Hematology — MCQs

A nine-month-old boy presented with progressive lethargy, irritability, and pallor since 6 months of age. Examination revealed severe pallor. Investigations showed Hb: 3.8 mg/dL; MCV: 58 fL; MCH: 19.4 pg/cell. Blood film shows target cells and normoblasts, with normal osmotic fragility. X-ray skull shows expansion of the erythroid marrow. Which of the following is the most likely diagnosis?

Q760Medium

Which of the following conditions is caused by deletion of all four alpha globin genes?

Hematology Indian Medical PG Practice Questions and MCQs

Question 751: A patient with anemia presents with peripheral blood smear showing features suggestive of thalassemia. Family history is positive. Which investigation is most appropriate to establish the diagnosis?

A. Erythrocyte Sedimentation Rate (ESR) estimation
B. Blood spherocyte estimation
C. Bone marrow aspiration
D. Hemoglobin (Hb) electrophoresis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of anemia, a positive family history, and a peripheral smear showing microcytic hypochromic cells with target cells strongly suggests a **Thalassemia syndrome**. **1. Why Hemoglobin (Hb) Electrophoresis is correct:** Hb electrophoresis is the **gold standard diagnostic test** for thalassemia. It works by separating different hemoglobin fractions (HbA, HbA2, and HbF) based on their electrical charge. * In **Beta-thalassemia trait**, there is a characteristic elevation of **HbA2 (>3.5%)** and sometimes HbF. [1] * In **Beta-thalassemia major**, HbA is nearly absent, replaced predominantly by HbF. * High-Performance Liquid Chromatography (HPLC) is an even more modern, automated alternative often used in clinical practice. **2. Why other options are incorrect:** * **ESR estimation:** This is a non-specific marker of inflammation and has no diagnostic value in hemoglobinopathies. * **Blood spherocyte estimation:** Spherocytes are characteristic of Hereditary Spherocytosis or Autoimmune Hemolytic Anemia, not Thalassemia (which shows target cells and leptocytes). [2] * **Bone marrow aspiration:** While it would show erythroid hyperplasia, it is an invasive procedure and cannot differentiate between various causes of microcytic anemia or confirm a genetic hemoglobin defect. [1] **Clinical Pearls for NEET-PG:** * **Mentzer Index:** (MCV/RBC count) <13 suggests Thalassemia; >13 suggests Iron Deficiency Anemia. * **Peripheral Smear:** Look for "Target cells" (Codocytes) and "Basophilic stippling." [1] * **Confirmatory Test:** While electrophoresis is diagnostic for Beta-thalassemia, **Genetic testing (PCR)** is required to definitively diagnose Alpha-thalassemia.

Question 752: In which of the following age groups are myelodysplastic syndromes (MDS) most common?

A. 10-20 years
B. 20-30 years
C. 30-50 years
D. >50 years (Correct Answer)

Explanation: Myelodysplastic Syndromes (MDS) are a group of clonal hematopoietic stem cell disorders characterized by cytopenia, ineffective hematopoiesis, and a risk of transformation into Acute Myeloid Leukemia (AML). **Why Option D is Correct:** MDS is primarily a disease of the **elderly**. The underlying pathophysiology involves the cumulative acquisition of somatic mutations in hematopoietic stem cells over time. The median age at diagnosis is approximately **70 years**, and the incidence increases exponentially after the age of 50. Therefore, **>50 years** is the most appropriate age group among the choices. **Why Other Options are Incorrect:** * **Options A & B (10–30 years):** MDS is extremely rare in children and young adults. When it does occur in these age groups, it is often associated with inherited bone marrow failure syndromes (e.g., Fanconi anemia) or prior exposure to chemotherapy/radiation (therapy-related MDS). * **Option C (30–50 years):** While the incidence begins to rise slightly in the late 40s, it remains significantly lower than in the geriatric population. **Clinical Pearls for NEET-PG:** * **Peripheral Smear:** Characterized by **Pseudo-Pelger-Huët anomaly** (hyposegmented, bilobed neutrophils) and macrocytic anemia. * **Bone Marrow:** Hypercellular marrow with "dysplastic" changes (e.g., ring sideroblasts, micromegakaryocytes). * **Cytogenetics:** The most common chromosomal abnormality is **5q deletion (5q- syndrome)**, which typically carries a better prognosis and responds well to **Lenalidomide**. * **Transformation:** MDS is often referred to as "pre-leukemia" because of its high propensity to evolve into AML (specifically when blasts in the marrow reach ≥20%).

