factor deficiencies, **Factor IX concentrate** is preferred for Hemophilia B due to a higher concentration of Factor IX with a smaller fluid volume, reducing the risk of fluid overload [1]. *Factor VIII* - **Factor VIII** is the deficient clotting factor in **Hemophilia A** [2]. - Administration of Factor VIII is the primary treatment for Hemophilia A, and it is not used in the management of Hemophilia B [1].

Q: In folate deficiency, which of the following statements is true?

Elevated homocysteine & normal methylmalonic acid. ***Elevated homocysteine & normal methylmalonic acid*** - In **folate deficiency**, the conversion of homocysteine to methionine is impaired, leading to **elevated homocysteine** levels. - Unlike vitamin B12 deficiency, **methylmalonic acid (MMA)** levels remain normal in folate deficiency because folate is not involved in its metabolism. *B12 supplementation is recommended along with folate* - Supplementation with B12 alongside folate is crucial when **macrocytic anemia** is diagnosed, as it can mask a coexisting **B12 deficiency**, potentially worsening neurological symptoms if only folate is given. - However, in confirmed isolated folate deficiency, B12 supplementation is not strictly necessary unless there is suspicion or diagnosis of co-existing B12 deficiency. *Purine and pyrimidine synthesis are affected* - While folate is essential for **DNA synthesis**, indirectly affecting purine and pyrimidine production, this statement is a consequence rather than the primary diagnostic or distinguishing feature of folate deficiency. - **Folate** acts as a coenzyme in transferring one-carbon units, vital for the synthesis of **thymidylate** (a pyrimidine base) and **purine precursors**. *Hemolytic anemia is not a feature* - **Hemolytic anemia** is not typically a feature of folate deficiency; instead, it is characterized by **macrocytic, megaloblastic anemia**. - Conditions like **glucose-6-phosphate dehydrogenase (G6PD) deficiency** or **autoimmune disorders** are commonly associated with hemolytic anemia.

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].

Question 1

A patient presents with pallor, glossitis, and jaundice. Labs show high MCV and hypersegmented neutrophils. What is the most likely cause?

Accepted Answer

Vitamin B12 deficiency

Answer

Iron deficiency

Answer

Folate deficiency

Answer

Hemolysis

Question 2

Which of the following statements about sickle cell disease is true?

Accepted Answer

Autosomal recessive

Answer

Sickled cells are flexible

Answer

Vaso-occlusion is rare

Answer

Chronic hemolysis does not occur

Question 3

A 45-year-old male presents with fatigue, pale skin, and jaundice. Labs reveal hemolysis and a positive direct Coombs test. What is the most likely diagnosis?

Accepted Answer

Autoimmune hemolytic anemia

Answer

Hereditary spherocytosis

Answer

Sickle cell anemia

Answer

G6PD deficiency

Question 4

Which of the following is used in the treatment of Hemophilia B?

Accepted Answer

Factor IX

Answer

Cryoprecipitate

Answer

Fresh frozen plasma

Answer

Factor VIII

Question 5

In folate deficiency, which of the following statements is true?

Accepted Answer

Elevated homocysteine & normal methylmalonic acid

Answer

B12 supplementation is recommended along with folate

Answer

Purine and pyrimidine synthesis are affected

Answer

Hemolytic anemia is not a feature

Question 6

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 7

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 8

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 9

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 10

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

Hematology — MCQs

Hematology — MCQs

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