Hematology Practice Questions

Q: A 5-year-old male child presents with severe transfusion-requiring anemia and jaundice. On examination, the liver and spleen are palpable 5 cm below the costal margin. Peripheral smear analysis shows findings consistent with a specific diagnosis. What is your diagnosis?

Thalassemia. ***Thalassemia*** • **Microcytic hypochromic RBCs**, **target cells**, **nucleated RBCs**, and **poikilocytosis** on peripheral smear are pathognomonic for thalassemia major in a young child with severe anemia. • **Massive hepatosplenomegaly** (5 cm below costal margin) occurs due to **extramedullary hematopoiesis** and **iron overload**, characteristic of thalassemia major requiring regular transfusions. *Nutritional anemia* • Would typically present as **iron deficiency** with **microcytic hypochromic** RBCs but without **target cells** or **nucleated RBCs** on peripheral smear. • Does not cause **massive hepatosplenomegaly** or require **frequent transfusions** in early childhood. *Aplastic anemia* • Characterized by **pancytopenia** with **hypocellular bone marrow**, not isolated severe anemia with abnormal RBC morphology. • Peripheral smear shows **normocytic normochromic** RBCs without the characteristic findings of **target cells** or **nucleated RBCs**. *Autoimmune hemolytic anemia* • Would show **spherocytes** and **polychromasia** on peripheral smear, not the **microcytic hypochromic** pattern with **target cells**. • Typically responds to **immunosuppressive therapy** rather than requiring chronic transfusions from early childhood.

Q: What is the first change of improvement noted after iron therapy is initiated?

Decreased irritability. **Explanation:** The clinical response to iron therapy in Iron Deficiency Anemia (IDA) follows a highly predictable chronological sequence. **1. Why "Decreased Irritability" is correct:** The earliest response to iron therapy is **subjective clinical improvement**, specifically a decrease in irritability and an increase in appetite. This occurs within **12 to 24 hours** of initiating therapy. This rapid change happens because iron is a crucial cofactor for several enzymes in the central nervous system (such as monoamine oxidase) and cellular metabolism (cytochromes). These enzymes are replenished long before new red blood cells are produced. **2. Analysis of Incorrect Options:** * **B. Reticulocytosis:** This is the first **objective hematological** sign of improvement. It typically begins within 48–72 hours and peaks between 5 to 10 days after starting therapy. * **C. Increase in serum iron levels:** While serum iron may fluctuate after a dose, it is not used as a reliable marker of early therapeutic response compared to clinical or reticulocyte changes. * **D. Replenishment of iron stores:** This is the **final** stage of therapy. Hemoglobin levels usually normalize within 1–2 months, but therapy must be continued for an additional 3–4 months to replenish ferritin (iron stores). **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Improvement:** Subjective/Enzymatic (12-24h) → Reticulocytosis (3-7 days) → Increase in Hemoglobin (begins in 1 week, normalizes by 2 months) → Storage/Ferritin (3-6 months). * **Oral Dose (Pediatrics):** 3–6 mg/kg/day of elemental iron. * **Best Absorption:** Iron is best absorbed on an empty stomach with Vitamin C (ascorbic acid), which maintains iron in the ferrous ($Fe^{2+}$) state.

Q: A 7-year-old boy presented with sudden onset petechiae and purpura. There was a history of upper respiratory tract infection 2 weeks prior. On examination, there was no hepatosplenomegaly. What is the most probable diagnosis?

