Hematology Practice Questions

Q: 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?

Hemoglobin (Hb) electrophoresis. **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 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.

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

>50 years. 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%).

Q: What does the acronym 'POEMS' stand for?

Polyneuropathy. 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.

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

Above 5%. 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:** 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].

Q: 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?

Macroangiopathic hemolytic anemia. ### 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).

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

Hepatitis. **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").

Q: 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?

Iron deficiency anemia. 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.

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

Hb Bart's. 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.

Question 1

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?

Accepted Answer

Hemoglobin (Hb) electrophoresis

Answer

Erythrocyte Sedimentation Rate (ESR) estimation

Answer

Blood spherocyte estimation

Answer

Bone marrow aspiration

Question 2

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

Accepted Answer

>50 years

Answer

10-20 years

Answer

20-30 years

Answer

30-50 years

Question 3

Which of the following is not a feature of megaloblastic anemia?

Accepted Answer

Reticulocytosis

Answer

Thrombocytopenia

Answer

Megakaryocytes

Answer

Howell-Jolly bodies

Question 4

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?

Accepted Answer

Total iron-binding capacity

Answer

Low serum transferrin

Answer

Total serum copper

Answer

Serum ferritin

Question 5

What does the acronym 'POEMS' stand for?

Accepted Answer

Polyneuropathy

Answer

Oesophageal dysmotility

Answer

Endocrinopathy

Answer

M-protein

Question 6

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

Accepted Answer

Above 5%

Answer

Above 10%

Answer

Above 30%

Answer

Any of the above

Question 7

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?

Accepted Answer

Macroangiopathic hemolytic anemia

Answer

Acanthocytosis

Answer

Henoch-Schönlein purpura

Answer

Idiopathic thrombocytopenic purpura

Question 8

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

Accepted Answer

Hepatitis

Answer

H. pylori infection

Answer

Tetanus

Answer

Bacteremia

Question 9

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?

Accepted Answer

Iron deficiency anemia

Answer

Acute lymphoblastic leukemia

Answer

Hemoglobin D disease

Answer

Hereditary spherocytosis

Question 10

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

Accepted Answer

Hb Bart's

Answer

Beta thalassemia major

Answer

HbH disease

Answer

Alpha thalassemia trait

Hematology — MCQs

Hematology — MCQs

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