Question 753: Which of the following is not a feature of megaloblastic anemia?

A. Thrombocytopenia
B. Megakaryocytes
C. Reticulocytosis (Correct Answer)
D. Howell-Jolly bodies

Explanation: ### Explanation **Megaloblastic Anemia** is characterized by **ineffective erythropoiesis** due to impaired DNA synthesis (most commonly Vitamin B12 or Folate deficiency). This leads to a "nuclear-cytoplasmic asynchrony" where the nucleus matures slower than the cytoplasm [1]. #### Why Reticulocytosis is the Correct Answer: In megaloblastic anemia, there is a **low reticulocyte count (Reticulocytopenia)**. Because the bone marrow cannot produce mature red blood cells effectively due to defective DNA synthesis and intramedullary hemolysis, the output of new reticulocytes into the peripheral blood is significantly decreased. **Reticulocytosis** (an increase in reticulocytes) only occurs *after* treatment with B12 or Folate has commenced, signaling a therapeutic response. #### Analysis of Other Options: * **A. Thrombocytopenia:** Severe megaloblastic anemia often presents as **pancytopenia** (anemia, leucopenia, and thrombocytopenia) [1] because DNA synthesis is impaired across all hematopoietic cell lines. * **B. Megakaryocytes:** While the number of megakaryocytes in the marrow may be normal or increased, they often show **abnormal morphology** (hypersegmentation of nuclei), mirroring the megaloblastic changes seen in the erythroid series. * **C. Howell-Jolly Bodies:** These are nuclear remnants (DNA clusters) in circulating RBCs. They are a classic peripheral smear finding in megaloblastic anemia, reflecting the disordered nuclear maturation and sluggish splenic clearance. #### NEET-PG High-Yield Pearls: * **Peripheral Smear:** Look for **Macro-ovalocytes** and **Hypersegmented neutrophils** (earliest sign; >5% of neutrophils with 5 lobes or one with 6 lobes). * **Bone Marrow:** Hypercellular marrow with "sieve-like" chromatin in erythroid precursors. * **Biochemical Markers:** Elevated **LDH** and **Indirect Bilirubin** (due to ineffective erythropoiesis/intramedullary hemolysis). * **Specific Test:** Elevated **Methylmalonic acid (MMA)** is specific for Vitamin B12 deficiency [3], whereas **Homocysteine** is elevated in both B12 and Folate deficiency [2].

Question 754: A 40-year-old male has Hb-10 gm%, MCV-65 fL, RDW-16%, platelet count 4.5 lac/pt. What additional finding would be expected?

A. Low serum transferrin
B. Total iron-binding capacity (Correct Answer)
C. Total serum copper
D. Serum ferritin

Explanation: ### Explanation The clinical presentation points toward **Iron Deficiency Anemia (IDA)**. The patient has anemia (Hb 10 gm%), microcytosis (MCV 65 fL) [2], an increased Red Cell Distribution Width (RDW 16%), and reactive thrombocytosis (Platelets 4.5 lac/µL)—a classic tetrad for IDA. #### 1. Why the Correct Answer is Right In IDA, the body’s iron stores are depleted [1]. To compensate and maximize the capture of any available iron, the liver increases the synthesis of **Transferrin** (the transport protein). **Total Iron Binding Capacity (TIBC)** is a direct measurement of the total available binding sites on transferrin. Therefore, in IDA, **TIBC is characteristically elevated**. This is the most expected finding among the options provided to confirm the diagnosis. #### 2. Analysis of Incorrect Options * **A. Low serum transferrin:** Incorrect. Transferrin levels (and thus TIBC) **increase** in IDA [1]. Low transferrin is seen in Anemia of Chronic Disease (ACD) [1] or protein-malnutrition states. * **C. Total serum copper:** Incorrect. While copper deficiency can cause microcytic anemia (Sideroblastic), it is rare and not suggested by the high RDW and thrombocytosis seen here. * **D. Serum ferritin:** Incorrect as an "additional finding" in this context because, in IDA, ferritin would be **low**, not high or normal. While it is the most sensitive initial test, the question asks for an expected finding; an elevated TIBC is a hallmark physiological response. #### 3. NEET-PG High-Yield Pearls * **RDW:** The earliest sign of IDA is an increase in RDW (Anisocytosis), helping differentiate it from Thalassemia (where RDW is usually normal/Mentzer index <13). * **Reactive Thrombocytosis:** Common in IDA; iron is an inhibitor of thrombopoiesis, so its absence leads to increased platelet production. * **Gold Standard:** Bone marrow iron staining (Prussian blue) is the gold standard, showing absent haemosiderin, but **Serum Ferritin <15-30 ng/mL** is the best non-invasive test. * **TIBC vs. Ferritin:** In IDA, TIBC is **High** and Ferritin is **Low**. In Anemia of Chronic Disease, TIBC is **Low/Normal** and Ferritin is **High/Normal** [3].

