Hematology — MCQs

A 45-year-old female patient presents with symptoms of easy bruisability and frequent headaches. Physical examination shows moderate splenomegaly. Blood counts show a normal leucocyte count and a platelet count of 1000 × 10^3/cu mm. The leucocyte alkaline phosphatase score is normal. Which one of the following is the drug of choice for the treatment of this patient?

Q309Easy

Which of the following is a characteristic feature of fetal red blood cells?

Q310Medium

All of the following are true about oral iron therapy in anemia except:

Hematology Indian Medical PG Practice Questions and MCQs

Question 301: Splenomegaly is least likely associated with which of the following conditions?

A. Chronic myeloid leukemia (CML)
B. Polycythemia ruba vera
C. Idiopathic myelofibrosis
D. Primary thrombocytosis (Correct Answer)

Explanation: **Explanation:** The question tests the ability to differentiate between various **Myeloproliferative Neoplasms (MPNs)** based on their clinical presentation, specifically the degree of splenic involvement. **1. Why Primary Thrombocytosis (Essential Thrombocythemia) is the correct answer:** In Essential Thrombocythemia (ET), the primary pathology is the overproduction of platelets. While mild splenomegaly can occur in about 25–40% of patients, it is **least likely** to be a prominent feature compared to other MPNs. In fact, many patients with ET may eventually develop **splenic atrophy** or "autosplenectomy" due to repeated silent splenic infarctions caused by microvascular thrombosis. **2. Analysis of Incorrect Options:** * **Chronic Myeloid Leukemia (CML):** Splenomegaly is a hallmark feature, present in over 50–70% of cases. It is often massive, especially in the accelerated or blast phase. * **Polycythemia Vera (PV):** Splenomegaly is a common finding (approx. 70% of patients) due to extramedullary hematopoiesis and increased red cell mass. * **Idiopathic Myelofibrosis (Primary Myelofibrosis):** This condition is associated with the **most massive splenomegaly** among all MPNs. As the bone marrow becomes fibrotic, the spleen becomes the primary site of extramedullary hematopoiesis. **Clinical Pearls for NEET-PG:** * **Massive Splenomegaly (Spleen crossing midline/reaching iliac crest):** Remember the mnemonic **"M-C-I"** — **M**yelofibrosis, **C**ML, and **I**nfectious (Kala-azar/Malaria) or **I**nherited (Gaucher’s). * **JAK2 Mutation:** Present in >95% of PV cases and ~50% of ET and Myelofibrosis cases. * **Diagnostic Clue:** If a patient has a platelet count >600,000/µL but a **normal-sized spleen**, think of Essential Thrombocythemia over other MPNs.

Question 302: Which of the following is NOT caused by sickle cell trait?

A. Anemia
B. Leg ulcers (Correct Answer)
C. Normal osmotic fragility
D. None of the above

Explanation: **Explanation:** The core concept to understand for NEET-PG is the clinical distinction between **Sickle Cell Trait (HbAS)** and **Sickle Cell Disease (HbSS)**. **Why Leg Ulcers is the correct answer:** Leg ulcers are a classic complication of **Sickle Cell Disease (HbSS)**, occurring in approximately 10-20% of patients due to chronic hemolysis, decreased nitric oxide bioavailability, and vaso-occlusion leading to ischemia [1]. In contrast, **Sickle Cell Trait (HbAS)** is generally a benign, asymptomatic carrier state. Individuals with HbAS have enough normal Hemoglobin A to prevent red cell sickling under physiological conditions; therefore, they do not develop chronic complications like leg ulcers, dactylitis, or splenic infarction (except under extreme hypoxia) [1]. **Analysis of other options:** * **Anemia:** Patients with Sickle Cell Trait typically have a **normal hemoglobin level** and a normal peripheral smear [1]. They do not suffer from chronic hemolytic anemia. Since the question asks what is *not* caused by the trait, and the trait does not cause anemia, this option is technically plausible, but "Leg Ulcers" is the more specific, classically tested "negative" finding for HbAS in medical exams. * **Normal Osmotic Fragility:** This is a **characteristic finding** in Sickle Cell Trait. Because the RBCs in HbAS are not chronically dehydrated or spherocytic, their osmotic fragility remains within the normal range. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common complication of HbAS:** Isosthenuria (inability to concentrate urine) leading to nocturia and polyuria. 2. **Most common "visible" sign of HbAS:** Episodic painless **hematuria** (due to papillary necrosis in the renal medulla). 3. **Hb Electrophoresis in Trait:** Typically shows HbA (55-60%), HbS (40-45%), and normal HbF [1]. 4. **Risk Factor:** Individuals with HbAS are at an increased risk of **Splenic Infarction** only when exposed to extreme conditions (e.g., high-altitude flying in unpressurized aircraft or strenuous exercise).

