Hematology Practice Questions

Q: A 10-year-old boy presents with mucosal bleeding of 1 week's duration. Which investigation is most useful in this patient?

Platelet count. **Explanation:** The clinical presentation of **mucosal bleeding** (such as epistaxis, gum bleeding, or petechiae) is a hallmark of **primary hemostasis** defects. Primary hemostasis involves the formation of a platelet plug and is dependent on adequate platelet numbers and function. Therefore, a **Platelet count** is the most useful initial investigation to rule out thrombocytopenia (e.g., ITP, which is common in children). **Why the other options are incorrect:** * **Prothrombin Time (PT):** Measures the extrinsic and common pathways of the coagulation cascade. Deficiencies here typically present with deep-seated bleeds (hematomas or hemarthrosis), not superficial mucosal bleeding. * **Partial Thromboplastin Time (PTT):** Measures the intrinsic and common pathways. Like PT, it assesses secondary hemostasis. Prolonged PTT is seen in conditions like Hemophilia, which rarely presents with isolated mucosal bleeding. * **Clotting Time (CT):** This is an obsolete, insensitive test with poor reproducibility. It only becomes prolonged in severe coagulation factor deficiencies and is not used in modern clinical practice. **NEET-PG Clinical Pearls:** * **Primary Hemostasis Defect:** Characterized by mucosal bleeding, petechiae, purpura, and immediate bleeding after injury. (Tests: Platelet count, Bleeding Time/PFA-100). * **Secondary Hemostasis Defect:** Characterized by deep muscle hematomas, hemarthrosis (joint bleeds), and delayed bleeding. (Tests: PT, aPTT). * **Von Willebrand Disease (vWD):** The most common inherited bleeding disorder; it is a unique "hybrid" that often presents with mucosal bleeding because vWF is required for platelet adhesion.

Q: A one-year-old baby, exclusively breastfed, presents with 1 cm hepatomegaly, severe pallor, and no splenomegaly. What is the most important investigation?

Serum iron estimation. **Explanation:** The clinical presentation of severe pallor, hepatomegaly (without splenomegaly), and a history of **exclusive breastfeeding** beyond six months in a one-year-old is classic for **Iron Deficiency Anemia (IDA)**. **1. Why Serum Iron Estimation is correct:** Breast milk is a poor source of iron. While the bioavailability of iron in breast milk is high, the absolute quantity is insufficient to meet the demands of a growing infant after 4–6 months of age. If complementary feeding (weaning) with iron-rich foods is not started, the infant exhausts their fetal iron stores, leading to IDA. In IDA, the liver may be slightly enlarged due to fatty changes associated with chronic hypoxia, but significant splenomegaly is typically absent (unlike in hemolytic anemias). Therefore, assessing iron status is the priority. **2. Why other options are incorrect:** * **Vitamin B12/Folic Acid:** While megaloblastic anemia causes pallor, it is less common in exclusively breastfed infants unless the mother is a strict vegan. Furthermore, megaloblastic anemia often presents with hypersegmented neutrophils and significant irritability/developmental regression. * **Fetal Hemoglobin (HbF):** This is used to diagnose Thalassemia. However, Thalassemia major typically presents with **significant splenomegaly** (due to extramedullary hematopoiesis) and frontal bossing, which are absent here. **Clinical Pearls for NEET-PG:** * **Most common cause of anemia** in toddlers worldwide: Iron Deficiency. * **Milk Anemia:** Excessive intake of cow’s milk (>600ml/day) is a major risk factor for IDA in older infants. * **Mentzer Index (MCV/RBC count):** 13 suggests Iron Deficiency Anemia. * **First laboratory sign of recovery** after iron supplementation: Increase in Reticulocyte count (usually within 3–7 days).

Q: In iron deficiency anemia, after hemoglobin levels have returned to normal and iron stores are replenished, for how long should iron tablets be recommended?

