Hematology — MCQs

A 30-year-old male presented with dark-coloured urine for 1 week, typically occurring at night. Examination revealed no splenomegaly. Laboratory findings included increased indirect bilirubin, hemoglobinemia, hemoglobinuria, absent haptoglobin, raised LDH, hemosiderinuria, and reticulocytosis. Flow cytometry studies were performed. The drug approved for this condition works by blocking which component of the complement system?

Q127Easy

Which of the following is characteristic of hemophilia?

Q128Easy

What is the best diagnostic test for Thalassemia?

Q129Medium

A 40-year-old man has megaloblastic anemia and early signs of neurological abnormality. What is the most probable drug required?

Q130Medium

In a patient with iron deficiency anemia undergoing iron therapy, what is considered an adequate rate of hemoglobin level increase per week?

Hematology Indian Medical PG Practice Questions and MCQs

Question 121: Hemochromatosis affects the following organs EXCEPT?

A. Liver
B. Heart
C. Pancreas
D. Brain (Correct Answer)

Explanation: Hemochromatosis is a disorder of iron overload where excessive iron is deposited in the parenchymal cells of various organs, leading to tissue damage and fibrosis [1]. **Why the Brain is the correct answer:** The **Brain** is generally spared in hereditary hemochromatosis because the **blood-brain barrier (BBB)** strictly regulates iron transport into the central nervous system. While iron can accumulate in the pituitary gland (leading to hypogonadotropic hypogonadism) [1], it does not deposit in the brain parenchyma itself. Therefore, neurological deficits are not a classic feature of the disease. **Why the other options are incorrect:** * **Liver:** This is the most common site of iron deposition. It leads to hepatomegaly, cirrhosis, and significantly increases the risk of **Hepatocellular Carcinoma (HCC)** [1], [2]. * **Pancreas:** Iron deposition in the islet cells causes selective endocrine dysfunction, leading to secondary diabetes mellitus [1]. This, combined with skin hyperpigmentation, is famously known as **"Bronze Diabetes."** * **Heart:** Iron accumulation in the myocardium leads to **Restrictive Cardiomyopathy** (early stage) or Dilated Cardiomyopathy, often manifesting as heart failure or arrhythmias. **Clinical Pearls for NEET-PG:** * **Classic Triad:** Cirrhosis, Diabetes Mellitus, and Skin Pigmentation [1]. * **Joint Involvement:** Characterized by "hook-like" osteophytes on X-ray, commonly affecting the 2nd and 3rd MCP joints (Pseudogout/CPPD). * **Infection Risk:** Patients are susceptible to siderophilic (iron-loving) organisms like *Vibrio vulnificus*, *Listeria*, and *Yersinia enterocolitica*. * **Diagnosis:** Best initial test is **Transferrin Saturation** (>45%); Gold standard is **MRI (T2*)** or Liver Biopsy (Prussian Blue stain) [2]. * **Treatment:** Therapeutic Phlebotomy is the mainstay [2].

Question 122: A patient presents with an Hb of 6 g/dL, WBC count of 2000/mm³, normal differential count except for 6% blasts, and platelets reduced to 80,000/mm³. Moderate splenomegaly is also noted. What is the most likely diagnosis?

