Hematology Practice Questions

Q: Iron overload occurs in all of the following conditions except?

Polycythemia vera. **Explanation:** The core concept behind iron overload in hematological disorders is **ineffective erythropoiesis** and **chronic transfusion requirements**. **Why Polycythemia Vera (PV) is the correct answer:** Polycythemia Vera is a myeloproliferative neoplasm characterized by the autonomous overproduction of red blood cells. Unlike the other conditions listed, PV is actually associated with **iron deficiency**, not overload [1]. This occurs because the massive expansion of the red cell mass consumes the body's iron stores. In fact, therapeutic phlebotomy (the mainstay of treatment for PV) further depletes iron to help control the hematocrit levels. **Analysis of Incorrect Options:** * **Thalassemia:** Iron overload occurs due to two mechanisms: chronic blood transfusions and increased intestinal iron absorption triggered by suppressed hepcidin (due to ineffective erythropoiesis) [1]. * **Myelodysplastic Syndrome (MDS):** Patients often become transfusion-dependent. Additionally, ineffective erythropoiesis leads to the suppression of hepcidin, increasing dietary iron absorption [1]. * **Sideroblastic Anemia:** This is a classic cause of iron overload. It involves a defect in heme synthesis, leading to iron accumulation in the mitochondria of erythroblasts (forming "ringed sideroblasts"). **Clinical Pearls for NEET-PG:** * **Hepcidin Connection:** Ineffective erythropoiesis releases "Erythroferrone," which inhibits Hepcidin. Low Hepcidin levels lead to increased ferroportin activity, causing excessive iron absorption even without transfusions [1]. * **Hereditary Hemochromatosis:** The most common genetic cause of primary iron overload (HFE gene mutation). * **Diagnostic Gold Standard:** While serum ferritin is a screening tool, **MRI T2*** is the non-invasive gold standard for quantifying cardiac and hepatic iron overload.

Q: Polycythemia is not caused by which of the following?

Lung carcinoma. **Explanation:** The question tests the concept of **Secondary Polycythemia** caused by inappropriate **Erythropoietin (EPO)** production. **Why Lung Carcinoma is the correct answer:** While lung carcinoma (specifically Small Cell Lung Cancer) is notorious for paraneoplastic syndromes like SIADH or ectopic ACTH production [1], [3], it is **not** typically associated with ectopic EPO production. Therefore, it does not cause polycythemia. In fact, chronic malignancy often leads to the "anemia of chronic disease." **Analysis of Incorrect Options (Causes of Polycythemia):** Certain tumors are classic "EPO-producers," leading to an absolute increase in red cell mass: * **Renal Cell Carcinoma (RCC):** The most common tumor associated with ectopic EPO production [1]. * **Hepatocellular Carcinoma (Liver):** A well-recognized cause of paraneoplastic polycythemia [1]. * **Cerebellar Hemangioblastoma:** A classic association, often seen in Von Hippel-Ludlau (VHL) syndrome [1]. **Clinical Pearls for NEET-PG:** To remember the common tumors causing ectopic EPO production, use the mnemonic **"Potentially Really High Hematocrit"** [1]: 1. **P**heochromocytoma 2. **R**enal Cell Carcinoma 3. **H**epatocellular Carcinoma 4. **H**emangioblastoma (Cerebellar) 5. **U**terine Fibroids (Leiomyoma) **Distinction:** * **Primary Polycythemia (Polycythemia Vera):** Low EPO levels due to JAK2 mutation [2]. * **Secondary Polycythemia:** High EPO levels due to hypoxia or ectopic tumor production [2].

Q: A 23-year-old asymptomatic female pilot presents with MCV of 70 fL, ferritin of 100 g/L, and Hb of 10 g/dL. What is the most likely cause?