0-3 months. **Explanation:** The management of Iron Deficiency Anemia (IDA) involves not only normalizing hemoglobin (Hb) levels but also replenishing the body's iron stores (ferritin). **Why Option A is Correct:** According to standard pediatric guidelines (including Nelson and IAP), oral iron therapy should be continued for **2 to 3 months after the hemoglobin level has returned to normal**. This duration is sufficient to saturate the iron stores (measured by serum ferritin). Continuing therapy for 0-3 months post-normalization ensures that the child does not relapse into anemia once the immediate demand for erythropoiesis is met. **Why Other Options are Incorrect:** * **Options B, C, and D:** Extending treatment for 6 to 24 months is unnecessary for uncomplicated IDA. Prolonged iron supplementation beyond the replenishment of stores increases the risk of gastrointestinal side effects (constipation, abdominal pain), poor compliance, and potential iron overload. These durations are typically reserved for chronic malabsorptive states or ongoing blood loss, which are not the standard scenarios for this question. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest response to Iron:** Subjective improvement (increased appetite/alertness) occurs within **12–24 hours**. * **Earliest Hematological response:** Reticulocytosis, which peaks at **5–7 days**. * **Hemoglobin rise:** Usually increases by **0.7–1 g/dL per week**. * **Dose:** The therapeutic dose of elemental iron in children is **3–6 mg/kg/day**. * **Best Absorption:** Iron is best absorbed on an empty stomach or with Vitamin C (citrus juices); absorption is inhibited by milk, tea, and phytates.

Q: A child presents with bleeding from the gums and a swollen knee. What is the most likely diagnosis?

Hemophilia. **Explanation:** The clinical presentation of a **swollen knee** (suggestive of hemarthrosis) combined with mucosal bleeding (gum bleeding) in a child is a classic indicator of a coagulation factor deficiency, most commonly **Hemophilia A (Factor VIII)** or **B (Factor IX)**. 1. **Why Hemophilia is correct:** Hemophilia is characterized by deep tissue bleeding, such as **hemarthrosis** (bleeding into joints) and muscle hematomas. While gum bleeding is often associated with platelet disorders, it can also occur in severe hemophilia following minor trauma or poor dental hygiene. The presence of a swollen joint (hemarthrosis) is the "hallmark" sign that points specifically to a clotting factor deficiency rather than a primary hemostatic defect. 2. **Why other options are incorrect:** * **ITP:** Typically presents with superficial "platelet-type" bleeding, such as petechiae, purpura, and ecchymosis. Hemarthrosis is extremely rare in ITP. * **Scurvy:** Vitamin C deficiency causes gum bleeding (swollen, spongy gums) and subperiosteal hemorrhages, which can cause limb pain (pseudoparalysis), but it does not typically cause true intra-articular joint swelling (hemarthrosis). * **Trauma:** While trauma can cause a swollen knee, it would not explain spontaneous or recurrent gum bleeding unless there was a systemic underlying pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Hemophilia A and B are **X-linked recessive** (mostly affects males). * **Lab Findings:** Isolated **prolonged aPTT** with a normal PT and normal bleeding time. * **Most common joint involved:** The **knee** is the most common site of hemarthrosis in children. * **Treatment:** Replacement of the specific deficient factor. For Hemophilia A, Emicizumab (a bispecific antibody) is a newer non-factor therapy.

Q: The mother of a child with idiopathic thrombocytopenic purpura is worried about serious bleeding. When reassuring this mother, what is the approximate platelet count threshold for generalized bleeding?

20,000/mm 3. **Explanation:** In pediatric Idiopathic Thrombocytopenic Purpura (ITP), the risk of spontaneous, generalized bleeding (such as epistaxis, hematuria, or gastrointestinal hemorrhage) is closely correlated with the absolute platelet count. 1. **Why 20,000/mm³ is correct:** While the normal platelet range is 1.5–4.5 lakh/mm³, the body maintains primary hemostasis effectively even with reduced numbers. The threshold of **20,000/mm³** is clinically significant because spontaneous, life-threatening bleeding is rare above this level. Most children with counts >20,000/mm³ only exhibit cutaneous symptoms (petechiae/bruising) and can often be managed with observation ("watch and wait") rather than aggressive medical intervention. 2. **Analysis of Incorrect Options:** * **5,000/mm³:** This is the critical threshold for **Intracranial Hemorrhage (ICH)**. While generalized bleeding occurs here, it is an extreme danger zone rather than the standard threshold for general systemic bleeding. * **50,000/mm³:** At this level, patients are generally asymptomatic. Bleeding usually only occurs following significant trauma or major surgery. * **100,000/mm³:** This is considered mild thrombocytopenia. Hemostasis is clinically normal, and no spontaneous bleeding occurs. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of isolated thrombocytopenia in an otherwise healthy child is ITP. * **Management:** If platelets are >20,000/mm³ and the child is asymptomatic, observation is preferred. If <20,000/mm³ with mucosal bleeding, first-line treatments include **IVIG** or **Corticosteroids**. * **Bone Marrow Aspiration:** Not mandatory unless atypical features (fever, bone pain, lymphadenopathy) are present to rule out Leukemia. If done, it shows **increased megakaryocytes**.

