Hematology Practice Questions

Q: What is the approximate percentage of Hemoglobin F (HbF) at birth?

70%. **Explanation:** **Understanding the Concept:** Hemoglobin F (HbF, $\alpha_2\gamma_2$) is the predominant hemoglobin during fetal life due to its high affinity for oxygen, which facilitates oxygen transfer from maternal blood across the placenta. The switch from fetal ($\gamma$-globin) to adult ($\beta$-globin) synthesis begins around 30 weeks of gestation. At the time of birth, a full-term neonate typically has **70% to 80% HbF**, with the remaining 20–30% being adult hemoglobin (HbA). **Analysis of Options:** * **Option C (70%) is Correct:** This represents the standard physiological level of HbF in a term neonate. * **Option A (20%) & B (50%):** These levels are too low for a newborn. HbF levels drop to approximately 50% by 1 month of age and reach adult levels (<1%) by 6–12 months. * **Option D (90%):** While HbF is nearly 90–95% at 30 weeks gestation, the progressive switch to HbA reduces this to ~70% by the time the baby is born at term. **NEET-PG High-Yield Pearls:** 1. **The "Switch":** HbF levels decline rapidly after birth. By **6 months of age**, HbF usually drops to **<5%**. 2. **Clinical Significance:** Beta-hemoglobinopathies (like **Beta-Thalassemia Major** and **Sickle Cell Anemia**) do not manifest clinically until 6 months of age, as the protective effect of HbF wanes and the defective HbA production becomes dominant. 3. **Structure:** HbF consists of two alpha ($\alpha$) and two gamma ($\gamma$) chains. 4. **P50 Value:** HbF has a lower P50 (approx. 19 mmHg) compared to HbA (approx. 27 mmHg), reflecting its higher oxygen affinity.

Q: "Chipmunk face" is characteristically seen in?

Beta thalassemia major. **Explanation:** **Beta Thalassemia Major (Correct Answer):** The "Chipmunk face" (or Thalassemic facies) is a classic manifestation of **ineffective erythropoiesis** and chronic hemolytic anemia. In Beta Thalassemia Major, the body attempts to compensate for severe anemia by expanding the bone marrow (erythroid hyperplasia). This **extramedullary hematopoiesis** causes the marrow cavities of the facial and cranial bones to expand, leading to: * Prominent cheekbones (malar prominence). * Frontal bossing. * Depressed nasal bridge. * Protrusion of the upper jaw (maxillary hypertrophy) with malocclusion of teeth. On X-ray, this marrow expansion in the skull gives the characteristic **"Hair-on-end" appearance**. **Why other options are incorrect:** * **Fetal Alcohol Syndrome:** Characterized by a smooth philtrum, thin upper lip, and short palpebral fissures, but not bony overgrowth. * **Cushing’s Syndrome:** Presents with a **"Moon face"** due to redistribution of adipose tissue (fat), not bony changes. * **Acromegaly:** Features frontal bossing and a prominent jaw (**prognathism**) due to excess Growth Hormone in adults, but it is not described as "chipmunk-like." **High-Yield Clinical Pearls for NEET-PG:** * **Management:** Regular blood transfusions are required, which can lead to **secondary hemosiderosis** (iron overload). * **Iron Chelation:** Usually started when ferritin levels exceed 1000 ng/ml or after 10–20 transfusions. * **Hb Electrophoresis:** Shows absence or marked reduction of HbA, with significantly elevated **HbF**.

Q: Increased fetal hemoglobin is seen in which of the following conditions?

