Hematopathology — MCQs

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 601: Falsely elevated hemoglobin is seen in which condition?

A. Chronic renal failure
B. Burns (Correct Answer)
C. Paroxysmal nocturnal hemoglobinuria
D. Paroxysmal cold hemoglobinuria

Explanation: **Explanation:** The correct answer is **Burns**. In patients with extensive burns, there is a massive shift of fluid from the intravascular compartment to the interstitial space due to increased capillary permeability. This leads to **hemoconcentration** (a decrease in plasma volume relative to red cell mass) [1]. Consequently, the concentration of hemoglobin appears falsely elevated on a Complete Blood Count (CBC), even though the total red cell mass has not increased. This is a form of "relative polycythemia" [1]. **Analysis of Incorrect Options:** * **Chronic Renal Failure (CRF):** This typically causes **anemia** (decreased hemoglobin) due to the deficiency of Erythropoietin (EPO) produced by the peritubular interstitial cells of the kidney. * **Paroxysmal Nocturnal Hemoglobinuria (PNH) & Paroxysmal Cold Hemoglobinuria (PCH):** Both are types of hemolytic anemias. Intravascular hemolysis leads to a **decrease** in hemoglobin levels. While free hemoglobin is present in the plasma (hemoglobinemia), the automated analyzers measure total hemoglobin, which will be low due to red cell destruction. **High-Yield Clinical Pearls for NEET-PG:** * **Other causes of falsely elevated Hb:** Hyperlipidemia (lipemic index), severe leukocytosis (>100,000/µL), and presence of paraproteins (e.g., Multiple Myeloma) which increase turbidity in the spectrophotometric assay. * **Rule of Three:** In a normal CBC, Hemoglobin x 3 ≈ Hematocrit (Hct). If this ratio is significantly disturbed, suspect an analytical error or hemoconcentration. * **Management Tip:** In burn patients, the elevated hematocrit/hemoglobin is used as a guide for fluid resuscitation (Parkland Formula) rather than a sign of true polycythemia. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 663-664.

Question 602: A patient's prothrombin time (PT) is 26 seconds, the control PT is 13 seconds, and the sensitivity index is 1.41. What will be the INR of this patient?

A. 26/13
B. (26/13) x 1.41
C. Both
D. None (Correct Answer)

Explanation: ### Explanation The International Normalized Ratio (INR) is a standardized way of reporting Prothrombin Time (PT) to ensure consistency across different laboratories using various reagents (thromboplastins). The mathematical formula for INR is: **INR = (Patient’s PT / Control PT) ^ ISI** *(Where ISI = International Sensitivity Index)* #### 1. Why the correct answer is "None" In this question, the Patient PT is 26s, Control PT is 13s, and the ISI is 1.41. Applying the formula: **INR = (26 / 13) ^ 1.41 = (2) ^ 1.41** Option A (26/13) represents only the **Prothrombin Ratio (PR)**, ignoring the ISI. Option B (26/13 x 1.41) incorrectly **multiplies** the ratio by the ISI instead of using it as an **exponent**. Since neither option correctly applies the exponential formula, the correct answer is **None**. #### 2. Analysis of Incorrect Options * **Option A:** This is the Prothrombin Ratio. It is only equal to the INR if the ISI is exactly 1.0. * **Option B:** This is a common mathematical trap. The ISI is a power function, not a multiplier. Multiplying leads to a significantly different value than exponentiation. #### 3. NEET-PG High-Yield Pearls * **ISI (International Sensitivity Index):** This value indicates how sensitive a particular batch of thromboplastin is compared to an international reference. A lower ISI (closer to 1.0) means the reagent is more sensitive. * **Clinical Use:** INR is primarily used to monitor **Warfarin (Oral Anticoagulant) therapy** [1]. It is **not** used to evaluate liver function or screening for bleeding disorders (where PT in seconds is preferred). * **Extrinsic Pathway:** PT/INR assesses the Extrinsic and Common pathways (Factors VII, X, V, II, and I) [2]. * **Target INR:** For most patients on Warfarin (e.g., Atrial Fibrillation or DVT), the target INR is typically **2.0–3.0**. For mechanical heart valves, it is **2.5–3.5**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 582-626. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 128-130.

Question 603: Cryoprecipitate contains which of the following components?