Thalassemia trait. **Explanation:** The clinical presentation describes a patient with **microcytic anemia** (MCV 70 fL, Hb 10 g/dL) but with **normal iron stores** (Ferritin 100 g/L) [2]. This dissociation is the hallmark of Thalassemia trait. **1. Why Thalassemia Trait is correct:** In Thalassemia trait (minor), there is a genetic defect in globin chain synthesis [1]. This leads to a high number of small (microcytic), pale (hypochromic) red blood cells. Crucially, because the pathology is globin-related and not iron-related, the **Serum Ferritin remains normal or slightly elevated**. Additionally, patients are often asymptomatic and the anemia is typically mild [1][2]. **2. Why the other options are incorrect:** * **Iron Deficiency Anemia (IDA):** While IDA also presents with low MCV, it is characterized by **low Ferritin** (usually 100 fL; macrocytosis), not a low MCV. **3. NEET-PG High-Yield Pearls:** * **Mentzer Index:** Calculated as **MCV / RBC count**. A value ** 13** suggests Iron Deficiency Anemia. * **RBC Count:** In Thalassemia trait, the RBC count is often paradoxically high (polycythemia) despite low Hb, whereas in IDA, the RBC count is low. * **Confirmatory Test:** Hb Electrophoresis (showing increased HbA2 >3.5% in Beta-Thalassemia trait) is the gold standard for diagnosis.

Q: Hemophilia manifests clinically as a rise in which of the following parameters?

APTT. Hemophilia (A and B) is a X-linked recessive bleeding disorder caused by a deficiency in **Factor VIII** (Hemophilia A) or **Factor IX** (Hemophilia B). Both of these factors are integral components of the **Intrinsic Pathway** of the coagulation cascade. **1. Why APTT is the correct answer:** The **Activated Partial Thromboplastin Time (APTT)** is the screening test used to evaluate the integrity of the intrinsic and common pathways [1]. Since Hemophilia involves a deficiency in intrinsic pathway factors (VIII or IX), the APTT will be characteristically **prolonged (increased)**. **2. Why the other options are incorrect:** * **PT (Prothrombin Time):** This tests the **Extrinsic Pathway** (Factor VII) and the common pathway [1]. Since Factor VII levels are normal in Hemophilia, the PT remains normal. * **CT (Clotting Time):** While CT can be prolonged in severe hemophilia, it is a non-specific, insensitive, and outdated bedside test. APTT is the definitive laboratory parameter for diagnosis. * **FDP (Fibrin Degradation Products):** These are elevated in conditions involving excessive fibrinolysis or clot breakdown, such as **DIC (Disseminated Intravascular Coagulation)**, not in primary factor deficiencies like Hemophilia [1]. **Clinical Pearls for NEET-PG:** * **Mixing Study:** If APTT is prolonged, a mixing study is performed [1]. If the APTT **corrects** after adding normal plasma, it indicates a factor deficiency (Hemophilia). If it does **not correct**, it indicates the presence of an inhibitor (e.g., Lupus anticoagulant). * **Bleeding Profile in Hemophilia:** Prolonged APTT; Normal PT, Normal Bleeding Time (BT), and Normal Platelet Count. * **Clinical Presentation:** Characterized by deep tissue bleeding, **hemarthrosis** (bleeding into joints), and delayed surgical bleeding.

Q: A patient presented with painless proptosis. What is the next investigation to diagnose it as chloroma?

Peripheral smear. **Explanation:** **Chloroma**, also known as **Myeloid Sarcoma** or Granulocytic Sarcoma, is an extramedullary collection of immature myeloid cells. In the pediatric population, it classically presents as **painless proptosis** due to orbital involvement. **Why Peripheral Smear is the Correct Next Step:** Chloroma is most commonly associated with **Acute Myeloid Leukemia (AML)**, particularly the **M2 (AML with maturation)** and **M4/M5** subtypes [1]. When a patient presents with a clinical suspicion of chloroma, the immediate priority is to look for systemic involvement of leukemia. A **Peripheral Smear** is the most rapid, cost-effective, and non-invasive "next step" to identify circulating myeloblasts, Auer rods, or abnormal cell counts that point toward a primary hematologic malignancy [1]. **Analysis of Incorrect Options:** * **A & C (Hemoglobin/Platelets):** While these may show cytopenias (anemia or thrombocytopenia) in leukemia, they are non-specific and do not provide a definitive morphological diagnosis of the underlying disease. * **D (Bone Marrow Biopsy):** While this is the *gold standard* for confirming and subtyping leukemia, it is a more invasive procedure [1]. In the diagnostic algorithm, a peripheral smear always precedes a bone marrow biopsy. **High-Yield Clinical Pearls for NEET-PG:** * **Color:** The name "Chloroma" comes from the Greek *chloros* (green), due to the presence of the enzyme **Myeloperoxidase (MPO)**, which gives the tumor a greenish hue upon exposure to light. * **Common Site:** The orbit is a classic site in children; other sites include the skin (leukemia cutis), lymph nodes, and gingiva [2]. * **Cytogenetics:** Frequently associated with **t(8;21)** [1]. * **Management:** Treatment involves systemic chemotherapy (as for AML), even if the bone marrow appears uninvolved at presentation.