Question 303: Which of the following findings is NOT seen in iron deficiency anemia?

A. Hypersegmented neutrophils (Correct Answer)
B. Microcytosis precedes hypochromia
C. MCHC < 50%
D. Commonest cause of anemia in India

Explanation: **Explanation:** **1. Why Option A is the Correct Answer:** **Hypersegmented neutrophils** (defined as $\geq$ 5% of neutrophils with 5 lobes or a single neutrophil with $\geq$ 6 lobes) are a hallmark of **Megaloblastic Anemia** (Vitamin B12 or Folate deficiency) [1]. They occur due to impaired DNA synthesis leading to nuclear-cytoplasmic dyssynchrony. In contrast, Iron Deficiency Anemia (IDA) is a disorder of heme synthesis, not DNA synthesis, and typically presents with a normal or slightly reduced neutrophil count without hypersegmentation. **2. Analysis of Incorrect Options:** * **Option B (Microcytosis precedes hypochromia):** This is a classic physiological sequence in IDA [3]. As iron stores deplete, the Mean Corpuscular Volume (MCV) drops first (microcytosis) as the marrow attempts to maintain hemoglobin concentration. Only when the deficiency worsens does the Mean Corpuscular Hemoglobin Concentration (MCHC) fall (hypochromia). * **Option C (MCHC < 30%):** In IDA, the MCHC typically falls below the normal range (32–36%). While the option says < 50%, which is technically true for almost all anemias, in the context of IDA, a low MCHC (hypochromia) is a defining feature. * **Option D (Commonest cause of anemia in India):** Nutritional Iron Deficiency remains the most prevalent cause of anemia across all age groups and genders in India, making this a true statement [2]. **Clinical Pearls for NEET-PG:** * **Earliest sign of IDA:** Decreased **Serum Ferritin** (reflects depleted stores) [1]. * **Earliest peripheral blood change:** Increased **RDW** (Red Cell Distribution Width). * **Pencil cells (Elliptocytes):** Frequently seen on the peripheral smear of IDA patients. * **Mentzer Index:** (MCV/RBC count) < 13 suggests Thalassemia trait; > 13 suggests IDA.

Question 304: Which of the following blood group systems is characterized by carbohydrate antigens?

A. Rh
B. Kell
C. Lewis (Correct Answer)
D. Duffy

Explanation: **Explanation:** Blood group antigens are biochemically classified into two main categories: **Carbohydrates** (sugars) and **Proteins** [3]. **Why Lewis is Correct:** The **Lewis (Le) system** consists of carbohydrate antigens. Unlike most other systems, Lewis antigens are not synthesized by the red cell membrane itself. Instead, they are carbohydrate chains produced in secretions (by epithelial cells) and subsequently adsorbed from the plasma onto the red blood cell surface. Other major carbohydrate-based systems include **ABO, H, and P.** [1], [3] **Why the others are Incorrect:** * **Rh System (Option A):** These are complex **transmembrane proteins** [3]. They are highly immunogenic (especially the D antigen) and do not have a carbohydrate component. * **Kell System (Option B):** These are **single-pass transmembrane glycoproteins**. The Kell protein is large and highly folded via disulfide bonds. * **Duffy System (Option C):** These are **multipass transmembrane proteins** that act as receptors for chemokines and are the binding site for *Plasmodium vivax*. **NEET-PG High-Yield Pearls:** 1. **Biochemical Nature:** * **Carbohydrate Antigens:** ABO, Lewis, P, H, I [1], [2]. * **Protein Antigens:** Rh, Kell, Duffy, Kidd, MNS [3]. 2. **Lewis & Pregnancy:** Lewis antigen expression often decreases during pregnancy (transient Le(a-b-) phenotype), which can lead to the development of transient Lewis antibodies. 3. **Duffy & Malaria:** Individuals who are Duffy-negative [Fy(a-b-)] are resistant to **Plasmodium vivax** malaria, a common finding in African populations. 4. **Kell & HDN:** Anti-Kell is a common cause of severe Hemolytic Disease of the Newborn (HDN) because it suppresses fetal erythropoiesis in addition to causing hemolysis.