A. Leukemia (Correct Answer)
B. Aplastic anemia
C. Hemolysis
D. Immune thrombocytopenic purpura (ITP)

Explanation: ### Explanation The clinical presentation describes **pancytopenia** (anemia, leukopenia, and thrombocytopenia) associated with **splenomegaly** and the presence of **circulating blasts**. **1. Why Leukemia is the Correct Answer:** The defining feature in this case is the presence of **6% blasts** in the peripheral blood. In a patient with pancytopenia, the presence of any significant number of blasts (immature cells) strongly suggests a primary bone marrow pathology, most commonly **Acute Leukemia** [1]. While a definitive diagnosis of Acute Myeloid Leukemia (AML) requires ≥20% blasts in the marrow or blood, the presence of 6% blasts in the context of cytopenias and **splenomegaly** (which indicates extramedullary involvement or marrow infiltration) makes leukemia the most likely diagnosis among the choices [2]. **2. Why Other Options are Incorrect:** * **Aplastic Anemia:** While it presents with pancytopenia, it is characterized by an "empty" marrow. Crucially, **splenomegaly is typically absent** in aplastic anemia, and blasts are never seen. * **Hemolysis:** This usually presents with anemia and jaundice. While it can cause splenomegaly, it does not cause leukopenia, thrombocytopenia, or the presence of blasts. * **Immune Thrombocytopenic Purpura (ITP):** This is characterized by isolated thrombocytopenia. The Hb and WBC counts remain normal, and there is no splenomegaly. **3. NEET-PG Clinical Pearls:** * **Pancytopenia + Splenomegaly:** Think of Leukemia, Myelofibrosis [3], Hypersplenism, or Kala-azar. * **Pancytopenia - Splenomegaly:** Think of Aplastic Anemia or Megaloblastic Anemia. * **Blast Cells:** Their presence in peripheral blood is always pathological and usually indicates a "leukemic gap" or marrow "spill-over" from a hematological malignancy [1]. * **Gold Standard:** Bone marrow aspiration and biopsy are essential to differentiate between "hypocellular" (Aplastic) and "hypercellular" (Leukemic) causes of pancytopenia.

Question 123: Leucocyte alkaline phosphatase (LAP) is raised in all conditions except?

A. Myelofibrosis
B. Essential thrombocythemia
C. Chronic myeloid leukemia (Correct Answer)
D. Polycythemia vera

Explanation: **Explanation:** The **Leucocyte Alkaline Phosphatase (LAP) score** (also known as the Neutrophil Alkaline Phosphatase/NAP score) is a measure of the enzyme activity within mature neutrophils. It is a crucial diagnostic tool used to differentiate a **Leukemoid reaction** or **Myeloproliferative Neoplasms (MPNs)** from **Chronic Myeloid Leukemia (CML)**. **Why CML is the correct answer:** In **Chronic Myeloid Leukemia**, the neoplastic neutrophils are biochemically abnormal and lack the LAP enzyme [1]. Therefore, a **low or zero LAP score** is a hallmark of CML (specifically in the chronic phase). This helps distinguish it from a Leukemoid reaction, where the score is significantly elevated. **Analysis of other options:** * **Polycythemia Vera (PV), Essential Thrombocythemia (ET), and Myelofibrosis:** These are all BCR-ABL negative Myeloproliferative Neoplasms [1]. Unlike CML, the mature neutrophils produced in these conditions are functionally and biochemically capable of producing the LAP enzyme, leading to a **raised or normal LAP score**. * **Leukemoid Reaction:** Though not an option here, it is the most common cause of a highly raised LAP score. **High-Yield Clinical Pearls for NEET-PG:** * **LAP Score in CML:** It is **decreased** in the chronic phase but may **increase** during a Blast Crisis or if there is a concurrent infection. * **Other causes of Low LAP Score:** Paroxysmal Nocturnal Hemoglobinuria (PNH), Hypophosphatasia, and Acute Myeloid Leukemia (AML) [1]. * **Causes of High LAP Score:** Pregnancy, Oral Contraceptive Pills (OCPs), Leukemoid reaction, and MPNs (PV, ET, Myelofibrosis) [1]. * **Modern Diagnosis:** While the LAP score is high-yield for exams, modern diagnosis of CML relies on demonstrating the **Philadelphia chromosome t(9;22)** or the **BCR-ABL1** fusion gene via FISH or PCR [1].

Question 124: Salmonellosis is most common in which of the following conditions?

