Hematology — MCQs

A 5-year-old male child presents with continuous bleeding from the mouth following a fall. He has no history of bruising or hematoma and is currently taking amoxicillin for a middle ear infection. On examination, he is stable with a small laceration on the lower lip showing blood oozing. Laboratory investigations show Hb 12.8 g/dL, hematocrit 35.4%, WBC count 8400/mm³, platelets 300 x 10⁹/L, Prothrombin time 11.5 seconds, and aPTT 37.2 seconds. What is the most likely diagnosis?

Q38Medium

The parents of an 8-year-old boy complained of frequent severe bleeding on minor trauma. When they consulted a dentist for a decayed tooth, the dentist advised checking of prothrombin time (PT) and activated partial thromboplastin time (aPTT). What would be the expected results for PT and aPTT?

Q39Medium

Which of the following conditions is associated with brown skin pigmentation, hypoplasia of the kidney and spleen, absent or hypoplastic thumb or radius, microcephaly, and mental and sexual retardation?

Q40Medium

In a child with absent thumb, radial deviation of the wrist, and bowing of the forearm, which of the following investigations will not be useful?

Hematology Indian Medical PG Practice Questions and MCQs

Question 31: Where does hematopoiesis occur in the first month of life?

A. Medullary (Correct Answer)
B. Hepatic
C. Lymphatic
D. Mesoblastic

Explanation: **Explanation:** The site of hematopoiesis changes dynamically during fetal development and early infancy. By the **first month of life**, the primary site of hematopoiesis is the **bone marrow (Medullary)**. **1. Why Medullary is correct:** The medullary phase begins around the 4th to 5th month of gestation. By the time a full-term infant is born, the bone marrow has taken over as the predominant site of blood cell production. During the first month of life, hematopoiesis is almost exclusively medullary to meet the infant's physiological demands. **2. Why the other options are incorrect:** * **Hepatic (Option B):** The liver is the chief site of hematopoiesis during the **second trimester** (peaking at 3–6 months gestation). While some residual activity may exist at birth, it ceases shortly thereafter under normal conditions. * **Lymphatic (Option C):** Lymph nodes and the spleen contribute to lymphopoiesis, but they are not the primary sites for general hematopoiesis (RBCs, granulocytes, platelets) in the neonatal period. * **Mesoblastic (Option D):** This is the **earliest stage**, occurring in the yolk sac. It begins around the 3rd week of gestation and ends by the 10th–12th week. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Hematopoiesis:** Yolk Sac (Mesoblastic) → Liver/Spleen (Hepatic) → Bone Marrow (Medullary). * **Extramedullary Hematopoiesis:** If the bone marrow fails or is overwhelmed (e.g., in Thalassemia major or Myelofibrosis), the liver and spleen can resume hematopoiesis, leading to hepatosplenomegaly. * **Infant Bone Marrow:** In infants, almost all bones contain **red marrow** (active). As the child ages, red marrow is replaced by inactive **yellow marrow** (fatty), starting from the distal bones.

Question 32: What is the lifespan of neonatal red blood cells?

A. 120 days
B. 100 days (Correct Answer)
C. 6 months
D. 1 year

Explanation: **Explanation:** The correct answer is **B. 100 days**. In neonates, the red blood cell (RBC) lifespan is significantly shorter than in adults. While adult RBCs circulate for approximately 120 days, full-term neonatal RBCs have a lifespan of **60 to 100 days**. In preterm infants, this duration is even shorter, ranging from **35 to 50 days**. **Why 100 days is correct:** The reduced survival of neonatal RBCs is attributed to several physiological factors: * **Lower enzyme activity:** Reduced levels of enzymes like phosphofructokinase. * **Membrane differences:** Neonatal RBCs have higher membrane fragility and different lipid compositions. * **Metabolic state:** They have lower ATP levels and a decreased ability to withstand oxidative stress. **Analysis of Incorrect Options:** * **A. 120 days:** This is the standard lifespan of **adult** red blood cells. * **C & D (6 months / 1 year):** These durations are physiologically impossible for any human erythrocyte; no RBC survives beyond approximately 4 months under normal conditions. **High-Yield Clinical Pearls for NEET-PG:** 1. **Physiological Jaundice:** The combination of a shorter RBC lifespan and an immature hepatic conjugation system (low UGT enzyme activity) is the primary cause of physiological jaundice in newborns. 2. **Polycythemia:** At birth, neonates have a higher hematocrit (50-60%) and hemoglobin (14-20 g/dL) to compensate for the lower oxygen saturation in utero. 3. **HbF Transition:** At birth, 60-80% of hemoglobin is Fetal Hemoglobin (HbF). It is gradually replaced by Adult Hemoglobin (HbA), usually becoming negligible by 6 months of age.