Juvenile chronic myeloid leukemia (CML). **Explanation:** The correct answer is **Juvenile Chronic Myeloid Leukemia (JCML)**, now more commonly classified under Juvenile Myelomonocytic Leukemia (JMML). **1. Why JCML is correct:** JCML is a unique pediatric clonal myeloproliferative disorder. A hallmark feature of this condition is **"fetal-like erythropoiesis."** In JCML, the red blood cell precursors revert to a fetal phenotype, leading to a significant elevation of **Fetal Hemoglobin (HbF)**, often reaching 15–50% of total hemoglobin. This is a crucial diagnostic marker that helps differentiate JCML from adult-type CML occurring in children. **2. Why other options are incorrect:** * **Congenital red cell aplasia (Diamond-Blackfan Anemia):** While HbF can be elevated in this condition due to stress erythropoiesis, it is not the classic diagnostic association compared to the dramatic rise seen in JCML. * **Hereditary spherocytosis:** This is a red cell membrane defect. Hemoglobin electrophoresis is typically normal; there is no inherent mechanism for increased HbF production. * **Acute myeloid leukemia (AML):** While some cases of erythroleukemia (M6) might show minor elevations, increased HbF is not a characteristic or diagnostic feature of AML. **Clinical Pearls for NEET-PG:** * **JCML Triad:** Hepatosplenomegaly, lymphadenopathy, and skin rash (often xanthomas or café-au-lait spots). * **Diagnostic Clue:** Absence of the Philadelphia chromosome ($t[9;22]$) distinguishes JCML from adult CML. * **Other conditions with high HbF:** Beta-thalassemia major, Sickle cell anemia, and Hereditary Persistence of Fetal Hemoglobin (HPFH). * **JMML Association:** Strongly associated with **Neurofibromatosis type 1 (NF1)** and Noonan syndrome.

Q: A 5-year-old girl presents with a history of progressively increasing pallor for the past year and hepatosplenomegaly. Which of the following is the most relevant test for achieving a diagnosis?

Hb electrophoresis. **Explanation:** The clinical presentation of a 5-year-old child with **progressive pallor** (chronic anemia) and **hepatosplenomegaly** is a classic triad for **Thalassemia Major**. In the Indian context, this is the most common cause of transfusion-dependent hereditary anemia presenting in early childhood. **1. Why Hb Electrophoresis is the Correct Answer:** Hb electrophoresis (or HPLC) is the **gold standard** for diagnosing hemoglobinopathies. In Thalassemia Major, it reveals a characteristic pattern: a significant increase in **HbF (>90%)**, variable HbA2, and a near-total absence of HbA. This confirms the defect in globin chain synthesis, which is the underlying pathology. **2. Why Other Options are Incorrect:** * **Peripheral Smear:** While it shows microcytic hypochromic anemia with target cells and nucleated RBCs, these findings are non-specific and can overlap with Iron Deficiency Anemia (IDA). It suggests the diagnosis but does not confirm it. * **Osmotic Fragility Test:** This is the screening test for **Hereditary Spherocytosis**. In Thalassemia, osmotic fragility is actually *decreased* (cells are more resistant to lysis), making it an inappropriate diagnostic tool here. * **Bone Marrow Examination:** While it would show erythroid hyperplasia, it is an invasive procedure and is **not required** for the diagnosis of Thalassemia. **Clinical Pearls for NEET-PG:** * **HPLC (High-Performance Liquid Chromatography)** is now preferred over electrophoresis in modern practice for its precision. * **X-ray finding:** Look for "Hair-on-end" appearance (due to extramedullary hematopoiesis) and "Chipmunk facies." * **Mentzer Index:** (MCV/RBC count) 13 suggests Iron Deficiency Anemia.