Question 755: What does the acronym 'POEMS' stand for?

A. Oesophageal dysmotility
B. Polyneuropathy (Correct Answer)
C. Endocrinopathy
D. M-protein

Explanation: POEMS syndrome is a rare multisystemic disorder caused by an underlying plasma cell dyscrasia. The acronym is a clinical mnemonic used to identify the five hallmark features of the disease. **The acronym 'POEMS' stands for:** * **P – Polyneuropathy:** Typically a chronic, progressive, symmetrical sensorimotor polyradiculoneuropathy (similar to CIDP). This is often the presenting and most disabling feature. * **O – Organomegaly:** Specifically hepatomegaly, splenomegaly, or lymphadenopathy. * **E – Endocrinopathy:** Most commonly hypothyroidism, hypogonadism, or adrenal insufficiency. * **M – Monoclonal protein (M-protein):** Usually IgA or IgG lambda light chain. * **S – Skin changes:** Such as hyperpigmentation, hypertrichosis, or glomeruloid hemangiomas. **Analysis of Options:** * **Option B (Correct):** Polyneuropathy is the 'P' in the acronym and is a mandatory major diagnostic criterion. * **Option A (Incorrect):** Oesophageal dysmotility is not a component of POEMS; it is more characteristic of systemic sclerosis (Scleroderma). * **Options C & D (Incorrect):** While Endocrinopathy and M-protein are part of the POEMS acronym, the question asks what the acronym stands for in the context of the provided options. Since Polyneuropathy is the primary "P," it is the most accurate answer for this specific question structure. **High-Yield Clinical Pearls for NEET-PG:** 1. **VEGF:** Elevated Vascular Endothelial Growth Factor (VEGF) levels are highly sensitive and specific for POEMS and correlate with disease activity. 2. **Sclerotic Bone Lesions:** Unlike Multiple Myeloma (which has lytic lesions), POEMS is associated with **osteosclerotic** lesions. 3. **Castleman Disease:** A significant proportion of POEMS patients have co-existing Castleman disease. 4. **Mandatory Criteria:** For diagnosis, a patient must have Polyneuropathy AND Monoclonal plasma cell proliferative disorder.

Question 756: In a patient with mild hemophilia, what would be the typical percentage of clotting factor (antihemophilic factor) activity?

A. Above 5% (Correct Answer)
B. Above 10%
C. Above 30%
D. Any of the above

Explanation: Hemophilia (A or B) is an X-linked recessive bleeding disorder caused by a deficiency in Factor VIII or Factor IX [1]. The clinical severity of the disease is directly correlated with the plasma level of the deficient clotting factor. **1. Why Option A is Correct:** According to the standard classification of hemophilia severity: * **Severe:** <1% of normal factor activity. (Presents with spontaneous joint bleeds/hemarthrosis) [1]. * **Moderate:** 1% to 5% of normal factor activity. (Bleeding occurs with minor trauma). * **Mild:** **>5% to <40%** of normal factor activity. (Bleeding usually occurs only after major trauma or surgery). Since mild hemophilia is defined as activity **above 5%**, Option A is the most accurate threshold for diagnosis. **2. Why Other Options are Incorrect:** * **Option B (Above 10%):** While a patient with 10% activity is indeed "mild," this option is too restrictive. A patient with 6% or 8% activity is also classified as mild, and this option would exclude them. * **Option C (Above 30%):** Normal factor levels range from 50% to 150%. The "mild" category ends at approximately 40%. Setting the threshold at 30% misses a significant portion of the mild hemophilia population (those between 5% and 30%). * **Option D:** Incorrect because the specific diagnostic cutoff for mild hemophilia starts at >5%. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death:** Intracranial hemorrhage. * **Most common site of bleeding:** Knee joint (Hemarthrosis) [1]. * **Lab Findings:** Prolonged **aPTT**, normal PT, normal Bleeding Time, and normal Platelet count. * **Treatment:** Factor replacement is the mainstay [1]. In **Mild Hemophilia A**, **Desmopressin (DDAVP)** can be used to transiently raise Factor VIII levels by releasing it from endothelial stores [2].