Question 305: What is the differential diagnosis for thrombotic microangiopathic anemia?

A. Sepsis
B. Hemolytic uremic syndrome (Correct Answer)
C. Myocardial infarction
D. Eclampsia

Explanation: Detailed Analysis: **Thrombotic Microangiopathy (TMA)** is a clinical syndrome characterized by the triad of **Microangiopathic Hemolytic Anemia (MAHA)**, thrombocytopenia, and organ damage due to microvascular thrombosis [1]. On a peripheral smear, the hallmark finding is the presence of **schistocytes** (fragmented RBCs). **Why Hemolytic Uremic Syndrome (HUS) is correct:** HUS is a classic example of TMA [3]. It typically involves the formation of platelet-rich hyaline thrombi in the renal microvasculature. It is categorized into **Typical HUS** (caused by Shiga toxin-producing *E. coli* O157:H7) and **Atypical HUS** (complement-mediated) [1]. Both present with the classic TMA triad, specifically targeting the kidneys. **Analysis of Incorrect Options:** * **Sepsis:** While sepsis can lead to Disseminated Intravascular Coagulation (DIC) [2], it is not primarily classified as a TMA. In DIC, there is a consumption of clotting factors (prolonged PT/aPTT), whereas, in primary TMAs like HUS or TTP, the coagulation profile is usually normal [2]. * **Myocardial Infarction:** This is a macrovascular thrombotic event involving coronary arteries, not a microangiopathic process involving hemolytic anemia. * **Eclampsia:** While severe preeclampsia/HELLP syndrome can cause TMA-like features, it is considered a secondary cause. Among the options, HUS is the definitive, textbook prototype for TMA. **High-Yield Clinical Pearls for NEET-PG:** * **The Pentad of TTP:** Fever, Anemia (MAHA), Thrombocytopenia, Neurological symptoms, and Renal failure (**Mnemonic: FAT RN**). * **HUS vs. TTP:** HUS is predominantly renal (common in children); TTP is predominantly neurological (associated with **ADAMTS13 deficiency**). * **Lab Hallmark:** Negative Direct Coombs test (as the hemolysis is mechanical, not immune-mediated) and elevated LDH. * **Treatment:** Plasmapheresis (Plasma Exchange) is the treatment of choice for TTP; supportive care/dialysis for typical HUS.

Question 306: Disseminated intravascular coagulation can occur in all of the following conditions except:

A. Hemophilia (Correct Answer)
B. Snakebite
C. Placenta previa
D. Falciparum malaria

Explanation: **Explanation:** **Disseminated Intravascular Coagulation (DIC)** is a thrombohemorrhagic disorder characterized by the systemic activation of the coagulation cascade, leading to widespread fibrin deposition and the subsequent consumption of clotting factors and platelets [1]. **Why Hemophilia is the correct answer:** Hemophilia (A or B) is a **hereditary deficiency** of specific clotting factors (Factor VIII or IX). It is a "hypocoagulable" state characterized by a failure to form a stable fibrin clot. DIC, conversely, requires a trigger that initiates **excessive thrombin generation**. Because hemophiliacs lack the necessary factors to complete the coagulation cascade efficiently, they do not develop the systemic, runaway intravascular clotting seen in DIC. **Why the other options are incorrect:** * **Snakebite:** Certain venoms (e.g., Russell’s viper) contain procoagulant enzymes that directly activate Factor X or Prothrombin, triggering rapid DIC. * **Placenta Previa:** Obstetric complications are classic triggers for DIC [1]. The release of **Tissue Factor (Thromboplastin)** from the placenta or decidua into the maternal circulation initiates the extrinsic pathway. * **Falciparum Malaria:** Severe malaria causes DIC through infected erythrocyte adhesion to endothelium, leading to microvascular stasis, endothelial damage, and the release of procoagulant cytokines (TNF-α) [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of DIC:** Sepsis (Gram-negative organisms due to endotoxins) [1]. 2. **Best screening test:** Increased **D-dimer** (indicates fibrinolysis) and prolonged PT/aPTT [1]. 3. **Peripheral Smear:** Look for **Schistocytes** (fragmented RBCs) due to microangiopathic hemolytic anemia (MAHA). 4. **Acute Promyelocytic Leukemia (M3):** A high-yield hematological malignancy strongly associated with DIC due to the release of procoagulant granules.

