Hematopathology Practice Questions

Q: Which of the following is the most sensitive indicator for the detection of iron depletion in pregnancy?

Serum ferritin. **Explanation:** **Serum ferritin** is the most sensitive and specific laboratory indicator for detecting iron depletion in pregnancy. It reflects the total body iron stores. In the early stages of iron deficiency (the "pre-latent" phase), ferritin levels drop before any changes occur in serum iron or hemoglobin levels. A serum ferritin level of **<15–30 µg/L** is diagnostic of depleted iron stores, even in the absence of anemia. **Analysis of Incorrect Options:** * **Serum iron (A):** This measures the iron currently bound to transferrin. It is a poor indicator because it fluctuates significantly based on recent dietary intake and shows diurnal variation. * **Serum transferrin (B):** Transferrin (measured via Total Iron Binding Capacity - TIBC) increases during iron deficiency. However, it is less sensitive than ferritin because it only rises significantly once iron stores are already exhausted. * **Serum erythropoietin (C):** This hormone increases in response to hypoxia or significant anemia to stimulate RBC production. It is not a specific or sensitive marker for iron stores. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** Bone marrow aspiration (Prussian blue staining) is the gold standard for assessing iron stores, but **Serum Ferritin** is the investigation of choice (most sensitive non-invasive test). * **The "Rule of 3" in Pregnancy:** * Hb < 11 g/dL (1st & 3rd Trimester) or < 10.5 g/dL (2nd Trimester) defines anemia. * Daily elemental iron requirement: **4–6 mg**. * Prophylactic dose (IFA): **60 mg** elemental iron + **500 µg** folic acid for 180 days. * **Note:** Ferritin is an acute-phase reactant; its levels may be falsely elevated in the presence of systemic infection or inflammation.

Q: Which antibody class is primarily involved in Idiopathic Thrombocytopenic Purpura (ITP)?

IgG. **Explanation:** **Idiopathic Thrombocytopenic Purpura (ITP)**, now more commonly referred to as Immune Thrombocytopenic Purpura, is an acquired autoimmune disorder characterized by isolated thrombocytopenia [2]. **Why IgG is Correct:** The pathogenesis of ITP involves the production of **autoantibodies (predominantly of the IgG class)** directed against platelet surface antigens, most commonly the **GPIIb/IIIa** or **GPIb/IX** complexes. These IgG-coated platelets are recognized by the Fc receptors on splenic macrophages, leading to their premature sequestration and destruction in the **spleen**. **Why other options are incorrect:** * **IgM:** While IgM is the first antibody produced in a primary immune response and is involved in Cold Agglutinin Disease [1], it is not the primary mediator of platelet destruction in ITP. * **IgE:** This antibody class is associated with Type I hypersensitivity reactions (allergies, asthma) and parasitic infections, not autoimmune platelet destruction [2]. * **IgD:** Found on the surface of B-cells, its precise physiological function is less defined, but it plays no role in the pathogenesis of ITP. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Destruction:** The **Spleen** is the primary site of both antibody production and platelet destruction in ITP. * **Bone Marrow Findings:** Characterized by **increased or normal megakaryocytes** (a compensatory response to peripheral destruction). * **First-line Treatment:** Corticosteroids (e.g., Prednisolone). In emergencies or prior to surgery, IVIG (Intravenous Immunoglobulin) is used to "clog" splenic Fc receptors [3]. * **Splenectomy:** Indicated in chronic/refractory cases as it removes the primary site of destruction.

Q: The HAM test is based upon which of the following?

Complement. **Explanation:** The **HAM Test** (Acidified Serum Lysis Test) was historically the gold standard for diagnosing **Paroxysmal Nocturnal Hemoglobinuria (PNH)**. **1. Why Complement is correct:** PNH is an acquired stem cell disorder characterized by a deficiency of **GPI-anchor proteins**, specifically **CD55** (Decay Accelerating Factor) and **CD59** (Membrane Inhibitor of Reactive Lysis). These proteins normally protect red blood cells (RBCs) from destruction by the body's own complement system. In the HAM test, the patient's RBCs are placed in acidified serum (pH 6.2). Acidification activates the **alternative complement pathway**; because PNH cells lack protective proteins, they undergo massive hemolysis. Thus, the test is fundamentally based on **complement-mediated lysis**. **2. Why other options are incorrect:** * **GPI Anchor Proteins:** While the *deficiency* of these proteins causes PNH, the HAM test itself measures the *result* of that deficiency (complement lysis), not the proteins directly. Modern diagnosis uses Flow Cytometry to detect the absence of these proteins. * **Spectrin protein:** Defects in spectrin are associated with **Hereditary Spherocytosis**, not PNH. * **Mannose-binding proteins:** These are involved in the lectin pathway of complement activation but are not the specific trigger or mechanism utilized in the HAM test. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Flow Cytometry (detecting absence of CD55/CD59) has replaced the HAM test. * **Sucrose Lysis Test:** Another screening test for PNH; it also relies on complement activation. * **Triad of PNH:** Hemolytic anemia, Pancytopenia, and Venous thrombosis (often in unusual sites like the Budd-Chiari syndrome). * **Treatment:** Eculizumab (a monoclonal antibody against C5 complement).