Question 757: A 67-year-old woman with a prosthetic aortic valve develops progressive anemia. Examination of a peripheral blood smear reveals reticulocytosis and schistocytes. What is the appropriate diagnosis?

A. Acanthocytosis
B. Henoch-Schönlein purpura
C. Idiopathic thrombocytopenic purpura
D. Macroangiopathic hemolytic anemia (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Macroangiopathic hemolytic anemia (MAHA)** The clinical presentation of a **prosthetic heart valve** combined with **schistocytes** (fragmented RBCs) and **reticulocytosis** (indicating a compensatory bone marrow response to hemolysis) is a classic description of **Waring Blender Syndrome**. **Medical Concept:** This is a form of **Macroangiopathic Hemolytic Anemia**. It occurs due to mechanical trauma as RBCs pass through the turbulent flow or high-pressure gradients created by a prosthetic valve (especially mechanical valves or paravalvular leaks) [1]. The physical impact shears the RBC membranes, leading to intravascular hemolysis and the formation of schistocytes [1]. **Why Incorrect Options are Wrong:** * **A. Acanthocytosis:** Characterized by "spur cells" (irregularly spiked RBCs), typically seen in **Abetalipoproteinemia** or severe liver disease, not mechanical trauma. * **B. Henoch-Schönlein purpura (HSP):** A small-vessel vasculitis presenting with a triad of palpable purpura, arthralgia, and abdominal pain. It does not typically cause mechanical hemolysis. * **C. Idiopathic thrombocytopenic purpura (ITP):** An immune-mediated destruction of platelets. While it causes bleeding, it does not cause RBC fragmentation or schistocytes. **NEET-PG High-Yield Pearls:** * **Schistocytes** are the hallmark of **Micro**angiopathic Hemolytic Anemia (TTP, HUS, DIC) and **Macro**angiopathic Hemolytic Anemia (Prosthetic valves, Aortic stenosis). * In MAHA due to valves, **haptoglobin** will be decreased, and **LDH** will be elevated. * **Iron deficiency anemia** can eventually develop in these patients due to chronic **hemosiderinuria** (loss of iron in urine following intravascular hemolysis).

Question 758: Which of the following infections is most commonly related to aplastic anemia?

A. Hepatitis (Correct Answer)
B. H. pylori infection
C. Tetanus
D. Bacteremia

Explanation: **Explanation:** **Aplastic Anemia (AA)** is a clinical syndrome characterized by pancytopenia resulting from bone marrow hypoplasia. While most cases are idiopathic, viral infections are a well-recognized trigger. **Why Hepatitis is the Correct Answer:** **Post-hepatitic aplastic anemia** is a distinct clinical entity. It typically occurs 2–3 months after an episode of acute hepatitis. Interestingly, in the majority of these cases, the common hepatitis viruses (A, B, C, or E) are **not** the culprits; it is usually caused by unidentified non-A, non-B, non-C, non-E viruses. The pathophysiology involves a T-cell-mediated immune destruction of hematopoietic stem cells triggered by the viral infection. It is often severe and carries a high mortality rate if not treated with bone marrow transplantation or immunosuppressive therapy. **Why Other Options are Incorrect:** * **H. pylori:** This is primarily associated with peptic ulcer disease, gastric MALT lymphoma, and **Immune Thrombocytopenic Purpura (ITP)** or Iron Deficiency Anemia, but not aplastic anemia. * **Tetanus:** Caused by *Clostridium tetani* neurotoxins; it affects the neuromuscular system and has no association with bone marrow failure. * **Bacteremia:** While severe sepsis can cause transient cytopenias or DIC, it does not cause the chronic stem cell failure characteristic of aplastic anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common virus** associated with AA: Non-A, non-B, non-C, non-G hepatitis viruses. * **Other associated viruses:** EBV (Infectious Mononucleosis), CMV, HIV, and Parvovirus B19 (though B19 typically causes **Pure Red Cell Aplasia**, especially in sickle cell patients). * **Drug of choice:** For patients not eligible for transplant, **Antithymocyte Globulin (ATG) + Cyclosporine** is the standard treatment. * **Gold Standard Diagnosis:** Bone marrow biopsy showing hypocellularity and increased fat content ("dry tap").