A. Sickle cell anemia (Correct Answer)
B. Thalassemia
C. Hemophilia
D. Cystic fibrosis

Explanation: The correct answer is **Sickle Cell Anemia (SCA)**. Patients with SCA have a markedly increased susceptibility to *Salmonella* infections, most notably **Salmonella Osteomyelitis**. [1] **Why Sickle Cell Anemia is the correct answer:** The predisposition to Salmonellosis in SCA is multifactorial: 1. **Autosplenectomy:** Chronic sickling leads to splenic infarction and functional asplenia, impairing the clearance of encapsulated and intracellular organisms like *Salmonella*. [1] 2. **Complement Dysfunction:** There is a defect in the alternative complement pathway, which is essential for opsonizing *Salmonella*. 3. **Bowel Infarction:** Microvascular occlusion in the gut wall allows *Salmonella* (normal flora in some) to translocate into the bloodstream. 4. **Expanded Bone Marrow:** Chronic hemolysis leads to expanded, sluggish circulation in the bone marrow with areas of micro-infarction, providing an ideal nidus for bacterial seeding. [1] **Why other options are incorrect:** * **Thalassemia:** While these patients are prone to infections due to iron overload (siderophilic bacteria like *Yersinia enterocolitica*), they do not have the specific physiological predisposition to *Salmonella* seen in SCA. [1] * **Hemophilia:** This is a coagulation disorder. Increased infection risk is usually secondary to blood transfusions (HIV, Hepatitis) rather than a primary susceptibility to *Salmonella*. * **Cystic Fibrosis:** These patients are primarily predisposed to respiratory infections, most commonly *Staphylococcus aureus* (in childhood) and *Pseudomonas aeruginosa* (in adults). **Clinical Pearls for NEET-PG:** * **Most common cause of Osteomyelitis in SCA:** *Salmonella* species (unique to SCA). * **Most common cause of Osteomyelitis in the general population:** *Staphylococcus aureus*. * **Hand-Foot Syndrome (Dactylitis):** Often the first clinical manifestation of SCA in infants, which must be differentiated from osteomyelitis. [1] * **Prophylaxis:** Daily Penicillin prophylaxis is recommended in children with SCA until age 5 to prevent pneumococcal sepsis.

Question 125: All of the following can be associated with paroxysmal nocturnal hemoglobinuria (PNH) except?

A. Cerebral thrombosis
B. Budd-Chiari syndrome
C. Pancytopenia
D. Massive splenomegaly (Correct Answer)

Explanation: Paroxysmal Nocturnal Hemoglobinuria (PNH) is an acquired clonal hematopoietic stem cell disorder caused by a somatic mutation in the PIGA gene. This leads to a deficiency of Glycosylphosphatidylinositol (GPI) anchor proteins, resulting in the absence of complement regulatory proteins CD55 and CD59 on the surface of blood cells. Why Massive Splenomegaly is the Correct Answer: In PNH, hemolysis is primarily intravascular (due to complement-mediated membrane attack complex formation) [1]. Unlike extravascular hemolysis (e.g., Hereditary Spherocytosis), where the spleen destroys abnormal cells, PNH does not typically cause significant organomegaly. If splenomegaly is present, it is usually mild or suggests a complication like splenic vein thrombosis. Massive splenomegaly is a hallmark of myeloproliferative neoplasms or visceral leishmaniasis [2], not PNH. Analysis of Incorrect Options: * A & B (Cerebral Thrombosis & Budd-Chiari Syndrome): Thrombosis is the leading cause of death in PNH. It occurs due to nitric oxide depletion and platelet activation. PNH has a predilection for unusual venous sites, including the hepatic veins (Budd-Chiari syndrome), cerebral sinuses, and mesenteric veins. * C (Pancytopenia): PNH is a stem cell disorder. It frequently overlaps with Aplastic Anemia, and bone marrow failure leading to pancytopenia is a common clinical presentation. NEET-PG High-Yield Pearls: * Gold Standard Diagnosis: Flow cytometry (shows absence of CD55/CD59). * Classic Triad: Hemolytic anemia, pancytopenia, and thrombosis. * Treatment: Eculizumab (Monoclonal antibody against C5 complement). * Screening Test: Ham’s test (Acidified serum lysis) and Sucrose lysis test (now largely replaced by flow cytometry).