Idiopathic Thrombocytopenic Purpura. ### Explanation The clinical presentation is classic for **Immune Thrombocytopenic Purpura (ITP)**, formerly known as Idiopathic Thrombocytopenic Purpura. **Why Option C is Correct:** ITP in children typically presents in the **2–8 year age group** with a sudden onset of isolated thrombocytopenia (petechiae, purpura, and bruising). A key diagnostic feature is a **preceding viral illness** (URTI or exanthem) occurring 1–3 weeks prior. Crucially, the absence of hepatosplenomegaly and lymphadenopathy points toward a diagnosis where only the platelet lineage is affected, rather than a systemic or bone marrow process. **Why Other Options are Incorrect:** * **A. Acute Lymphoblastic Leukemia (ALL):** While ALL presents with petechiae, it is usually accompanied by systemic signs like fever, bone pain, and physical findings like **hepatosplenomegaly** or lymphadenopathy. * **B. Acute Viral Infection:** While some viruses (like Dengue) cause thrombocytopenia, the 2-week lag period and the "sudden onset" of skin bleeds in an otherwise well-appearing child specifically favor the post-viral immune-mediated destruction seen in ITP. * **D. Aplastic Anemia:** This involves pancytopenia. Patients would typically present with symptoms of anemia (pallor, fatigue) and increased susceptibility to infections (neutropenia), which are absent here. **Clinical Pearls for NEET-PG:** * **Pathogenesis:** Type II hypersensitivity reaction where IgG autoantibodies are directed against platelet surface glycoproteins (**GpIIb/IIIa**). * **Bone Marrow:** If performed (to rule out leukemia), it shows **increased megakaryocytes**. * **Management:** Most childhood cases are self-limiting. If treatment is required (platelets <20,000/mm³ or significant bleeding), **IVIG** or **Corticosteroids** are first-line. * **Rule of Thumb:** Isolated thrombocytopenia + No Splenomegaly + Preceding URTI = ITP.

Q: Macrocytic anemia in children is produced by all of the following except?

Copper deficiency. **Explanation:** The correct answer is **Copper deficiency** because it typically presents as a **microcytic, hypochromic anemia** (mimicking iron deficiency) or a normocytic anemia, often accompanied by neutropenia. Copper is a vital cofactor for *hephaestin* and *ceruloplasmin*, enzymes required for iron transport and utilization. Its deficiency leads to impaired iron incorporation into hemoglobin, resulting in small red blood cells rather than large ones. **Analysis of other options:** * **Thiamine deficiency (Option A):** Specifically, **Thiamine-Responsive Megaloblastic Anemia (TRMA)** or Rogers Syndrome is a rare genetic disorder characterized by megaloblastic (macrocytic) anemia, non-type 1 diabetes, and sensorineural deafness. * **Orotic aciduria (Option B):** This is an autosomal recessive disorder of pyrimidine synthesis. The deficiency of UMP synthase leads to a failure in DNA synthesis, resulting in a **megaloblastic (macrocytic) anemia** that does not respond to Vitamin B12 or Folic acid. * **Liver disease (Option C):** Chronic liver disease causes macrocytosis through several mechanisms, including increased lipid deposition on the RBC membrane (target cells) and altered cholesterol metabolism, leading to an increased Mean Corpuscular Volume (MCV). **High-Yield Clinical Pearls for NEET-PG:** 1. **Copper Deficiency Hallmark:** Look for the combination of **anemia + neutropenia** in a patient on long-term TPN or following gastric bypass surgery. 2. **Bone Marrow Finding:** Copper deficiency often shows **ringed sideroblasts** and cytoplasmic vacuolization in myeloid precursors, which can be mistaken for Myelodysplastic Syndrome (MDS). 3. **Macrocytic Anemia Classification:** Always differentiate between **Megaloblastic** (DNA synthesis defect: B12/Folate deficiency, Orotic aciduria) and **Non-megaloblastic** (Liver disease, Hypothyroidism, Diamond-Blackfan anemia).

Q: A 6-week-old child presents with a hemoglobin of 10 gm% and appears pale on examination. What is the most likely diagnosis?