Q: A 20-year-old patient presents with a year of fatigue and tiredness. Investigations show Hb 9g/dL, MCV 10%, and peripheral smear reveals macrocytic red blood cells with hypersegmented neutrophils. What is the most likely diagnosis?

Alcoholism. The clinical presentation of **macrocytic anemia** (high MCV) and **hypersegmented neutrophils** is a classic hallmark of **Megaloblastic Anemia**, typically caused by Vitamin B12 or Folate deficiency [1]. **Why Alcoholism is the correct answer:** Chronic alcoholism is a frequent cause of macrocytosis. It leads to anemia through multiple mechanisms: 1. **Nutritional Deficiency:** Alcoholics often have poor dietary intake, leading to **Folate deficiency** [1]. 2. **Direct Toxicity:** Alcohol has a direct toxic effect on the bone marrow, interfering with erythrocyte maturation. 3. **Malabsorption:** Chronic alcohol use impairs the intestinal absorption of folate. Hypersegmented neutrophils (defined as >5% of neutrophils having 5 lobes or any having ≥6 lobes) are the earliest pathognomonic sign of megaloblastic changes in the marrow [1]. **Why other options are incorrect:** * **Iron Deficiency Anemia:** Characterized by **microcytic hypochromic** anemia (Low MCV) and pencil cells, not macrocytosis. * **Lead Poisoning:** Typically presents with microcytic anemia and characteristic **basophilic stippling** on the peripheral smear. * **Anemia of Chronic Disease:** Usually presents as **normocytic normochromic** anemia, though it can become microcytic in long-standing cases. **NEET-PG High-Yield Pearls:** * **Earliest sign of Megaloblastic Anemia:** Hypersegmented neutrophils on peripheral smear [1]. * **MCV in Megaloblastic Anemia:** Usually >100 fL. * **Alcohol vs. B12/Folate:** While B12/Folate deficiency causes *megaloblastic* macrocytosis, alcoholism and liver disease can also cause *non-megaloblastic* macrocytosis (where neutrophils are normal). However, in the context of this question, the presence of hypersegmented neutrophils confirms the megaloblastic process triggered by alcohol-induced folate deficiency.

Q: Peripheral smear showing the arrows is diagnostic of which of the following conditions?

Megaloblastic anemia. ***Megaloblastic anemia*** - The peripheral smear shows **hypersegmented neutrophils** with ≥5 nuclear lobes and **macro-ovalocytes**, which are pathognomonic for megaloblastic anemia. - These morphological findings result from **impaired DNA synthesis** due to **vitamin B12** or **folate deficiency**, creating the characteristic cellular abnormalities. *Hemolytic anemia* - Would show evidence of **red cell destruction** like **schistocytes**, **spherocytes**, or **bite cells** on peripheral smear. - Typically presents with **elevated LDH**, **decreased haptoglobin**, and **increased reticulocyte count**, not hypersegmented neutrophils. *Macrothrombocytopenia with large platelets* - This condition would show **abnormally large platelets** and **decreased platelet count** on the smear. - The arrows in the question point to **neutrophils** and **red blood cells**, not platelet abnormalities. *Pernicious anemia* - While pernicious anemia can cause megaloblastic changes, it represents a **specific etiology** (intrinsic factor deficiency) that cannot be diagnosed by smear alone. - The peripheral smear findings are consistent with **megaloblastic anemia as a morphological entity**, requiring additional tests like **intrinsic factor antibodies** to diagnose pernicious anemia specifically.