Question 307: A low mean corpuscular volume with a normal red cell distribution width suggests which of the following?

A. Iron deficiency anaemia
B. Alpha thalassaemia trait (Correct Answer)
C. Anaemia of chronic disease
D. Sideroblastic anaemia

Explanation: ### Explanation The key to solving this question lies in understanding the **Red Cell Distribution Width (RDW)**, which measures the variation in red blood cell size (anisocytosis). **1. Why Alpha Thalassaemia Trait is Correct:** In Thalassaemia traits (both Alpha and Beta), there is a genetic defect in globin chain synthesis [1]. This results in the production of red blood cells that are **uniformly small (microcytic)**. Because the cells are consistently small across the entire population, the **MCV is low**, but the **RDW remains normal**. This "homogenous microcytosis" is a classic hallmark used to differentiate Thalassaemia from Iron Deficiency Anemia (IDA). **2. Analysis of Incorrect Options:** * **Iron Deficiency Anaemia (IDA):** This is the most common cause of microcytic anemia [3]. However, as iron stores deplete, the marrow produces cells of varying sizes, leading to a **high RDW**. IDA is characterized by "heterogenous microcytosis." * **Anaemia of Chronic Disease (ACD):** While ACD can be microcytic, it is more commonly **normocytic with a normal RDW** [2]. If it becomes microcytic, the RDW may stay normal, but Thalassaemia trait is a more classic representation of the "Low MCV + Normal RDW" pattern in exam scenarios. * **Sideroblastic Anaemia:** This condition typically features a dimorphic cell population (small pale cells and normal cells), which significantly **increases the RDW**. **3. Clinical Pearls for NEET-PG:** * **Mentzer Index:** Used to differentiate IDA from Thalassaemia. * **MCV/RBC count < 13** suggests Thalassaemia. * **MCV/RBC count > 13** suggests IDA. * **RDW** is the first parameter to change (increase) in early nutritional anemias (Iron, B12, or Folate deficiency) even before the MCV becomes abnormal. * **High-Yield Rule:** Microcytosis + Normal RDW = Thalassaemia trait or ACD. Microcytosis + High RDW = Iron Deficiency Anemia.

Question 308: A 45-year-old female patient presents with symptoms of easy bruisability and frequent headaches. Physical examination shows moderate splenomegaly. Blood counts show a normal leucocyte count and a platelet count of 1000 × 10^3/cu mm. The leucocyte alkaline phosphatase score is normal. Which one of the following is the drug of choice for the treatment of this patient?

A. Hydroxyurea (Correct Answer)
B. Radioactive phosphorus
C. Anagrelide
D. Interferon alpha

Explanation: The patient presents with a significantly elevated platelet count (1000 × 10³/cu mm), splenomegaly, and symptoms of vasomotor instability (headaches) and bleeding (bruisability). Given the normal leucocyte count and normal LAP score (which rules out CML), the most likely diagnosis is **Essential Thrombocythemia (ET)**. **1. Why Hydroxyurea is the Correct Answer:** Hydroxyurea is the **first-line myelosuppressive agent** for high-risk ET patients (defined as age >60 years or a history of thrombosis/bleeding). It effectively lowers the platelet count, reduces the risk of thrombotic events, and is generally well-tolerated. In this patient, the presence of symptoms and a very high platelet count necessitates cytoreductive therapy, and Hydroxyurea remains the gold standard. **2. Why the Other Options are Incorrect:** * **Radioactive Phosphorus (P³²):** While effective, it is associated with a high risk of transformation into Acute Myeloid Leukemia (AML) and is now rarely used. * **Anagrelide:** This is a second-line agent. While it specifically lowers platelets, it is less effective than Hydroxyurea in preventing arterial thrombosis and carries side effects like palpitations and fluid retention. * **Interferon-alpha:** Usually reserved for pregnant patients or those refractory to Hydroxyurea due to its significant side-effect profile (flu-like symptoms, depression). **Clinical Pearls for NEET-PG:** * **Diagnosis of ET:** Requires platelets >450 × 10³/cu mm and the presence of a driver mutation (**JAK2 V617F** in ~55%, **CALR**, or **MPL**). * **LAP Score:** Used to differentiate Leukemoid reaction (High) from CML (Low). A normal score here points away from CML. * **Treatment Goal:** In ET, the goal is to maintain platelets <400 × 10³/cu mm to prevent thrombosis and paradoxical bleeding (due to acquired von Willebrand syndrome at very high platelet counts).

