Hematology Practice Questions

Q: In hemophilia, which of the following is raised?

Activated Partial Thromboplastin Time (aPTT). **Explanation:** Hemophilia (A and B) is a disorder of the **intrinsic pathway** of the coagulation cascade [1]. Hemophilia A is a deficiency of Factor VIII, and Hemophilia B (Christmas disease) is a deficiency of Factor IX [3]. **1. Why aPTT is the correct answer:** The **Activated Partial Thromboplastin Time (aPTT)** measures the integrity of the **intrinsic** and common pathways (Factors XII, XI, IX, VIII, X, V, II, and I) [1]. Since Hemophilia involves a deficiency in Factor VIII or IX, the intrinsic pathway is impaired, leading to a prolonged (raised) aPTT [1]. **2. Why the other options are incorrect:** * **Bleeding Time (BT):** This measures **platelet function** and primary hemostasis (platelet plug formation). In hemophilia, platelet count and function are normal, so BT remains normal. * **Prothrombin Time (PT):** This measures the **extrinsic** and common pathways (specifically Factor VII) [1]. Factors VIII and IX are not involved in the extrinsic pathway; therefore, PT is normal in hemophilia [1]. * **Clotting Time (CT):** While CT can be raised in severe hemophilia, it is a crude, insensitive, and outdated bedside test. In modern clinical practice and medical examinations, **aPTT** is the specific and preferred laboratory parameter for screening coagulation factor deficiencies in the intrinsic pathway. **Clinical Pearls for NEET-PG:** * **Inheritance:** Both Hemophilia A and B are **X-linked recessive** (mostly affecting males) [2]. * **Mixing Study:** If aPTT is prolonged, a mixing study (adding normal plasma) is done [1]. If the aPTT corrects, it indicates a **factor deficiency**; if it doesn't, it suggests an **inhibitor/antibody**. [1] * **vWD vs. Hemophilia:** In von Willebrand Disease, both BT and aPTT can be raised (as vWF stabilizes Factor VIII). In Hemophilia, **only** aPTT is raised. * **Most common site of bleeding:** Hemarthrosis (bleeding into joints, commonly the knee).

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

Hemolysis is predominantly intravascular.. In Sickle Cell Disease (SCD), the primary mechanism of red cell destruction is extravascular hemolysis [1]. Sickled erythrocytes are rigid and non-deformable; as they pass through the splenic sinusoids, they are recognized as abnormal and sequestered by splenic macrophages [1]. While some minor intravascular hemolysis occurs due to mechanical fragility, the predominant site of destruction is the reticuloendothelial system (spleen and liver). **Analysis of Options:** * **Option A (True):** Sickle cell trait (HbAS) provides a survival advantage against *Plasmodium falciparum* malaria. The parasite consumes oxygen, causing the cell to sickle and be cleared by the spleen, thereby reducing the parasite burden. * **Option B (True):** The molecular basis of SCD is a point mutation (GAG → GTG) in the β-globin gene, resulting in the substitution of **Glutamic acid (polar) by Valine (non-polar)** at the 6th position of the β-chain [2]. * **Option C (True):** **Hyposthenuria** (inability to concentrate urine) is a classic finding. Repeated micro-infarctions in the renal medulla (due to the hypertonic, hypoxic environment) damage the vasa recta, impairing the countercurrent exchange mechanism. **NEET-PG High-Yield Pearls:** 1. **Autosplenectomy:** Repeated splenic infarctions lead to a shrunken, fibrotic spleen by childhood, increasing susceptibility to encapsulated organisms (*S. pneumoniae*, *H. influenzae*) [1]. 2. **Howell-Jolly Bodies:** These nuclear remnants are seen on peripheral smears post-autosplenectomy. 3. **Salmonella Osteomyelitis:** While *S. aureus* is the most common cause of osteomyelitis overall, patients with SCD have a uniquely high predisposition to *Salmonella* species. 4. **Aplastic Crisis:** Most commonly triggered by **Parvovirus B19** infection [1].

Q: Autoimmune destruction of platelets is seen in which of the following conditions?

Systemic Lupus Erythematosus (SLE). **Explanation:** The correct answer is **Systemic Lupus Erythematosus (SLE)**. **1. Why SLE is correct:** SLE is a multisystem autoimmune disorder characterized by the production of various autoantibodies [1]. Hematological involvement is a hallmark of the disease. Thrombocytopenia in SLE occurs primarily due to **immune-mediated destruction of platelets**, where anti-platelet antibodies (IgG) coat the platelets, leading to their premature clearance by the splenic macrophages [2]. This mechanism is identical to **Immune Thrombocytopenic Purpura (ITP)**. In fact, ITP can often be the presenting feature of SLE. **2. Why other options are incorrect:** * **Polyarteritis Nodosa (PAN):** This is a necrotizing vasculitis of medium-sized arteries. While it causes multisystem involvement (renal, GI, skin), it does not typically involve autoantibody-mediated destruction of platelets. * **Rheumatoid Arthritis (RA):** While RA is autoimmune, its primary hematological association is **Felty’s Syndrome** (RA, Splenomegaly, and Neutropenia). Thrombocytopenia is not a classic feature unless secondary to drug toxicity (e.g., methotrexate) or hypersplenism. * **Sarcoidosis:** This is a granulomatous disease. Hematological issues usually involve lymphopenia or anemia of chronic disease. Thrombocytopenia, if present, is usually due to splenic sequestration (splenomegaly) rather than direct autoimmune destruction. **Clinical Pearls for NEET-PG:** * **Evans Syndrome:** The coexistence of Autoimmune Hemolytic Anemia (AIHA) and Immune Thrombocytopenia (ITP); frequently associated with SLE. * **Most common hematological abnormality in SLE:** Anemia of Chronic Disease (however, Lymphopenia is the most *specific* hematologic criteria in the ACR classification) [2]. * **Mechanism:** Type II Hypersensitivity reaction (Antibody-mediated) [3].

