Hematopathology Practice Questions

Q: What is the typical Vitamin B level in chronic myeloid leukemia?

Elevated. **Explanation:** In Chronic Myeloid Leukemia (CML), serum Vitamin B12 levels are characteristically **elevated**, often reaching several times the normal limit. This occurs due to the massive expansion of the granulocytic series (neutrophils and their precursors). These cells synthesize and secrete **Transcobalamin I (TCI)**, an R-binder protein responsible for transporting Vitamin B12 in the plasma. As the total white blood cell count rises, the concentration of TCI increases proportionally, leading to an increased total B12 binding capacity and elevated serum B12 levels. **Analysis of Options:** * **Option A (Correct):** Elevated levels are a classic biochemical marker of CML due to increased Transcobalamin I production by leukemic cells. * **Option B & D (Incorrect):** Decreased levels are seen in megaloblastic anemias (pernicious anemia, dietary deficiency). In CML, despite high serum levels, there is often "functional" deficiency because the B12 is tightly bound to TCI and less available for tissue uptake. * **Option C (Incorrect):** Normal levels are rare in untreated CML with high tumor burden. **High-Yield Clinical Pearls for NEET-PG:** * **Transcobalamin I (TCI):** Derived from specific granules of granulocytes; elevated in CML. * **Transcobalamin II (TCII):** The primary protein responsible for delivering B12 to tissues (liver, bone marrow). * **LAP Score:** In CML, the Leukocyte Alkaline Phosphatase (LAP) score is characteristically **low**, helping differentiate it from a Leukemoid Reaction (where LAP is high). * **Uric Acid:** Also frequently elevated in CML due to high cell turnover [1].

Q: Which test is used for the detection of the intrinsic pathway of coagulation?

Activated Partial Thromboplastin Time (aPTT). **Explanation:** The coagulation cascade is divided into the intrinsic, extrinsic, and common pathways. The **Activated Partial Thromboplastin Time (aPTT)** is the specific screening test used to evaluate the **intrinsic pathway** (Factors XII, XI, IX, VIII) and the **common pathway** (Factors X, V, II, I). It measures the time taken for a fibrin clot to form after adding an activator (like kaolin or silica) and phospholipids to the plasma. **Analysis of Options:** * **Prothrombin Time (PT):** This tests the **extrinsic pathway** (Factor VII) and the common pathway. It is the investigation of choice for monitoring Warfarin therapy and assessing liver function. * **Bleeding Time (BT):** This measures **primary hemostasis**, specifically platelet function and vascular integrity, rather than the coagulation cascade. It is prolonged in conditions like Von Willebrand Disease and Thrombocytopenia. * **Clotting Time (CT):** While it measures the time for blood to clot, it is a crude, non-specific bedside test (e.g., Lee-White method) that lacks the sensitivity and standardization of aPTT. **High-Yield Clinical Pearls for NEET-PG:** * **Heparin Monitoring:** aPTT is the gold standard for monitoring unfractionated heparin therapy. * **Hemophilia:** Both Hemophilia A (Factor VIII deficiency) and Hemophilia B (Factor IX deficiency) result in an **isolated prolonged aPTT** with a normal PT and BT. * **Vitamin K Deficiency:** Initially prolongs PT (due to the short half-life of Factor VII) before affecting aPTT. * **Mixing Studies:** If aPTT is prolonged, a mixing study is done; correction indicates factor deficiency, while non-correction suggests an inhibitor (e.g., Lupus anticoagulant).

Q: Which of the following acute-phase reactants is responsible for the anemia associated with chronic inflammation?

Hepcidin. **Explanation:** The correct answer is **Hepcidin**. **Mechanism of Anemia of Chronic Disease (ACD):** In the setting of chronic inflammation, pro-inflammatory cytokines (primarily **IL-6**) stimulate the liver to synthesize **Hepcidin**, a key iron-regulatory hormone [1]. Hepcidin induces the degradation of **ferroportin**, the only known iron exporter on the surface of enterocytes and macrophages [1]. This leads to: 1. **Decreased intestinal iron absorption.** 2. **Sequestration of iron** within the reticuloendothelial system (macrophages) [1]. Consequently, iron is "trapped" and unavailable for erythropoiesis, leading to a functional iron deficiency despite adequate total body iron stores. **Analysis of Incorrect Options:** * **A. Fibrinogen:** An acute-phase reactant that promotes erythrocyte sedimentation (ESR) by causing "rouleaux" formation, but it does not affect iron metabolism. * **B. Serum amyloid A (SAA):** An apolipoprotein associated with chronic inflammation; its prolonged elevation can lead to secondary (AA) amyloidosis, not anemia. * **C. C-reactive protein (CRP):** A sensitive but non-specific marker of systemic inflammation used to monitor disease activity; it has no direct role in the pathogenesis of anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Lab Findings in ACD:** Low Serum Iron, **High Ferritin** (as it is also an acute-phase reactant), and **Low TIBC** (Total Iron Binding Capacity). * **Hepcidin vs. Ferroportin:** Remember, Hepcidin is the "brake" on iron flow; high Hepcidin = Low serum iron [1]. * **Treatment:** The primary treatment for ACD is managing the underlying inflammatory condition. Erythropoietin (EPO) levels are often inappropriately low for the degree of anemia in these patients [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 658-662.