Question 1

A 20-year-old male presents in the emergency room with a lymphoma involving the mediastinum that is producing respiratory distress. The lymphocytes are most likely to have cell surface markers characteristic of which of the following?

Accepted Answer

T lymphocytes

Answer

B lymphocytes

Answer

Macrophages

Answer

Langerhans cells

Question 2

Which of the following is the most sensitive indicator for the detection of iron depletion in pregnancy?

Accepted Answer

Serum ferritin

Answer

Serum iron

Answer

Serum transferrin

Answer

Serum erythropoietin

Question 3

A 30-month-old boy presents with jaundice and pallor. Investigations reveal anemia, reticulocytosis, and increased indirect bilirubin. A peripheral blood smear shows red blood cells without central pallor. What additional findings are most likely in this patient?

Accepted Answer

Increased mean corpuscular hemoglobin concentration

Answer

Decreased lactate dehydrogenase

Answer

Increased mean corpuscular volume

Answer

Red blood cell inclusions

Question 4

Both beta chains of haemoglobin are abnormal in which of the following conditions?

Accepted Answer

Thalassemia major

Answer

Heterozygous sickle cell trait

Answer

Homozygous sickle cell anemia

Answer

Megaloblastic anemia

Question 5

A middle-aged man presents with a markedly enlarged tonsil and recurrent infections with serum immunoglobulin deficiency. Chromosome analysis demonstrates a translocation between the immunoglobulin heavy chain locus on chromosome 14 and an unidentified gene on chromosome 8. Which of the following is the most likely cause of his phenotype?

Accepted Answer

The translocation has activated a tumor-promoting gene on chromosome 8.

Answer

The translocation has deleted constant chain exons on chromosome 14 and prevented heavy chain class switching.

Answer

The translocation has deleted the interval containing diversity, and joining regions.

Answer

The translocation has deleted the heavy chain constant chain Cu so that virgin B cells cannot produce IgM on their membranes.

Question 6

A four-year-old boy presented with a two-month history of abdominal pain and fever, a ten-day history of maculopapular rash, and a three-day history of dry cough, dyspnea, and wheezing. On examination, the liver and spleen were enlarged, measuring 4 cm and 3 cm, respectively, below the costal margins. His hemoglobin was 10.0 g/dL, platelet count was 37x10^9/L, and total leukocyte count was 70x10^9/L, with 80% eosinophils. Bone marrow examination revealed a cellular marrow comprising 45% blasts and 34% eosinophils and eosinophilic precursors. The blasts stained negative for myeloperoxidase and non-specific esterase and were positive for CD19, CD10, CD22, and CD20. Which of the following is the most likely diagnosis?

Accepted Answer

Acute lymphoblastic leukemia with hypereosinophilic syndrome

Answer

Biphenotypic acute leukemia (lymphoid and eosinophil lineage)

Answer

Acute eosinophilic leukemia

Answer

Acute myeloid leukemia with eosinophilia

Question 7

Which antibody class is primarily involved in Idiopathic Thrombocytopenic Purpura (ITP)?

Accepted Answer

IgG

Answer

IgM

Answer

IgE

Answer

IgD

Question 8

Which paraneoplastic syndrome is associated with Hodgkin's disease?

Accepted Answer

Cerebellar degenerative disease

Answer

Nephrotic syndrome

Answer

Retinopathy

Answer

Acanthosis nigricans

Question 9

Cabot's ring is seen in which of the following conditions?

Accepted Answer

Megaloblastic anemia

Answer

Sickle cell disease

Answer

Iron deficiency anemia

Answer

Autoimmune hemolytic anemia

Question 10

The HAM test is based upon which of the following?

Accepted Answer

Complement

Answer

GPI Anchor Proteins

Answer

Spectrin protein

Answer

Mannose binding proteins

Hematopathology — MCQs

Hematopathology — MCQs

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