Question 126: A 30-year-old male presented with dark-coloured urine for 1 week, typically occurring at night. Examination revealed no splenomegaly. Laboratory findings included increased indirect bilirubin, hemoglobinemia, hemoglobinuria, absent haptoglobin, raised LDH, hemosiderinuria, and reticulocytosis. Flow cytometry studies were performed. The drug approved for this condition works by blocking which component of the complement system?

A. C3a
B. C5 (Correct Answer)
C. MAC complex
D. C1q

Explanation: ### Explanation **Diagnosis:** The clinical presentation of dark-colored urine (nocturnal hemoglobinuria), absence of splenomegaly, and laboratory evidence of intravascular hemolysis (hemoglobinemia, hemoglobinuria, low haptoglobin, raised LDH, and hemosiderinuria) is classic for **Paroxysmal Nocturnal Hemoglobinuria (PNH)** [1]. PNH is an acquired clonal stem cell disorder caused by a mutation in the **PIGA gene**, leading to a deficiency of GPI-anchored proteins like **CD55 (DAF)** and **CD59 (MIRL)**, which normally protect RBCs from complement-mediated lysis. **Why C5 is Correct:** The standard of care for symptomatic PNH is **Eculizumab** (or the longer-acting Ravulizumab). Eculizumab is a humanized monoclonal antibody that binds to the **C5 complement protein**. By blocking the cleavage of C5 into C5a and C5b, it prevents the formation of the **Membrane Attack Complex (MAC)**. This effectively halts intravascular hemolysis, reduces the need for transfusions, and lowers the risk of thrombosis. **Analysis of Incorrect Options:** * **A. C3a:** While C3 activation occurs upstream, current approved first-line therapies like Eculizumab target C5. (Note: Newer drugs like Pegcetacoplan target C3, but C5 remains the classic board-answer for primary management). * **C. MAC complex:** While the drug prevents the *formation* of the MAC (C5b-C9), it specifically binds to the **C5 protein** itself to achieve this. * **D. C1q:** This is part of the classical pathway. PNH hemolysis is primarily driven by the alternative pathway of the complement system. **NEET-PG High-Yield Pearls:** * **Gold Standard Test:** Flow cytometry (shows deficiency of CD55 and CD59 on RBCs and WBCs). * **Ham’s Test/Sucrose Lysis Test:** Historical tests, now replaced by flow cytometry. * **Most Common Cause of Death:** Thrombosis (often in unusual sites like hepatic veins—Budd-Chiari syndrome). * **Treatment Precaution:** Patients on Eculizumab must be vaccinated against **Neisseria meningitidis** because blocking C5 increases susceptibility to encapsulated organisms. [1]

Question 127: Which of the following is characteristic of hemophilia?

A. Affects males and females equally
B. Increased clotting time in all patients (Correct Answer)
C. Nerve blocks can be given safely
D. Is a congenital disorder