Q: Alpha-naphthyl esterase enzyme is present in which type of leukocyte?

Monocyte. **Explanation:** The correct answer is **Monocyte**. **1. Why Monocyte is correct:** Alpha-naphthyl esterase (ANE) is a **non-specific esterase (NSE)**. These enzymes are characteristic markers for cells of the **monocytic lineage**. In cytochemistry, NSE staining is used to differentiate Acute Myeloid Leukemia (AML) subtypes. Monoblasts and monocytes show strong, diffuse positivity for ANE, which is characteristically **inhibited by the addition of sodium fluoride (NaF)**. This is a crucial diagnostic feature for AML-M4 (Myelomonocytic) and AML-M5 (Monocytic) in the FAB classification. **2. Why other options are incorrect:** * **Neutrophils:** These cells are primarily identified by **Myeloperoxidase (MPO)** and **Specific Esterase** (Naphthol AS-D Chloroacetate esterase). They are generally negative for non-specific esterases like ANE. * **Eosinophils:** These are identified by their distinct granules and are MPO positive. They do not typically express diagnostic levels of ANE. * **Lymphocytes:** While some T-cells may show focal, "dot-like" positivity for ANE, it is not their characteristic marker. Diffuse cytoplasmic staining is specific to monocytes. **3. High-Yield Clinical Pearls for NEET-PG:** * **MPO:** Best marker for **Myeloid** differentiation (AML). * **Specific Esterase (CAE):** Marks **Granulocytic** series (Neutrophils). * **Non-Specific Esterase (ANE/ANAE):** Marks **Monocytic** series; inhibited by **Sodium Fluoride**. * **PAS (Periodic Acid Schiff):** Shows "block positivity" in **L1/L2 ALL** and "smudgy/diffuse" positivity in **AML-M6** (Erythroleukemia). * **LAP Score (Leukocyte Alkaline Phosphatase):** Elevated in Leukemoid reaction; decreased in **CML**.

Question 1

What is the typical Vitamin B level in chronic myeloid leukemia?

Accepted Answer

Elevated

Answer

Decreased

Answer

Normal

Answer

Markedly decreased

Question 2

Translocation (8;14) is characteristic of which of the following conditions?

Accepted Answer

Burkitt's lymphoma

Answer

Ataxia telangiectasia

Answer

Acute lymphoblastic leukemia (ALL)

Answer

Chronic myeloid leukemia (CML)

Question 3

What are the essential WHO criteria for polycythemia vera?

Accepted Answer

Tyrosine kinase JAK2 V617F and other mutations

Answer

Low levels of erythropoietin

Answer

Thrombocytosis

Answer

Increased MCV

Question 4

Reilly bodies are seen in which of the following conditions?

Accepted Answer

Hurler disease

Answer

Gangliosidosis

Answer

Behcet's disease

Answer

Gaucher's disease

Question 5

Which test is used for the detection of the intrinsic pathway of coagulation?

Accepted Answer

Activated Partial Thromboplastin Time (aPTT)

Answer

Prothrombin Time (PT)

Answer

Bleeding Time (BT)

Answer

Clotting Time (CT)

Question 6

A patient presents with painless lymphadenopathy. A biopsy reveals binucleated owl-shaped nuclei with a clear vacuolated area. Immunohistochemistry shows positivity for CD15 and CD30. What is the most probable diagnosis?

Accepted Answer

Nodular sclerosis

Answer

Large granular lymphocytic lymphoma

Answer

Lymphocyte depletion type

Answer

Lymphocyte predominant Hodgkin lymphoma

Question 7

Helmet cells are characteristic of which of the following conditions?

Accepted Answer

Hemolytic uremic syndrome

Answer

Polysplenia

Answer

Spherocytosis

Answer

Acanthocytosis

Question 8

Which of the following acute-phase reactants is responsible for the anemia associated with chronic inflammation?

Accepted Answer

Hepcidin

Answer

Fibrinogen

Answer

Serum amyloid A (SAA)

Answer

C-reactive protein (CRP)

Question 9

Alpha-naphthyl esterase enzyme is present in which type of leukocyte?

Accepted Answer

Monocyte

Answer

Neutrophil

Answer

Eosinophil

Answer

Lymphocyte

Question 10

Warm-antibody immunohemolytic anemia is seen in all of the following conditions except?

Accepted Answer

Infectious mononucleosis

Answer

Systemic lupus erythematosus

Answer

Alpha-methyl-dopa ingestion

Answer

Quinidine

Hematopathology — MCQs

Hematopathology — MCQs

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