Physiological anemia. ### Explanation **1. Why Physiological Anemia is the Correct Answer:** Physiological anemia of infancy is a normal, non-pathological drop in hemoglobin (Hb) levels that occurs in healthy, term infants. After birth, the transition from a low-oxygen intrauterine environment to a high-oxygen extrauterine environment leads to a surge in tissue oxygenation. This causes a **downregulation of Erythropoietin (EPO)** production by the kidneys, leading to a temporary suspension of erythropoiesis. Additionally, the shortened lifespan of neonatal red blood cells (60–90 days) and rapid expansion of blood volume contribute to this decline. In term infants, the Hb nadir typically reaches **9–11 gm% at 6–9 weeks of age**, which matches this clinical presentation. **2. Why Other Options are Incorrect:** * **Pathological Anemia:** This is suggested if the Hb drop occurs earlier (first 4 weeks), is more severe (<9 gm%), or is accompanied by jaundice, hepatosplenomegaly, or reticulocytosis. * **Thalassemia:** While a common cause of microcytic anemia, β-thalassemia major usually presents later (after 6 months) as fetal hemoglobin (HbF) transitions to adult hemoglobin (HbA). * **Iron Deficiency Anemia (IDA):** Term infants have sufficient iron stores for the first 4–6 months of life. IDA is rare at 6 weeks unless there was significant perinatal blood loss or extreme prematurity. **3. NEET-PG High-Yield Pearls:** * **Nadir Timing:** Term infants reach nadir at **6–9 weeks** (Hb ~9–11 gm%); Preterm infants reach nadir earlier at **4–8 weeks** (Hb ~7–9 gm%). * **Management:** No treatment is required for physiological anemia; it resolves spontaneously as EPO levels rise in response to the lower Hb. * **Iron Stores:** Iron supplementation in term infants is generally started at **4 months** of age to prevent late-onset IDA.

Q: Frameshift mutation occurs due to:

Insertion. ### Explanation **Correct Answer: C. Insertion** **The Concept:** The genetic code is read in sets of three nucleotides called **codons**. A **frameshift mutation** occurs when the number of nucleotides added (insertion) or removed (deletion) is not a multiple of three. This shifts the "reading frame" of the mRNA during translation. Consequently, every single amino acid downstream of the mutation is altered, often leading to a premature stop codon and a non-functional, truncated protein. **Analysis of Options:** * **Insertion (Correct):** Adding one or two nucleotides disrupts the triplet reading frame, causing a frameshift. (Note: Deletion also causes this). * **Transition (Incorrect):** This is a type of point mutation where a purine is replaced by a purine (A↔G) or a pyrimidine by a pyrimidine (C↔T). It changes only one codon. * **Transversion (Incorrect):** A point mutation where a purine is replaced by a pyrimidine or vice versa (e.g., A↔C). Like transitions, these are "substitutions" and do not shift the reading frame. * **Point Mutation (Incorrect):** This is a broad term for a change in a single nucleotide base pair. While it includes insertions, it most commonly refers to substitutions (silent, missense, or nonsense mutations) which do not necessarily cause a frameshift. **High-Yield Clinical Pearls for NEET-PG:** * **Duchenne Muscular Dystrophy (DMD):** Classically caused by **frameshift mutations** (deletions), leading to a complete absence of functional dystrophin. * **Becker Muscular Dystrophy (BMD):** Caused by **non-frameshift mutations** (in-frame deletions); the protein is shorter but partially functional, resulting in a milder phenotype. * **Tay-Sachs Disease:** Often results from a 4-base pair insertion in the HEXA gene, causing a frameshift. * **Beta-Thalassemia:** Can be caused by various mutations, including frameshifts that result in "null" ($\beta^0$) production of globin chains.

Q: A 2-year-old child presents with short stature and cafe-au-lait spots. Bone marrow aspiration yields a little material and mostly containing fat. What is your diagnosis?

Fanconi anemia. ### Explanation **Correct Answer: A. Fanconi Anemia** **Reasoning:** The clinical triad of **short stature**, **café-au-lait spots**, and **aplastic anemia** (suggested by the "dry tap" or fat-rich bone marrow) is classic for **Fanconi Anemia (FA)**. FA is the most common cause of inherited bone marrow failure. It is an autosomal recessive (mostly) DNA repair defect. * **Physical Findings:** Short stature, skin hyperpigmentation (café-au-lait spots), and skeletal anomalies (especially **absent/hypoplastic thumb** or radius). * **Hematology:** Progressive pancytopenia usually manifests between ages 2 and 10. The bone marrow biopsy typically shows **hypocellularity with fatty replacement**, as described in the question. **Why other options are incorrect:** * **B. Dyskeratosis Congenita:** While it also causes inherited bone marrow failure, it is characterized by a specific clinical triad: **abnormal skin pigmentation (reticular), nail dystrophy, and oral leukoplakia**. * **C. Tuberous Sclerosis:** Presents with café-au-lait spots and skin lesions (ash-leaf spots, adenoma sebaceum), but it is a neurocutaneous syndrome associated with seizures and tumors (hamartomas), not bone marrow failure. * **D. Osteogenesis Imperfecta:** Characterized by bone fragility, blue sclera, and hearing loss; it does not present with aplastic anemia or café-au-lait spots. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Test:** Chromosomal breakage analysis using **Diepoxybutane (DEB)** or Mitomycin C. * **Malignancy Risk:** Patients have a significantly increased risk of **AML** and squamous cell carcinomas (head, neck, and anogenital). * **Most common skeletal deformity:** Thumb and radial ray defects. * **Treatment of choice:** Hematopoietic stem cell transplant (HSCT).