Question 33: What is the treatment for Kostmann's syndrome?

A. Anti-thymocyte globulin and cyclosporin
B. Anti-thymocyte globulin, cyclosporin, and GM-CSF
C. G-CSF (Correct Answer)
D. GM-CSF

Explanation: **Explanation:** **Kostmann’s Syndrome** (Severe Congenital Neutropenia) is an autosomal recessive disorder characterized by a maturation arrest of neutrophil precursors in the bone marrow at the **promyelocyte/myelocyte stage**. This leads to absolute neutrophil counts (ANC) frequently below 200/µL, predisposing patients to life-threatening pyogenic infections. **Why G-CSF is the Correct Answer:** The primary therapeutic goal in Kostmann’s syndrome is to increase the production and release of functional neutrophils. **Granulocyte Colony-Stimulating Factor (G-CSF)**, specifically Filgrastim, is the treatment of choice. It effectively bypasses the maturation arrest, raises the ANC, and significantly reduces the frequency of infections. While Hematopoietic Stem Cell Transplant (HSCT) is the only definitive cure, G-CSF remains the standard medical management. **Why Other Options are Incorrect:** * **Options A & B:** Anti-thymocyte globulin (ATG) and Cyclosporin are immunosuppressive therapies used for **Aplastic Anemia**, where the pathology is T-cell mediated destruction of stem cells. Kostmann’s is a genetic maturation defect, not an autoimmune process. * **Option D:** While GM-CSF (Granulocyte-Macrophage CSF) can stimulate neutrophil production, it is less effective than G-CSF and is associated with more systemic side effects (fever, bone pain, and rashes). **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Most common mutation is in the **ELANE gene** (though the classic autosomal recessive form involves the **HAX1 gene**). * **Bone Marrow Finding:** Characterized by "maturation arrest" at the promyelocyte stage. * **Risk of Malignancy:** Long-term survivors treated with G-CSF have a significantly increased risk (approx. 10-15%) of developing **Acute Myeloid Leukemia (AML)** or Myelodysplastic Syndrome (MDS). * **Clinical Presentation:** Recurrent omphalitis, skin abscesses, and gingivitis in early infancy.

Question 34: What is the commonest presentation of sickle cell anemia?

A. Priapism
B. Bone pain (Correct Answer)
C. Fever
D. Splenomegaly

Explanation: **Explanation:** Sickle Cell Anemia (SCA) is characterized by the production of abnormal Hemoglobin S (HbS), which polymerizes under low oxygen tension, causing RBCs to become sickle-shaped. These rigid cells obstruct microvasculature, leading to **Vaso-occlusive Crises (VOC)**. **1. Why Bone Pain is Correct:** Bone pain, often referred to as a "painful crisis," is the **most common clinical presentation** and the leading cause of emergency department visits and hospitalizations in patients with SCA. It results from microvascular occlusion in the bone marrow, leading to ischemia and infarction. In infants, this often presents as **Dactylitis** (Hand-Foot Syndrome), while in older children and adults, it involves long bones, ribs, and the spine. **2. Analysis of Incorrect Options:** * **A. Priapism:** While a classic and serious complication due to stasis in the corpora cavernosa, it occurs in only about 30-40% of males and is not the *most common* presentation. * **C. Fever:** Fever is common in SCA due to functional asplenia and increased susceptibility to encapsulated organisms (e.g., *S. pneumoniae*), but it is usually a secondary sign of infection or inflammation rather than the primary presentation of the disease itself. * **D. Splenomegaly:** While seen in early childhood, chronic infarction eventually leads to **autosplenectomy** (shrunken, fibrotic spleen) by adulthood. It is a feature, but not the most frequent presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest manifestation:** Dactylitis (Hand-foot syndrome) usually occurs between 6 months to 2 years of age. * **Most common cause of death:** Acute Chest Syndrome (Adults); Sepsis (Children). * **Osteomyelitis in SCA:** Most common organism is *Salmonella* (though *S. aureus* remains common in the general population). * **Radiology:** "Crew-cut" appearance on skull X-ray and "H-shaped" vertebrae (Codfish vertebrae) due to central endplate infarction.

Question 35: Which of the following statements about Fanconi's anaemia is true except?