Q: All of the following can lead to the development of overt anemia in patients with long-standing compensated hemolytic anemia, EXCEPT:

Hypothyroidism. In patients with **compensated hemolytic anemia**, the bone marrow increases erythropoiesis (up to 6–8 times the normal rate) to match the shortened lifespan of red blood cells. **Overt anemia** occurs when this delicate balance is disrupted, either by an increased demand for RBCs or a decrease in marrow production. ### Why Hypothyroidism is the Correct Answer **Hypothyroidism** typically causes a mild, normocytic, hypoproliferative anemia due to a generalized decrease in metabolic rate and tissue oxygen demand, which leads to reduced erythropoietin (EPO) production. However, it does **not** cause an acute "decompensation" or a sudden crisis in hemolytic states. Unlike the other options, it does not acutely interfere with the high-turnover requirements of a hemolytic marrow. ### Explanation of Incorrect Options * **Pregnancy:** Increases plasma volume (dilutional effect) and significantly raises the demand for RBC production and nutrients. This can tip a compensated state into overt anemia. * **Renal Failure:** Leads to a deficiency in **Erythropoietin (EPO)**. In hemolysis, the marrow requires high levels of EPO to maintain compensation; loss of EPO leads to a rapid drop in hemoglobin. * **Folate Deficiency:** Hemolysis creates a high-turnover state with a massive demand for folate for DNA synthesis. If stores are depleted, a **megaloblastic/aplastic crisis** occurs, causing profound anemia. ### High-Yield Clinical Pearls for NEET-PG * **Aplastic Crisis:** Most commonly caused by **Parvovirus B19**, which infects erythrocyte precursors. * **Megaloblastic Crisis:** Caused by folate deficiency due to chronic hyperactive erythropoiesis. * **Hemolytic Crisis:** An acute acceleration of hemolysis (e.g., G6PD deficiency after oxidant stress). * **Splenic Sequestration:** Common in Sickle Cell Anemia; causes sudden pooling of blood in the spleen and acute anemia.

Q: Which of the following is NOT included in the differential diagnosis of microangiopathic hemolytic anemia?

Myocardial infarction. **Explanation:** Microangiopathic Hemolytic Anemia (MAHA) is a descriptive term for non-immune hemolytic anemias characterized by **fragmentation of red blood cells (schistocytes)** [1]. This occurs due to mechanical shearing of erythrocytes as they pass through small blood vessels obstructed by fibrin or platelet thrombi [1]. **Why Myocardial Infarction (MI) is the correct answer:** MI is a macrovascular event typically caused by the occlusion of a coronary artery by an atherosclerotic plaque or thrombus. It does not involve systemic microvascular pathology or the mechanical shearing of RBCs. Therefore, it is not a cause of MAHA. **Analysis of Incorrect Options:** * **Sepsis:** Severe sepsis can trigger **Disseminated Intravascular Coagulation (DIC)** [2]. In DIC, widespread fibrin deposition in the microvasculature leads to RBC fragmentation and schistocyte formation [1]. * **Hemolytic Uremic Syndrome (HUS):** This is a classic cause of MAHA, characterized by the triad of microangiopathic anemia, thrombocytopenia, and acute renal failure, typically due to Shiga toxin-induced endothelial damage [1]. * **Eclampsia:** Preeclampsia and eclampsia can lead to **HELLP syndrome** (Hemolysis, Elevated Liver enzymes, Low Platelets), which is a specific form of MAHA occurring in pregnancy [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Finding:** The presence of **schistocytes** (helmet cells) on a peripheral blood smear (>1% is significant). * **Laboratory Markers:** Elevated LDH, decreased haptoglobin, and indirect hyperbilirubinemia (all markers of hemolysis), with a **negative Direct Coombs Test** (confirming non-immune etiology). * **Primary Differential (The "Pentad" of TTP):** Fever, Anemia (MAHA), Thrombocytopenia, Neurological symptoms, and Renal failure. * **Other Causes:** Malignant hypertension, Systemic Sclerosis (Scleroderma renal crisis), and prosthetic heart valves (Macroangiopathic) [1].

Q: A 33-year-old alcoholic patient on anti-tuberculosis treatment presents with increased serum iron and increased transferrin saturation. What is the most likely diagnosis?