Question 309: Which of the following is a characteristic feature of fetal red blood cells?

A. Resistant to alkali denaturation (Correct Answer)
B. Small in size
C. Has a higher 2,3-DPG level
D. Contains more iron than adult RBCs

Explanation: **Explanation:** The correct answer is **A. Resistant to alkali denaturation.** **1. Why Option A is Correct:** Fetal hemoglobin (HbF, $\alpha_2\gamma_2$) is structurally different from adult hemoglobin (HbA, $\alpha_2\beta_2$). The presence of gamma ($\gamma$) chains makes HbF significantly more resistant to denaturation by strong alkaline solutions (like KOH). This biochemical property is the basis of the **Apt test**, used clinically to differentiate fetal blood from maternal blood in cases of neonatal gastrointestinal bleeding or vaginal bleeding during pregnancy [1]. **2. Why Other Options are Incorrect:** * **B. Small in size:** Fetal RBCs are actually **macrocytic**. At birth, the Mean Corpuscular Volume (MCV) is high (approx. 105–120 fL) and gradually decreases to adult levels over the first year of life. * **C. Higher 2,3-DPG level:** HbF has a **lower affinity for 2,3-DPG** because the $\gamma$-chain lacks certain positively charged amino acids found in the $\beta$-chain [2]. This reduced binding results in a **higher oxygen affinity**, allowing the fetus to "pull" oxygen from maternal circulation [2]. * **D. Contains more iron:** While newborns have high hemoglobin levels, the individual RBC does not contain "more iron" as a structural feature; iron content is proportional to hemoglobin concentration, which is regulated similarly to adults. **Clinical Pearls for NEET-PG:** * **P50 Value:** HbF has a lower P50 (approx. 19 mmHg) compared to HbA (27 mmHg), reflecting its higher oxygen affinity (Left shift of the curve). * **Kleihauer-Betke Test:** Uses the principle of acid elution (HbF resists acid elution while HbA is washed out) to quantify fetal-maternal hemorrhage [1]. * **HbF Switch:** HbF is the predominant hemoglobin from the 8th week of gestation until birth [2]. It is replaced by HbA within the first 6 months of life.

Question 310: All of the following are true about oral iron therapy in anemia except:

A. May worsen inflammatory bowel disease
B. It takes a minimum of 2 weeks for reticulocyte count to increase (Correct Answer)
C. Generally, 3-6 months of therapy is required to replenish iron stores
D. Gastrointestinal side-effects often limit its dose

Explanation: **Explanation:** **1. Why Option B is the Correct Answer (The False Statement):** The response to oral iron therapy is relatively rapid. After initiating iron supplementation, the **reticulocyte count begins to rise within 3 to 5 days** and typically peaks between **7 to 10 days**. Waiting for 2 weeks to see the initial rise is clinically inaccurate; by day 14, the hemoglobin level itself should already show a measurable increase (usually ~1–2 g/dL by week 3). **2. Analysis of Incorrect Options (True Statements):** * **Option A:** Oral iron can be pro-inflammatory. Unabsorbed iron in the gut lumen can cause oxidative stress and alter the gut microbiota, which may **exacerbate symptoms of Inflammatory Bowel Disease (IBD)** [1]. In such patients, IV iron is often preferred. * **Option B:** Oral iron therapy is often associated with hepcidin upregulation due to inflammation-mediated pathways [2]. * **Option C:** While hemoglobin may normalize within 2 months, therapy must continue for **3–6 months** to replenish the body’s **iron stores (ferritin)**. * **Option D:** GI side effects (nausea, epigastric pain, constipation, or diarrhea) occur in up to 25% of patients. These are **dose-dependent** and are the primary reason for poor compliance and dose limitation. **Clinical Pearls for NEET-PG:** * **First sign of response:** Subjective improvement in well-being (within 24–48 hours). * **First hematological sign:** Increase in reticulocyte count (Peak: 7–10 days). * **Best parameter to monitor response:** Hemoglobin (expected rise of 0.7–1.0 g/dL per week). * **Absorption:** Best absorbed on an empty stomach or with Vitamin C; inhibited by tea, antacids, and calcium. * **Current Trend:** Alternate-day dosing is now often recommended to reduce hepcidin induction and improve absorption/tolerance [2].

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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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