A. Progressive pancytopenia
B. Simultanagnosia
C. Visual object agnosia
D. Associated skeletal abnormalities involving thumb and radius (Correct Answer)

Explanation: **Explanation:** Fanconi’s Anaemia (FA) is the most common **inherited bone marrow failure syndrome**, typically inherited in an autosomal recessive pattern. It is characterized by a defect in DNA repair (specifically interstrand cross-link repair), leading to chromosomal instability. **Why Option D is the "True" Statement:** Skeletal abnormalities are a hallmark of FA, occurring in approximately 70% of patients. The most characteristic defects involve the **radial ray**, including a hypoplastic or absent thumb, bifid thumb, or an absent/hypoplastic radius. These physical clues often precede the onset of hematologic symptoms. **Analysis of Other Options:** * **Option A (Progressive Pancytopenia):** This is a **true** statement. FA typically presents with progressive bone marrow failure. Macrocytosis is often the first sign, followed by thrombocytopenia and eventually full pancytopenia (aplastic anemia), usually manifesting between ages 5 and 10. * **Options B & C (Simultanagnosia and Visual Object Agnosia):** These are **false** statements in the context of FA. These are components of **Bálint's syndrome**, typically associated with bilateral parietal-occipital lobe lesions. They have no clinical association with Fanconi’s Anaemia. **NEET-PG High-Yield Pearls:** * **Diagnosis:** The gold standard test is the **Chromosomal Breakage Test** using Diepoxybutane (DEB) or Mitomycin C (MMC). * **Clinical Triad:** Short stature, abnormal skin pigmentation (Café-au-lait spots), and radial ray defects. * **Malignancy Risk:** Patients have a significantly increased risk of **Acute Myeloid Leukemia (AML)** and squamous cell carcinomas (head, neck, and anogenital). * **Treatment:** Hematopoietic Stem Cell Transplant (HSCT) is the only curative treatment for hematologic manifestations.

Question 36: Constitutional pancytopenia can be seen in which of the following conditions?

A. Fanconi's anemia
B. Diamond-Blackfan syndrome (Correct Answer)
C. Dyskeratosis congenita
D. Shwachman-Diamond syndrome

Explanation: **Explanation:** The term **Constitutional Pancytopenia** refers to inherited bone marrow failure syndromes (IBMFS) characterized by a reduction in all three cell lines (anemia, leucopenia, and thrombocytopenia). **Why Diamond-Blackfan Syndrome (DBS) is the correct answer (in the context of this specific question):** While DBS is traditionally classified as a **pure red cell aplasia** (PRCA), it is frequently grouped under the umbrella of "Constitutional Bone Marrow Failure Syndromes." In many standardized examinations, including NEET-PG, the question asks to identify which condition is *not* a typical cause of pancytopenia or which one presents differently. However, if the question asks where constitutional pancytopenia is seen, and DBS is the intended answer, it highlights a common examiner pitfall: **DBS typically presents with isolated macrocytic anemia, not pancytopenia.** *Note: There appears to be a discrepancy in the provided key. Fanconi’s Anemia, Dyskeratosis Congenita, and Shwachman-Diamond Syndrome are classic causes of pancytopenia. DBS is the outlier as it causes selective erythroid failure.* **Analysis of Options:** * **A. Fanconi’s Anemia:** The most common cause of inherited pancytopenia. Characterized by DNA repair defects, short stature, thumb/radial defects, and café-au-lait spots. * **C. Dyskeratosis Congenita:** A telomere biology disorder presenting with the classic triad of abnormal skin pigmentation, nail dystrophy, and oral leukoplakia, leading to progressive pancytopenia. * **D. Shwachman-Diamond Syndrome:** Characterized by exocrine pancreatic insufficiency and skeletal abnormalities, with neutropenia often progressing to pancytopenia. **High-Yield Clinical Pearls for NEET-PG:** * **Fanconi’s Anemia:** Diagnosis is confirmed via the **Chromosomal Breakage Test** (using Mitomycin C or Diepoxybutane). * **Diamond-Blackfan Anemia:** Look for **triphalangeal thumbs**, craniofacial anomalies, and increased **erythrocyte adenosine deaminase (eADA)** levels. * **Pancytopenia + Pancreatic Insufficiency** = Shwachman-Diamond Syndrome. * **Pancytopenia + Mucocutaneous Triad** = Dyskeratosis Congenita.

Question 37: A 5-year-old male child presents with continuous bleeding from the mouth following a fall. He has no history of bruising or hematoma and is currently taking amoxicillin for a middle ear infection. On examination, he is stable with a small laceration on the lower lip showing blood oozing. Laboratory investigations show Hb 12.8 g/dL, hematocrit 35.4%, WBC count 8400/mm³, platelets 300 x 10⁹/L, Prothrombin time 11.5 seconds, and aPTT 37.2 seconds. What is the most likely diagnosis?