Sideroblastic anemia. ### Explanation **Correct Answer: B. Sideroblastic Anemia** The clinical presentation points toward **Sideroblastic Anemia**, a defect in heme synthesis. In this condition, iron is available but cannot be incorporated into protoporphyrin to form heme. This leads to iron overload in the mitochondria of erythroid precursors, forming "ringed sideroblasts." * **Underlying Mechanism:** The patient has two major risk factors: **Alcoholism** (a common cause of acquired sideroblastic anemia) and **Anti-Tuberculosis Treatment (Isoniazid)**. Isoniazid is a Vitamin B6 (Pyridoxine) antagonist. Since B6 is a mandatory cofactor for **ALA synthase** (the rate-limiting enzyme in heme synthesis), its deficiency leads to impaired heme production and subsequent iron accumulation. * **Iron Profile:** Because iron is not being utilized, serum iron increases, and transferrin saturation rises, reflecting systemic iron overload. **Why other options are incorrect:** * **A. Iron Deficiency Anemia:** Characterized by *decreased* serum iron and *decreased* transferrin saturation (opposite of this case). * **C. Megaloblastic Anemia:** While common in alcoholics (Folate deficiency), it typically presents with normal or slightly elevated iron; however, it does not explain the specific association with INH or the classic iron-overload profile seen here. * **D. Anemia of Chronic Disease:** Characterized by *decreased* serum iron and *decreased* TIBC due to iron sequestration in macrophages (hepcidin-mediated). **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Bone marrow examination showing **Ringed Sideroblasts** (Prussian Blue stain). * **Management:** Discontinue the offending agent (Alcohol/INH) and supplement with **Pyridoxine (Vitamin B6)**. * **Lead Poisoning:** Another cause of sideroblastic anemia; look for "basophilic stippling" and "Burtonian lines" on gums.

Question 1

A 27-year-old female presents with easy fatigue and light-headedness. She also has a dry cough and fever for the past few days. On examination, she is pale, her lungs are clear, and the rest is normal. A chest x-ray shows patchy bilateral infiltrates; the hemoglobin is 8.4 g/dL, reticulocyte count of 6%, and many spherocytes on the peripheral blood film. Which of the following is the most likely significance of the spherocytosis on the blood film?

Accepted Answer

Coombs'-positive hemolytic anemia

Answer

Multiple long bone fractures

Answer

Hereditary elliptocytosis

Answer

Glucose-6-phosphate dehydrogenase (G6PD) deficiency

Question 2

A 42-year-old male presents with fatigue, pale skin, and exertional dyspnea. Laboratory findings reveal macrocytic, hyperchromic anemia with hyper-segmented neutrophils. Folate levels are normal. The patient reports long-term omeprazole use for gastric reflux disease. Which of the following interventions is indicated for this patient?

Accepted Answer

Vitamin B12 injections

Answer

Oral folic acid supplementation

Answer

Vitamin B6 injections

Answer

Intrinsic factor injections

Question 3

In hemophilia, which of the following is raised?

Accepted Answer

Activated Partial Thromboplastin Time (aPTT)

Answer

Bleeding Time (BT)

Answer

Clotting Time (CT)

Answer

Prothrombin Time (PT)

Question 4

Which of the following statements is NOT true about heparin-induced thrombocytopenia?

Accepted Answer

It is more common with unfractionated heparin than low molecular weight heparin.

Answer

Low molecular weight heparins should not be used for treatment.

Answer

It causes both arterial and venous thrombosis.

Answer

It typically occurs after about a week of heparin therapy.

Question 5

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

Accepted Answer

Hemolysis is predominantly intravascular.

Answer

Sickle cell trait confers a protective effect against malaria.

Answer

There is a replacement of glutamic acid by valine at the beta-6 position.

Answer

Hyposthenuria is a characteristic finding.

Question 6

Autoimmune destruction of platelets is seen in which of the following conditions?

Accepted Answer

Systemic Lupus Erythematosus (SLE)

Answer

Polyarteritis Nodosa (PAN)

Answer

Rheumatoid Arthritis (RA)

Answer

Sarcoidosis

Question 7

All of the following can lead to the development of overt anemia in patients with long-standing compensated hemolytic anemia, EXCEPT:

Accepted Answer

Hypothyroidism

Answer

Pregnancy

Answer

Renal failure

Answer

Folate deficiency

Question 8

Which of the following is NOT a side effect of massive blood transfusion?

Accepted Answer

Hypokalemia

Answer

Hypothermia

Answer

Hypocalcemia

Answer

Hypomagnesemia

Question 9

Which of the following is NOT included in the differential diagnosis of microangiopathic hemolytic anemia?

Accepted Answer

Myocardial infarction

Answer

Sepsis

Answer

Hemolytic uremic syndrome

Answer

Eclampsia

Question 10

A 33-year-old alcoholic patient on anti-tuberculosis treatment presents with increased serum iron and increased transferrin saturation. What is the most likely diagnosis?

Accepted Answer

Sideroblastic anemia

Answer

Iron deficiency anemia

Answer

Megaloblastic anemia

Answer

Anemia of chronic disease

Hematology — MCQs

Hematology — MCQs

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