Explanation: **Explanation:** Hemophilia (A and B) is a classic X-linked recessive bleeding disorder characterized by a deficiency in clotting factors (Factor VIII in Hemophilia A; Factor IX in Hemophilia B) [1]. **1. Why the Correct Answer is Right:** In the coagulation cascade, Factors VIII and IX are essential components of the **intrinsic pathway**. A deficiency in these factors leads to a failure in the conversion of prothrombin to thrombin, thereby prolonging the **Clotting Time (CT)**. While the Activated Partial Thromboplastin Time (aPTT) is the more sensitive laboratory marker, an increased CT is a hallmark characteristic seen in all symptomatic patients due to the disruption of the secondary hemostatic plug formation. **2. Analysis of Incorrect Options:** * **Option A:** As an **X-linked recessive** disorder [1], it primarily affects **males**. Females are typically asymptomatic carriers; they only manifest the disease if they have Turner syndrome (XO), extreme lyonization, or are offspring of an affected father and carrier mother. * **Option C:** Deep tissue injections and **nerve blocks are contraindicated** in hemophiliacs due to the high risk of hematoma formation [1], which can lead to compartment syndrome or permanent nerve damage. * **Option D:** While hemophilia is a genetic condition, it is not strictly "congenital" in the sense of being present at birth in all cases. Approximately **30% of cases arise from de novo mutations** (no family history). Furthermore, clinical symptoms often appear later when the child becomes mobile (toddler stage). *Note: In the context of this specific MCQ, Option B is the most definitive physiological characteristic.* **High-Yield Clinical Pearls for NEET-PG:** * **Lab Profile:** Prolonged aPTT, **Normal** Bleeding Time (BT), **Normal** PT, and **Normal** Platelet count. * **Most Common Site of Bleeding:** Hemarthrosis (specifically the **Knee joint**) [1]. * **Treatment:** Factor replacement is the mainstay [1]. For mild Hemophilia A, **Desmopressin (DDAVP)** can be used to release stored Factor VIII from Weibel-Palade bodies [1].

Question 128: What is the best diagnostic test for Thalassemia?

A. Hemoglobin F (HbF) (Correct Answer)
B. Hemoglobin A2 (HbA2)
C. Serum iron levels
D. Reticulocyte count

Explanation: **Explanation:** The diagnosis of Thalassemia relies on identifying abnormal proportions of hemoglobin variants [3]. While the question asks for the "best" diagnostic test, it is specifically referring to the definitive identification of **Beta-Thalassemia Major**, where **Hemoglobin F (HbF)** is the hallmark finding [2]. * **Why HbF is correct:** In Beta-Thalassemia Major (Cooley’s Anemia), there is a near-total absence of beta-globin chain synthesis [1]. Consequently, Hemoglobin A (α2β2) cannot be formed. The body compensates by continuing to produce Gamma chains, which combine with Alpha chains to form **HbF (α2γ2)** [2]. In these patients, HbF levels are characteristically elevated to **70–90%**, making it the most definitive diagnostic marker on electrophoresis. * **Why HbA2 is incorrect:** HbA2 (α2δ2) is the primary diagnostic marker for **Beta-Thalassemia Trait (Minor)**, where it is typically elevated above 3.5%. In Thalassemia Major, HbA2 levels can be variable or even low. * **Why Serum Iron is incorrect:** Serum iron is usually normal or elevated in Thalassemia. This test is primarily used to differentiate Thalassemia from **Iron Deficiency Anemia (IDA)**, where iron levels are low. * **Why Reticulocyte Count is incorrect:** While elevated in Thalassemia due to compensatory erythropoiesis, it is a non-specific marker of hemolysis and does not provide a definitive diagnosis. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Hemoglobin Electrophoresis or HPLC (High-Performance Liquid Chromatography) [3]. * **Mentzer Index:** (MCV/RBC count) < 13 suggests Thalassemia; > 13 suggests Iron Deficiency Anemia. * **Peripheral Smear:** Shows microcytic hypochromic anemia with characteristic **Target Cells** and nucleated RBCs. * **Confirmatory Test:** Genetic testing (Globin chain analysis) is the definitive method to identify specific mutations.

Question 129: A 40-year-old man has megaloblastic anemia and early signs of neurological abnormality. What is the most probable drug required?