A. Hemophilia A
B. Von Willebrand disease (Correct Answer)
C. Glanzmann thrombasthenia
D. Bernard-Soulier syndrome

Explanation: **Explanation:** The clinical presentation of mucosal bleeding (oozing from a lip laceration) in a child with normal platelet counts and normal coagulation profiles (PT and aPTT) strongly points toward **Von Willebrand Disease (vWD)**, the most common inherited bleeding disorder. **1. Why Von Willebrand Disease is correct:** vWD typically presents with **mucocutaneous bleeding** (epistaxis, gingival bleeding, or prolonged oozing from minor cuts). In Type 1 vWD (the most common form), the **PT is normal**, and the **aPTT is often normal or only mildly prolonged** (depending on Factor VIII levels). Since the platelet count is normal but their *function* (adhesion) is impaired due to deficient vWF, it fits the clinical picture of mucosal bleeding despite normal basic labs. **2. Why other options are incorrect:** * **Hemophilia A:** Characterized by deep-seated bleeding (hemarthrosis, muscle hematomas) rather than mucosal oozing. It would typically show a **significantly prolonged aPTT**. * **Glanzmann Thrombasthenia:** A defect in GP IIb/IIIa. While it causes mucosal bleeding, it is a severe platelet aggregation defect often presenting with more dramatic bruising/purpura from infancy. * **Bernard-Soulier Syndrome:** A defect in GP Ib-IX-V. It is characterized by **thrombocytopenia** and **giant platelets** on peripheral smear, which contradicts this patient's normal platelet count (300 x 10⁹/L). **NEET-PG High-Yield Pearls:** * **Screening Test for vWD:** Bleeding Time (BT) is prolonged (though PFA-100 is now preferred); PT/aPTT are often normal. * **Confirmatory Test:** Ristocetin Cofactor Activity (decreased). * **Treatment of Choice:** Desmopressin (DDAVP) for Type 1; Factor VIII concentrates containing vWF for severe cases. * **Inheritance:** Most vWD is Autosomal Dominant (unlike Hemophilia, which is X-linked Recessive).

Question 38: The parents of an 8-year-old boy complained of frequent severe bleeding on minor trauma. When they consulted a dentist for a decayed tooth, the dentist advised checking of prothrombin time (PT) and activated partial thromboplastin time (aPTT). What would be the expected results for PT and aPTT?

A. PT is normal, aPTT is normal
B. PT is prolonged, aPTT is prolonged
C. PT is normal, aPTT is prolonged (Correct Answer)
D. PT is prolonged, aPTT is normal

Explanation: **Explanation:** The clinical presentation of an 8-year-old boy with frequent severe bleeding following minor trauma is highly suggestive of a hereditary coagulation disorder, most commonly **Hemophilia A (Factor VIII deficiency)** or **Hemophilia B (Factor IX deficiency)**. **1. Why Option C is Correct:** Coagulation is divided into the intrinsic, extrinsic, and common pathways. * **aPTT (Activated Partial Thromboplastin Time)** measures the **intrinsic** (Factors XII, XI, IX, VIII) and **common** pathways. Since Hemophilia involves deficiencies in Factor VIII or IX, the aPTT will be **prolonged**. * **PT (Prothrombin Time)** measures the **extrinsic** (Factor VII) and **common** pathways. Because Factor VII levels are normal in Hemophilia, the PT remains **normal**. **2. Why Other Options are Incorrect:** * **Option A:** Normal PT and aPTT are seen in platelet function disorders (like Glanzmann thrombasthenia) or Factor XIII deficiency, but not in classic hemophilia. * **Option B:** Both prolonged indicates a defect in the **common pathway** (Factors X, V, II, or Fibrinogen) or multiple deficiencies (e.g., Vitamin K deficiency, severe liver disease, or DIC). * **Option D:** Prolonged PT with normal aPTT is characteristic of an isolated **Factor VII deficiency**. **3. NEET-PG High-Yield Pearls:** * **Mixing Study:** If aPTT is prolonged, a mixing study is done. If it corrects, it indicates a **factor deficiency**; if it doesn't, it indicates an **inhibitor** (e.g., Lupus anticoagulant). * **Bleeding Time (BT):** Measures platelet function. It is **normal** in Hemophilia but prolonged in von Willebrand Disease (vWD). * **vWD:** This is the most common inherited bleeding disorder. It typically presents with prolonged aPTT (due to low Factor VIII) and prolonged BT. * **Hemophilia Inheritance:** X-linked recessive (mostly affects males).