Q: What is the most appropriate investigation for a 40-year-old female presenting with anemia, jaundice, and spherocytosis?

Coomb's test. ### Explanation The clinical triad of **anemia, jaundice, and spherocytosis** in a 40-year-old female strongly suggests a diagnosis of **Autoimmune Hemolytic Anemia (AIHA)**. **1. Why Coomb's Test is the Correct Answer:** In clinical practice, the most common cause of acquired spherocytosis is AIHA. The **Direct Antiglobulin Test (Coomb’s test)** is the gold standard investigation to confirm this [1]. It detects antibodies (IgG) or complement (C3) bound to the surface of red blood cells. In AIHA, splenic macrophages partially "nibble" the antibody-coated RBC membrane, reducing the surface-area-to-volume ratio and transforming the cells into **spherocytes** [1]. **2. Why Other Options are Incorrect:** * **Osmotic Fragility (A):** While increased in both Hereditary Spherocytosis (HS) and AIHA, it is a non-specific test. In a 40-year-old presenting acutely, AIHA must be ruled out first before considering a congenital condition like HS [1]. * **Electrophoresis (C):** This is used to diagnose hemoglobinopathies (e.g., Thalassemia, Sickle Cell Anemia), which typically present with microcytic or sickle cells, not primary spherocytosis. * **RBC Enzyme Analysis (D):** Used for G6PD deficiency or Pyruvate Kinase deficiency. These conditions present with bite cells or echinocytes, respectively, rather than predominant spherocytosis [2]. **Clinical Pearls for NEET-PG:** * **Hereditary Spherocytosis (HS) vs. AIHA:** Both show spherocytes. However, HS usually presents in childhood with a positive family history and a **negative** Coomb’s test. AIHA is usually acquired in adulthood and is **Coomb’s positive** [1]. * **MCHC:** Spherocytosis is the only condition where the Mean Corpuscular Hemoglobin Concentration (MCHC) is typically **increased** (>36 g/dL). * **Confirmatory Test for HS:** The Eosin-5-maleimide (EMA) binding test via flow cytometry is now preferred over osmotic fragility.

Q: What is the most common inherited bleeding disorder?

Von Willebrand disease. **Explanation:** **Von Willebrand Disease (vWD)** is the most common inherited bleeding disorder worldwide, affecting approximately 1% of the general population. It is caused by a quantitative or qualitative deficiency of **Von Willebrand Factor (vWF)**, a large multimeric glycoprotein essential for platelet adhesion to the subendothelium (via GpIb receptors) and for stabilizing Factor VIII in the circulation. It is typically inherited in an **Autosomal Dominant** pattern (Types 1 and 2). **Analysis of Options:** * **Bernard-Soulier Syndrome:** A rare autosomal recessive disorder caused by a deficiency of the **GpIb-IX-V receptor**. It is characterized by giant platelets and thrombocytopenia. * **Glanzmann Thrombasthenia:** A rare autosomal recessive disorder caused by a deficiency of the **GpIIb/IIIa receptor**, leading to defective platelet aggregation. * **Idiopathic Thrombocytopenic Purpura (ITP):** While common, this is an **acquired** autoimmune condition, not an inherited one. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Mucocutaneous bleeding (epistaxis, menorrhagia, gingival bleeding). * **Screening Tests:** Bleeding Time (BT) is prolonged; Platelet count is usually normal (except in Type 2B). * **Confirmatory Tests:** Ristocetin Cofactor Activity (decreased) and vWF Antigen levels. * **APTT:** May be prolonged because vWF stabilizes Factor VIII. * **Treatment of Choice:** **Desmopressin (DDAVP)** for Type 1 (releases stored vWF from Weibel-Palade bodies); Cryoprecipitate or vWF-containing concentrates for severe cases.

Q: Which one of the following findings is NOT consistent with the diagnosis of aplastic anemia?