Q: A child presents with seborrheic dermatitis, sinusitis, and chronically draining ears. On examination, the child has failure to thrive with hepatosplenomegaly and exophthalmos. What is the probable diagnosis?

Histiocytosis-X. **Explanation:** The clinical presentation described is a classic triad of **Langerhans Cell Histiocytosis (LCH)**, formerly known as **Histiocytosis-X**. **Why Histiocytosis-X is correct:** LCH is characterized by the abnormal proliferation of Langerhans cells. The case describes the **Hand-Schüller-Christian disease** variant, which typically presents with a triad of **exophthalmos, diabetes insipidus (due to pituitary involvement), and lytic bone lesions**. * **Skin:** Seborrheic dermatitis-like rash (often involving the scalp and diaper area) is a hallmark. * **Ears:** Chronic ear discharge (otitis media/externa) unresponsive to antibiotics is a high-yield sign. * **Systemic:** Hepatomegaly and failure to thrive indicate multisystem involvement (Letterer-Siwe disease spectrum). **Why other options are incorrect:** * **Wegener’s Granulomatosis:** While it causes sinusitis and ear issues, it typically presents with pulmonary nodules and glomerulonephritis (hematuria) in older patients, not seborrheic dermatitis or exophthalmos in children. * **Chronic Granulomatous Disease (CGD):** A defect in phagocytic NADPH oxidase leading to recurrent catalase-positive infections (abscesses, osteomyelitis). It does not cause exophthalmos or lytic bone lesions. * **Chediak-Higashi Syndrome:** Characterized by partial oculocutaneous albinism, giant granules in neutrophils, and recurrent pyogenic infections, not the specific triad seen here. **NEET-PG High-Yield Pearls:** 1. **Pathognomonic finding:** **Birbeck granules** (tennis-racket shaped) on electron microscopy. 2. **Immunohistochemistry:** Positive for **CD1a, S-100, and CD207 (Langerin)**. 3. **Bone Lesions:** "Punched-out" lytic lesions, especially in the skull. 4. **Ear Involvement:** Chronic draining ears in a child with a scalp rash should always trigger suspicion of LCH.

Q: A serious coagulopathy characterized by severe thrombocytopenia and hemorrhage due to platelet trapping within the tumor is called?

Kasabach-Merrit Phenomenon. ### Explanation **Kasabach-Merritt Phenomenon (KMP)** is the correct answer. It is a life-threatening hematologic condition characterized by the combination of a rapidly enlarging vascular tumor, **profound thrombocytopenia**, and consumptive coagulopathy. **1. Why it is correct:** The underlying mechanism involves **platelet trapping** and activation within the abnormal architecture of specific vascular tumors. This leads to the consumption of platelets and clotting factors (DIC-like picture), resulting in severe hemorrhage. It is most commonly associated with **Tufted Angioma** or **Kaposiform Hemangioendothelioma**, rather than common infantile hemangiomas. **2. Why other options are incorrect:** * **PHACE(S) Syndrome:** This is a neurocutaneous syndrome involving **P**osterior fossa malformations, **H**emangiomas (large, segmental), **A**rterial anomalies, **C**ardiac defects, and **E**ye anomalies. It does not inherently involve platelet sequestration. * **Kaposi’s Sarcoma:** A spindle-cell tumor caused by HHV-8, typically seen in immunocompromised patients (AIDS). While it is a vascular tumor, it does not cause the systemic consumptive coagulopathy seen in KMP. * **Hemangioma:** While common infantile hemangiomas are benign vascular tumors, they **do not** cause Kasabach-Merritt Phenomenon. KMP is specific to more aggressive vascular neoplasms like Kaposiform Hemangioendothelioma. **3. NEET-PG High-Yield Pearls:** * **Classic Triad:** Large vascular tumor + Thrombocytopenia + Microangiopathic hemolytic anemia. * **First-line Treatment:** Systemic corticosteroids and **Sirolimus** (mTOR inhibitor) are currently preferred. * **Lab Findings:** Low platelets, low fibrinogen, and elevated D-dimer (consumptive coagulopathy). * **Avoid:** Platelet transfusions should be avoided unless there is active bleeding, as they may "fuel the fire" by being trapped in the tumor.