A. Folic acid
B. Iron sulfate
C. Erythropoietin
D. Vitamin B12 (Correct Answer)

Explanation: The clinical presentation of **megaloblastic anemia** combined with **neurological symptoms** is the classic hallmark of **Vitamin B12 (Cobalamin) deficiency**. **1. Why Vitamin B12 is Correct:** Vitamin B12 is essential for two critical enzymatic reactions: * **DNA Synthesis:** It acts as a cofactor for methionine synthase. Deficiency leads to "folate trapping," causing impaired DNA synthesis and megaloblastic changes in rapidly dividing cells (bone marrow) [1]. * **Myelin Maintenance:** It is a cofactor for methylmalonyl-CoA mutase. Deficiency leads to an accumulation of methylmalonic acid (MMA), which results in the demyelination of the posterior and lateral columns of the spinal cord (**Subacute Combined Degeneration**). This explains the "neurological abnormality" mentioned in the question. **2. Why Other Options are Incorrect:** * **Folic Acid:** While folate deficiency also causes megaloblastic anemia, it **does not** cause neurological deficits [1]. Importantly, treating B12 deficiency with folate alone can improve the anemia but will **exacerbate or precipitate irreversible neurological damage**. * **Iron Sulfate:** Used for microcytic hypochromic anemia (Iron Deficiency Anemia), not megaloblastic anemia. * **Erythropoietin:** Used primarily for anemia of chronic kidney disease; it does not address the underlying nutritional deficiency in megaloblastic anemia. **NEET-PG High-Yield Pearls:** * **Diagnostic Test:** Increased levels of **Methylmalonic Acid (MMA)** and **Homocysteine** are seen in B12 deficiency. (In Folate deficiency, only Homocysteine is elevated). * **Neurological triad:** Loss of vibration/position sense, spastic ataxia, and upper motor neuron signs. * **Schilling Test:** Historically used to determine the cause of B12 malabsorption (e.g., Pernicious Anemia). * **Peripheral Smear:** Look for macro-ovalocytes and **hypersegmented neutrophils** (>5 lobes).

Question 130: In a patient with iron deficiency anemia undergoing iron therapy, what is considered an adequate rate of hemoglobin level increase per week?

A. 0.05-0.1 g/dL per week
B. 0.1-0.2 g/dL per week
C. 0.5-1.0 g/dL per week (Correct Answer)
D. More than 1.0 g/dL per week

Explanation: **Explanation:** The goal of iron replacement therapy in Iron Deficiency Anemia (IDA) is to restore hemoglobin levels and replenish iron stores. When a patient is started on oral or parenteral iron, the bone marrow requires time to process the iron and produce new erythrocytes. **Why Option C is correct:** In a patient responding adequately to iron therapy, the **hemoglobin (Hb) level typically rises by 0.5 to 1.0 g/dL per week**. A significant reticulocytosis (the first sign of response) usually peaks between days 7 and 10, followed by a steady rise in hemoglobin. If the Hb does not increase by at least 2 g/dL within 3 weeks, the clinician should investigate for non-compliance, ongoing blood loss, or malabsorption. **Why other options are incorrect:** * **Options A & B:** These rates are too slow. An increase of less than 0.5 g/dL per week suggests an inadequate response, potentially due to an incorrect diagnosis (e.g., Thalassemia or Anemia of Chronic Disease) or poor absorption [1]. * **Option D:** While some patients may show a rapid initial jump, a sustained increase of >1.0 g/dL per week is generally not the standard expectation for oral therapy. **High-Yield Clinical Pearls for NEET-PG:** * **First sign of response:** Increase in **Reticulocyte count** (starts in 3–5 days, peaks at 7–10 days). * **Hb normalization:** Usually occurs within 6–8 weeks of therapy. * **Duration of therapy:** Iron should be continued for **3–6 months** after Hb normalizes to replenish **Ferritin stores** [2]. * **Oral Iron Absorption:** Best absorbed on an empty stomach; Vitamin C (Ascorbic acid) enhances absorption, while tea, calcium, and antacids inhibit it.

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Anemia Evaluation and Management

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Hemoglobinopathies

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Thalassemias

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Platelet Disorders

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Coagulation Disorders

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Thrombotic Disorders

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Leukemias

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Lymphomas

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Multiple Myeloma and Plasma Cell Disorders

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Myeloproliferative Neoplasms

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Transfusion Medicine

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Hematopoietic Stem Cell Transplantation

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Hematology — MCQs

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