Question 39: Which of the following conditions is associated with brown skin pigmentation, hypoplasia of the kidney and spleen, absent or hypoplastic thumb or radius, microcephaly, and mental and sexual retardation?

A. Aplastic Anemia (Correct Answer)
B. Pernicious Anemia
C. Sickle Cell Anemia
D. Megaloblastic Anemia

Explanation: The question describes the classic clinical triad of **Fanconi Anemia (FA)**, which is the most common cause of **Inherited Aplastic Anemia**. ### **Why Aplastic Anemia (Fanconi Anemia) is correct:** Fanconi Anemia is an autosomal recessive DNA repair defect (FANC genes) leading to progressive bone marrow failure. It is characterized by: * **Physical Anomalies:** Absent/hypoplastic radii or thumbs (most characteristic), microcephaly, and short stature. * **Skin Changes:** Hyperpigmentation (brown skin) or Café-au-lait spots. * **Organ Hypoplasia:** Renal (horseshoe or ectopic kidney) and splenic hypoplasia. * **Developmental Delay:** Mental and sexual retardation (hypogonadism). The diagnosis is confirmed via a **Chromosomal Breakage Analysis** using Diepoxybutane (DEB) or Mitomycin C. ### **Why other options are incorrect:** * **Pernicious Anemia:** An autoimmune condition causing Vitamin B12 deficiency due to lack of intrinsic factor. It presents with megaloblastic anemia and neurological symptoms (subacute combined degeneration) but not congenital skeletal or renal malformations. * **Sickle Cell Anemia:** A hemoglobinopathy characterized by vaso-occlusive crises and dactylitis. While it can cause functional asplenia later in life, it does not present with radial/thumb hypoplasia or microcephaly. * **Megaloblastic Anemia:** Usually due to B12 or Folate deficiency. It presents with macrocytosis and hypersegmented neutrophils, lacking the structural congenital anomalies described. ### **NEET-PG High-Yield Pearls:** * **Diamond-Blackfan Anemia:** Another inherited anemia with thumb anomalies, but it is a **pure red cell aplasia** (only RBCs are low), whereas FA involves **pancytopenia**. * **TAR Syndrome:** Thrombocytopenia with Absent Radii. Key differentiator: **Thumbs are present** in TAR, but **absent** in Fanconi Anemia. * **Malignancy Risk:** Patients with FA have a significantly increased risk of AML and squamous cell carcinomas.

Question 40: In a child with absent thumb, radial deviation of the wrist, and bowing of the forearm, which of the following investigations will not be useful?

A. Bone marrow examination
B. Karyotyping (Correct Answer)
C. Platelet count
D. 2D Echocardiogram

Explanation: The clinical presentation of an absent thumb, radial deviation of the wrist, and forearm bowing describes **Radial Ray Defects**. In pediatrics, this triad is most commonly associated with **Fanconi Anemia (FA)**, **TAR Syndrome** (Thrombocytopenia Absent Radius), and **VACTERL** association. ### Why Karyotyping is the Correct Answer Standard **Karyotyping** (Option B) is not useful because Fanconi Anemia is not a numerical or structural chromosomal anomaly detectable by routine staining. Instead, the gold standard diagnostic test is the **Chromosomal Breakage Analysis** using clastogenic agents like Diepoxybutane (DEB) or Mitomycin C. While both involve chromosomes, "Karyotyping" refers to a different laboratory process that would appear normal in these patients. ### Why the Other Options are Useful * **Bone Marrow Examination (Option A):** Essential for Fanconi Anemia to evaluate for progressive pancytopenia, macrocytic anemia, or progression to MDS/AML. * **Platelet Count (Option B):** Crucial to differentiate between FA (pancytopenia) and TAR syndrome (isolated thrombocytopenia). Note: In TAR, the thumb is usually *present*, whereas in FA, it is *absent*. * **2D Echocardiogram (Option D):** Necessary to screen for congenital heart defects associated with VACTERL association or Holt-Oram syndrome (Heart-Hand syndrome). ### High-Yield Clinical Pearls * **Fanconi Anemia:** Most common inherited bone marrow failure; features include café-au-lait spots, short stature, and radial defects. * **TAR Syndrome:** Thrombocytopenia + Absent Radius + **Preserved Thumbs** (Key differentiator). * **Holt-Oram Syndrome:** ASD/VSD + Radial ray defects. * **VACTERL:** Vertebral, Anal atresia, Cardiac, TE fistula, Renal, and Limb defects.

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Hematology — MCQs

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