Q: All are seen in Thalassemia major EXCEPT:

Macrocytic anemia. **Explanation:** **Why Macrocytic Anemia is the Correct Answer:** Thalassemia major is characterized by **microcytic hypochromic anemia**, not macrocytic anemia. The underlying pathology involves a genetic defect in the synthesis of globin chains (specifically $\beta$-chains in $\beta$-Thalassemia). This leads to a decrease in hemoglobin production within the red blood cells, resulting in smaller (microcytic) and paler (hypochromic) cells. Macrocytic anemia (MCV >100 fL) is typically seen in Vitamin B12 or Folate deficiency. **Analysis of Incorrect Options:** * **Transfusion dependency:** In Thalassemia major, the severe imbalance of globin chains leads to profound anemia. Patients typically present in the first year of life and require lifelong regular blood transfusions to maintain hemoglobin levels and suppress ineffective erythropoiesis. * **Splenohepatomegaly:** This occurs due to two mechanisms: **extramedullary hematopoiesis** (the body attempting to produce RBCs outside the bone marrow) and **hemosiderosis** (iron overload from chronic transfusions). * **Ineffective erythropoiesis:** The precipitation of unpaired $\alpha$-globin chains causes oxidative damage to the RBC precursors in the bone marrow, leading to their premature destruction before they reach circulation. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral Smear:** Look for target cells, nucleated RBCs, and Howell-Jolly bodies. * **Skeletal Changes:** "Chipmunk facies" and "Hair-on-end" appearance on X-ray due to compensatory bone marrow expansion. * **Diagnosis:** **Hb Electrophoresis** or HPLC is the gold standard (shows increased HbF and absent/low HbA). * **Mentzer Index:** (MCV/RBC count) 13 suggests Iron Deficiency Anemia.

Q: What is true about iron deficiency anemia in children?

Serum ferritin depletes first.. In Iron Deficiency Anemia (IDA), the depletion of iron occurs in a predictable, sequential manner. Understanding these stages is high-yield for NEET-PG. ### **Why Option C is Correct** The progression of iron deficiency follows three distinct stages: 1. **Iron Depletion (Stage 1):** The body’s storage iron is exhausted first to maintain serum levels. **Serum ferritin** is the most sensitive marker for this stage and is the **earliest laboratory index to decline.** 2. **Iron Deficient Erythropoiesis (Stage 2):** Serum iron decreases, and Total Iron Binding Capacity (TIBC) increases. 3. **Iron Deficiency Anemia (Stage 3):** Hemoglobin falls, and microcytic hypochromic changes appear on the peripheral smear. ### **Why Other Options are Incorrect** * **Option A:** Iron is primarily absorbed in the **duodenum** and upper jejunum, not the terminal ileum (which is the site for Vitamin B12 absorption). * **Option B:** Both cow’s milk and breast milk have low iron content (approx. 0.5–1 mg/L). However, the **bioavailability** of iron in breast milk is much higher (50%) compared to cow’s milk (10%). Cow's milk is a major risk factor for IDA due to its low bioavailability and potential for microscopic intestinal blood loss. * **Option D:** RDW (Red Cell Distribution Width) is **increased** in IDA. It is one of the earliest signs of IDA and helps differentiate it from Thalassemia trait (where RDW is typically normal). ### **High-Yield Clinical Pearls for NEET-PG** * **Mentzer Index:** (MCV/RBC count) >13 suggests IDA; <13 suggests Thalassemia. * **Best screening test:** Hemoglobin. * **Most sensitive/earliest indicator:** Serum Ferritin. * **Gold Standard investigation:** Bone marrow iron stores (Prussian blue staining), though rarely done clinically. * **First response to oral iron:** Reticulocytosis (peaks at 7–10 days).

Q: Hereditary spherocytosis is best treated with?