Question 1

Which of the following is NOT related to fetal erythropoiesis?

Accepted Answer

In the embryonic phase, erythropoiesis is first demonstrated in the yolk sac.

Answer

By the 20th week of gestation, the liver becomes the major site of erythropoiesis.

Answer

Near term, the bone marrow becomes the major site of erythropoiesis.

Answer

At term, 75-80% of hemoglobin is the fetal type (HbF).

Question 2

A 5-year-old male child presents with severe transfusion-requiring anemia and jaundice. On examination, the liver and spleen are palpable 5 cm below the costal margin. Peripheral smear analysis shows findings consistent with a specific diagnosis. What is your diagnosis?

Accepted Answer

Thalassemia

Answer

Nutritional anemia

Answer

Aplastic anemia

Answer

Autoimmune hemolytic anemia

Question 3

What is the first change of improvement noted after iron therapy is initiated?

Accepted Answer

Decreased irritability

Answer

Reticulocytosis

Answer

Increase in serum iron levels

Answer

Replenishment of iron stores

Question 4

A 7-year-old boy presented with sudden onset petechiae and purpura. There was a history of upper respiratory tract infection 2 weeks prior. On examination, there was no hepatosplenomegaly. What is the most probable diagnosis?

Accepted Answer

Idiopathic Thrombocytopenic Purpura

Answer

Acute Lymphoblastic Leukemia

Answer

Acute viral infection

Answer

Aplastic Anemia

Question 5

A 20-month-old female child presents for a routine check-up. A complete blood count (CBC) reveals moderate neutropenia, but the child appears healthy, eats well, and is within expected developmental parameters for her age and sex. Other blood count parameters are within the normal range for her age. The family history is unremarkable. Repeat CBCs after one and two weeks show persistent neutropenia. Bone marrow examination is normal. What is the next best step in management?

Accepted Answer

Adopt a 'watch and wait' strategy

Answer

Administer corticosteroids

Answer

Administer multivitamins

Answer

Start antibiotics to prevent infection

Question 6

Macrocytic anemia in children is produced by all of the following except?

Accepted Answer

Copper deficiency

Answer

Thiamine deficiency

Answer

Orotic aciduria

Answer

Liver disease

Question 7

A 5-year-old boy presents with petechial spots that appeared overnight. Two weeks prior, he experienced abdominal pain. There is no hepatosplenomegaly. What is the most likely diagnosis?

Accepted Answer

Idiopathic thrombocytopenic purpura

Answer

Acute lymphoblastic leukemia

Answer

Aplastic anemia

Answer

Acute viral infection

Question 8

A 6-week-old child presents with a hemoglobin of 10 gm% and appears pale on examination. What is the most likely diagnosis?

Accepted Answer

Physiological anemia

Answer

Pathological anemia

Answer

Thalassemia

Answer

Iron deficiency anemia

Question 9

Frameshift mutation occurs due to:

Accepted Answer

Insertion

Answer

Transition

Answer

Transversion

Answer

Point mutation

Question 10

A 2-year-old child presents with short stature and cafe-au-lait spots. Bone marrow aspiration yields a little material and mostly containing fat. What is your diagnosis?

Accepted Answer

Fanconi anemia

Answer

Dyskeratosis congenita

Answer

Tuberous sclerosis

Answer

Osteogenesis imperfecta

Hematology — MCQs

Hematology — MCQs

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