Q: Fanconi's anemia is a type of:

Constitutional anemia. **Explanation:** **Fanconi’s Anemia (FA)** is the most common cause of **inherited (constitutional) aplastic anemia**. It is an autosomal recessive (rarely X-linked) DNA repair disorder characterized by hypersensitivity to DNA cross-linking agents. The term "constitutional" refers to the fact that the condition is congenital and arises from an underlying genetic defect present from birth, leading to progressive bone marrow failure. **Analysis of Options:** * **Option A (Correct):** It is a constitutional anemia because it is a hereditary syndrome involving pancytopenia. It typically presents between 5–10 years of age with macrocytic anemia progressing to aplastic anemia. * **Option B (Incorrect):** Hemolytic anemias involve the premature destruction of RBCs (e.g., Spherocytosis, G6PD deficiency). FA is a failure of production (hypoplasia), not destruction. * **Option C (Incorrect):** Iron deficiency is a nutritional microcytic anemia. FA is a normocytic to macrocytic anemia caused by stem cell depletion. * **Option D (Incorrect):** Autoimmune anemias (like AIHA) involve antibody-mediated destruction. While some aplastic anemias are T-cell mediated (acquired), FA is strictly genetic. **High-Yield Clinical Pearls for NEET-PG:** * **Physical Findings:** Short stature, **absent/hypoplastic thumbs**, radius abnormalities, microcephaly, and **Café-au-lait spots**. * **Gold Standard Diagnosis:** **Chromosomal Breakage Analysis** (using Mitomycin C or Diepoxybutane). * **Malignancy Risk:** High predisposition to **AML** and squamous cell carcinomas (head and neck). * **Treatment:** Hematopoietic stem cell transplant (HSCT) is the definitive cure for hematologic manifestations.

Question 1

A 10-year-old boy presents with mucosal bleeding of 1 week's duration. Which investigation is most useful in this patient?

Accepted Answer

Platelet count

Answer

Prothrombin time

Answer

Clotting time

Answer

Partial thromboplastin time

Question 2

A one-year-old baby, exclusively breastfed, presents with 1 cm hepatomegaly, severe pallor, and no splenomegaly. What is the most important investigation?

Accepted Answer

Serum iron estimation

Answer

Vitamin B12 estimation

Answer

Folic acid estimation

Answer

Fetal hemoglobin estimation

Question 3

What is the primary treatment for Kostmann's syndrome?

Accepted Answer

G-CSF

Answer

Anti-thymocyte globulin and cyclosporin

Answer

Anti-thymocyte globulin, cyclosporin, and GM-CSF

Answer

GM-CSF

Question 4

In iron deficiency anemia, after hemoglobin levels have returned to normal and iron stores are replenished, for how long should iron tablets be recommended?

Accepted Answer

0-3 months

Answer

3-6 months

Answer

6-12 months

Answer

12-24 months

Question 5

A child presents with bleeding from the gums and a swollen knee. What is the most likely diagnosis?

Accepted Answer

Hemophilia

Answer

Idiopathic Thrombocytopenic Purpura (ITP)

Answer

Scurvy

Answer

Trauma

Question 6

The mother of a child with idiopathic thrombocytopenic purpura is worried about serious bleeding. When reassuring this mother, what is the approximate platelet count threshold for generalized bleeding?

Accepted Answer

20,000/mm
3

Answer

5,000/mm
3

Answer

50,000/mm
3

Answer

100,000/mm
3

Question 7

A child presents with seborrheic dermatitis, sinusitis, and chronically draining ears. On examination, the child has failure to thrive with hepatosplenomegaly and exophthalmos. What is the probable diagnosis?

Accepted Answer

Histiocytosis-X

Answer

Wegener's granulomatosis

Answer

Chronic granulomatous disease

Answer

Chediak-Higashi syndrome

Question 8

A five-year-old child presents with chronic bed wetting and bilateral loose deciduous first molars. His mother reports that he drinks water several times during each night. Which of the following is the most likely diagnosis?

Accepted Answer

Hand-Schüller-Christian disease

Answer

Marble bone disease

Answer

Niemann-Pick disease

Answer

Polyostotic fibrous dysplasia

Question 9

A serious coagulopathy characterized by severe thrombocytopenia and hemorrhage due to platelet trapping within the tumor is called?

Accepted Answer

Kasabach-Merrit Phenomenon

Answer

Phace (S) Syndrome

Answer

Kaposi's sarcoma

Answer

Hemangioma

Question 10

Fanconi's anemia is a type of:

Accepted Answer

Constitutional anemia

Answer

Hemolytic anemia

Answer

Iron deficiency anemia

Answer

Autoimmune anemia

Hematology — MCQs

Hematology — MCQs

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