Splenectomy. **Explanation:** **Hereditary Spherocytosis (HS)** is an autosomal dominant disorder caused by defects in red blood cell (RBC) membrane proteins (most commonly **Ankyrin**, followed by Spectrin). These defects lead to a loss of membrane surface area, forcing RBCs to become spherical. These rigid spherocytes are trapped and destroyed by splenic macrophages, leading to extravascular hemolysis. **Why Splenectomy is the Correct Answer:** Splenectomy is the **definitive treatment** for moderate to severe HS. While it does not fix the underlying genetic membrane defect (spherocytes will still be present on a peripheral smear), it removes the primary site of RBC destruction. This significantly increases RBC lifespan, resolves anemia, and prevents the formation of pigment gallstones. **Why Other Options are Incorrect:** * **B & C (Immunoglobulins & Steroids):** These are used for **Autoimmune Hemolytic Anemia (AIHA)**, where hemolysis is mediated by antibodies. HS is a structural/genetic defect, not an immunological one; therefore, immunosuppression is ineffective. * **D (Blood Transfusion):** This is a supportive measure used only during acute hemolytic or aplastic crises. It is not a long-term treatment or cure. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Increased **MCHC** (>36 g/dL) is a classic finding. The **Osmotic Fragility Test** is the traditional screening test, but the **EMA Binding Test** (Flow cytometry) is now the gold standard. * **Complications:** Patients are prone to **Pigment (Calcium Bilirubinate) Gallstones** and aplastic crises (triggered by **Parvovirus B19**). * **Surgical Timing:** Splenectomy is usually delayed until **after age 5–6** to reduce the risk of Overwhelming Post-Splenectomy Infection (OPSI). * **Pre-op Requirement:** Immunization against encapsulated organisms (*S. pneumoniae, H. influenzae, N. meningitidis*) is mandatory 2 weeks prior to surgery.

Question 1

A 21-year-old male presents with anemia and mild hepatosplenomegaly. His hemoglobin is 5 g/dL and he has a history of a single blood transfusion. What is the most probable diagnosis?

Accepted Answer

Autoimmune hemolytic anemia

Answer

Thalassemia major

Answer

Thalassemia minor

Answer

Thalassemia intermedia

Question 2

What type of transfusion is ideally recommended for children with thalassemia?

Accepted Answer

Saline washed packed RBC

Answer

Packed RBC

Answer

Platelet rich plasma

Answer

Whole blood

Question 3

What is the approximate percentage of Hemoglobin F (HbF) at birth?

Accepted Answer

70%

Answer

20%

Answer

50%

Answer

90%

Question 4

"Chipmunk face" is characteristically seen in?

Accepted Answer

Beta thalassemia major

Answer

Fetal alcohol syndrome

Answer

Cushing's syndrome

Answer

Acromegaly

Question 5

Increased fetal hemoglobin is seen in which of the following conditions?

Accepted Answer

Juvenile chronic myeloid leukemia (CML)

Answer

Congenital red cell aplasia

Answer

Hereditary spherocytosis

Answer

Acute myeloid leukemia (AML)

Question 6

Which of the following is true about acute idiopathic thrombocytopenic purpura (ITP)?

Accepted Answer

Viral infections predispose to ITP.

Answer

It is more common in adults.

Answer

Detection of specific anti-platelet antibodies is mandatory for diagnosis.

Answer

Approximately 80% of cases transform into chronic ITP.

Question 7

A 5-year-old girl presents with a history of progressively increasing pallor for the past year and hepatosplenomegaly. Which of the following is the most relevant test for achieving a diagnosis?

Accepted Answer

Hb electrophoresis

Answer

Peripheral smear examination

Answer

Osmotic fragility test

Answer

Bone marrow examination

Question 8

All are seen in Thalassemia major EXCEPT:

Accepted Answer

Macrocytic anemia

Answer

Transfusion dependency

Answer

Splenoheptatomegaly

Answer

Ineffective erythropoiesis

Question 9

What is true about iron deficiency anemia in children?

Accepted Answer

Serum ferritin depletes first.

Answer

Iron absorption occurs from the terminal ileum.

Answer

Cow milk contains less iron than breast milk.

Answer

Red cell distribution width (RDW) is decreased.

Question 10

Hereditary spherocytosis is best treated with?

Accepted Answer

Splenectomy

Answer

Immunoglobulins

Answer

Steroids

Answer

Blood transfusion

Hematology — MCQs

Hematology — MCQs

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