Splenomegaly. **Explanation:** Aplastic anemia is a bone marrow failure syndrome characterized by **pancytopenia** and a **hypocellular bone marrow**. **Why Splenomegaly is the Correct Answer:** The hallmark of aplastic anemia is the replacement of hematopoietic tissue with fat. Because the primary pathology is a failure of production (stem cell depletion) rather than peripheral destruction or infiltration, **splenomegaly is characteristically absent**. If a patient presents with pancytopenia and an enlarged spleen, clinicians should instead suspect conditions like portal hypertension (cirrhosis), hypersplenism, hairy cell leukemia, or myelofibrosis [1]. **Analysis of Other Options:** * **Option A:** According to the **Camitta Criteria** for severe aplastic anemia, the bone marrow must show cellularity <25% (or <50% if less than 30% of remaining cells are hematopoietic). * **Option B:** In true aplastic anemia, the few remaining hematopoietic cells should appear **morphologically normal**. The presence of significant dysplasia (abnormal morphology) would point toward Myelodysplastic Syndrome (MDS) rather than aplastic anemia. * **Option C:** The anemia is typically **normocytic normochromic**, though a mild macrocytosis (increased MCV) is sometimes seen due to stressed erythropoiesis. **NEET-PG High-Yield Pearls:** * **Most common cause:** Idiopathic (Autoimmune T-cell mediated destruction of stem cells). * **Drug triggers:** Chloramphenicol (most famous), Carbamazepine, Sulfonamides, and Gold salts. * **Viral triggers:** Hepatitis (Non-A, Non-B, Non-C, Non-G), Parvovirus B19 (usually causes pure red cell aplasia or aplastic crisis in hemolytic states). * **Treatment of choice:** Allogeneic Bone Marrow Transplant (for young patients) or Immunosuppressive Therapy (Antithymocyte globulin + Cyclosporine).

Question 1

Iron overload occurs in all of the following conditions except?

Accepted Answer

Polycythemia vera

Answer

Thalassemia

Answer

Myelodysplastic syndrome

Answer

Sideroblastic anemia

Question 2

Polycythemia is not caused by which of the following?

Accepted Answer

Lung carcinoma

Answer

Renal carcinoma

Answer

Liver carcinoma

Answer

Cerebellar hemangioma

Question 3

A 23-year-old asymptomatic female pilot presents with MCV of 70 fL, ferritin of 100 g/L, and Hb of 10 g/dL. What is the most likely cause?

Accepted Answer

Thalassemia trait

Answer

Vitamin B12 deficiency

Answer

Folate deficiency

Answer

Iron deficiency

Question 4

Hemophilia manifests clinically as a rise in which of the following parameters?

Accepted Answer

APTT

Answer

PT

Answer

CT

Answer

FDP

Question 5

A patient presented with painless proptosis. What is the next investigation to diagnose it as chloroma?

Accepted Answer

Peripheral smear

Answer

Blood haemoglobin

Answer

Platelets

Answer

Bone marrow biopsy

Question 6

A 20-year-old patient presents with a year of fatigue and tiredness. Investigations show Hb 9g/dL, MCV 10%, and peripheral smear reveals macrocytic red blood cells with hypersegmented neutrophils. What is the most likely diagnosis?

Accepted Answer

Alcoholism

Answer

Iron deficiency anemia

Answer

Lead poisoning

Answer

Anemia of chronic disease

Question 7

Peripheral smear showing the arrows is diagnostic of which of the following conditions?

Accepted Answer

Megaloblastic anemia

Answer

Hemolytic anemia

Answer

Macrothrombocytopenia with large platelets

Answer

Pernicious anemia

Question 8

What is the most appropriate investigation for a 40-year-old female presenting with anemia, jaundice, and spherocytosis?

Accepted Answer

Coomb's test

Answer

Osmotic fragility

Answer

Electrophoresis

Answer

RBC Enzyme analysis

Question 9

What is the most common inherited bleeding disorder?

Accepted Answer

Von Willebrand disease

Answer

Bernard-Soulier syndrome

Answer

Glanzmann thrombasthenia

Answer

Idiopathic thrombocytopenic purpura (acute)

Question 10

Which one of the following findings is NOT consistent with the diagnosis of aplastic anemia?

Accepted Answer

Splenomegaly

Answer

Hematopoietic cells occupying less than 25% of marrow space

Answer

Hematopoietic cells morphology should be normal

Answer

Normocytic normochromic anemia

Hematology — MCQs

Hematology — MCQs

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