Question 759: A nine-month-old boy presented with progressive lethargy, irritability, and pallor since 6 months of age. Examination revealed severe pallor. Investigations showed Hb: 3.8 mg/dL; MCV: 58 fL; MCH: 19.4 pg/cell. Blood film shows target cells and normoblasts, with normal osmotic fragility. X-ray skull shows expansion of the erythroid marrow. Which of the following is the most likely diagnosis?

A. Iron deficiency anemia (Correct Answer)
B. Acute lymphoblastic leukemia
C. Hemoglobin D disease
D. Hereditary spherocytosis

Explanation: The clinical presentation of progressive pallor, lethargy, and irritability in a nine-month-old infant, combined with severe microcytic hypochromic anemia (Hb: 3.8 g/dL, MCV: 58 fL, MCH: 19.4 pg), strongly points toward **Iron Deficiency Anemia (IDA)**. **Why IDA is the correct answer:** In infants, IDA typically manifests between 6–24 months as maternal iron stores deplete. The peripheral smear findings of **target cells** and **normoblasts** (nucleated RBCs) are compensatory responses to severe, chronic anemia and hypoxia. The **X-ray skull showing expansion of erythroid marrow** (widening of the diploic space) is a classic sign of compensatory extramedullary or intense intramedullary erythropoiesis, which occurs in severe, long-standing cases of IDA in children, similar to Thalassemia. **Why other options are incorrect:** * **Acute Lymphoblastic Leukemia (ALL):** While it causes pallor and anemia, it usually presents with thrombocytopenia (petechiae), lymphadenopathy, or hepatosplenomegaly, and the anemia is typically normocytic. * **Hemoglobin D Disease:** This is usually asymptomatic or causes very mild hemolytic anemia; it would not explain such severe hemoglobin depletion (3.8 g/dL) or significant marrow expansion. * **Hereditary Spherocytosis:** This presents with **increased** osmotic fragility and spherocytes on the blood film. The question explicitly mentions **normal osmotic fragility**, ruling this out. **NEET-PG High-Yield Pearls:** * **Most common cause** of microcytic hypochromic anemia worldwide: Iron Deficiency Anemia [1]. * **Target cells** are seen in: **HALT** (HbC, Asplenia, Liver disease, Thalassemia) and occasionally severe IDA. * **Skull X-ray:** The "Hair-on-end" appearance is most common in Thalassemia Major but can occur in any severe chronic hemolytic anemia or severe IDA in childhood. * **Mentzer Index (MCV/RBC count):** >13 suggests IDA; <13 suggests Thalassemia trait.

Question 760: Which of the following conditions is caused by deletion of all four alpha globin genes?

A. Beta thalassemia major
B. Hb Bart's (Correct Answer)
C. HbH disease
D. Alpha thalassemia trait

Explanation: The synthesis of alpha-globin chains is controlled by **four genes** (two on each chromosome 16). The clinical severity of alpha-thalassemia depends directly on the number of deleted genes. **1. Why Hb Bart's is correct:** When **all four alpha-globin genes are deleted (--/--)**, no alpha chains are produced. In the fetus, excess gamma ($̳$) chains (which normally pair with alpha) form tetramers ($̳_4$), known as **Hb Bart's**. This hemoglobin has an extremely high affinity for oxygen, making it useless for oxygen delivery to tissues. This leads to severe intrauterine hypoxia, high-output heart failure, and massive edema, a condition known as **Hydrops Fetalis**, which is usually fatal in utero or shortly after birth. **2. Why the other options are incorrect:** * **Beta thalassemia major:** This is caused by mutations in the **beta-globin genes** on chromosome 11, not alpha-globin deletions [1]. * **HbH disease:** This occurs when **three alpha genes** are deleted (--/-̱). The excess beta ($̲$) chains form tetramers ($̲_4$), known as HbH. It presents as a moderately severe hemolytic anemia. * **Alpha thalassemia trait:** This occurs when **two alpha genes** are deleted (either --/̱̱ or -̱/-̱). Patients are usually asymptomatic with mild microcytosis. **High-Yield Pearls for NEET-PG:** * **Hb Bart's:** ̳_4 tetramers (4-gene deletion). * **HbH:** ̲_4 tetramers (3-gene deletion). * **Heinz Bodies:** Denatured hemoglobin precipitates seen in HbH disease (visualized with supravital stains like Brilliant Cresyl Blue). * **Golf Ball Appearance:** Characteristic appearance of RBCs in HbH disease under supravital staining. * **Cis-deletion (--/̱̱):** More common in Asians; carries a higher risk of Hydrops Fetalis in offspring.

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Hematology — MCQs

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