A. Factor VIII
B. Factor IX (Correct Answer)
C. Fibrinogen
D. von Willebrand factor (vWF)

Explanation: ### Explanation **Cryoprecipitate** is a concentrated blood product prepared by thawing one unit of Fresh Frozen Plasma (FFP) at 1–6°C and collecting the resulting cold-insoluble precipitate. **Why the Correct Answer is Factor IX:** The question asks which component is **NOT** found in cryoprecipitate (or which is the exception). Cryoprecipitate is specifically rich in high-molecular-weight proteins that precipitate in the cold. **Factor IX** is a smaller protein that remains in the supernatant (cryo-poor plasma) after the precipitate is removed [1]. Therefore, cryoprecipitate is **ineffective** for treating Hemophilia B (Factor IX deficiency); these patients require FFP or Factor IX concentrates. **Analysis of Other Options:** * **Factor VIII (Option A):** Cryoprecipitate contains approximately 80–150 units of Factor VIII per bag [1]. It was historically the mainstay for Hemophilia A. * **Fibrinogen (Option C):** This is the most abundant component (approx. 150–250 mg) [1]. Cryoprecipitate is the primary treatment for hypofibrinogenemia or Dysfibrinogenemia. * **von Willebrand factor (Option D):** It contains significant amounts of vWF, making it a treatment option for von Willebrand Disease when specific concentrates are unavailable [1]. * *Note: It also contains Factor XIII and Fibronectin.* **High-Yield Clinical Pearls for NEET-PG:** * **Storage:** Stored at **-18°C or colder** for up to 1 year. Once thawed, it must be used within 6 hours (or 4 hours if pooled). * **Indications:** Primarily used for **Hypofibrinogenemia** (e.g., in DIC or massive transfusion) and **Factor XIII deficiency**. * **Dosage:** One unit of cryoprecipitate typically raises the fibrinogen level by **5–10 mg/dL** in an average adult. * **Mnemonic (Components):** **"1, 8, 13, vWF"** (Factor I/Fibrinogen, Factor VIII, Factor XIII, and von Willebrand Factor). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 668-671.

Question 604: A normal Mean Corpuscular Volume (MCV) would be expected in which of the following conditions?

A. Resection of the terminal ileum
B. Beta-thalassemia minor
C. Two days post-acute bleed (Correct Answer)
D. Chronic bleeding duodenal ulcer

Explanation: ### Explanation **Correct Option: C. Two days post-acute bleed** The Mean Corpuscular Volume (MCV) measures the average size of red blood cells (RBCs). In an **acute hemorrhage**, the body loses whole blood (both cells and plasma) [1]. Immediately and for a short period following the event, the remaining RBCs are of normal size and hemoglobin content. Therefore, acute blood loss initially presents as a **Normocytic Normochromic Anemia** [2]. It takes time for the bone marrow to mount a reticulocytosis response (which would increase MCV) or for iron deficiency to develop (which would decrease MCV). **Incorrect Options:** * **A. Resection of the terminal ileum:** The terminal ileum is the primary site for Vitamin B12 absorption. Resection leads to B12 deficiency, resulting in impaired DNA synthesis and **Megaloblastic Macrocytic Anemia (High MCV).** [3] * **B. Beta-thalassemia minor:** This is a quantitative defect in globin chain synthesis [1]. It results in **Microcytic Hypochromic Anemia (Low MCV)**, typically characterized by a very low MCV disproportionate to the mild anemia (Mentzer Index < 13) [4]. * **D. Chronic bleeding duodenal ulcer:** Unlike acute bleeds, chronic slow blood loss leads to the depletion of iron stores [1]. Once iron is exhausted, heme synthesis is impaired, leading to **Microcytic Hypochromic Anemia (Low MCV)** [4]. **NEET-PG High-Yield Pearls:** * **Mentzer Index:** MCV/RBC count. If **<13**, suggests Thalassemia; if **>13**, suggests Iron Deficiency Anemia (IDA). * **Anemia of Chronic Disease:** Usually normocytic, but can become microcytic in 30% of cases. * **Reticulocytosis:** Reticulocytes are larger than mature RBCs; hence, a high reticulocyte count (e.g., in hemolytic anemia or 5–7 days post-bleed) will **elevate the MCV.** **References:** [1] Kumar v, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 638. [2] Kumar v, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 638-639. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 588-589. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Question 605: What is the characteristic peripheral smear pattern in iron deficiency anemia?

A. Normocytic normochromic
B. Hypochromic normocytic
C. Hypochromic microcytic (Correct Answer)
D. Normochromic microcytic

Explanation: ### Explanation **Correct Answer: C. Hypochromic microcytic** In Iron Deficiency Anemia (IDA), the fundamental defect is a lack of iron, which is essential for heme synthesis. When iron stores are depleted, hemoglobin production decreases. 1. **Microcytosis (Low MCV):** To compensate for the lack of hemoglobin, erythroid precursors undergo additional cell divisions in the bone marrow, resulting in smaller red blood cells [1]. 2. **Hypochromia (Low MCHC):** Since hemoglobin provides the red color to the cell, its deficiency leads to an increased central pallor (greater than 1/3rd of the cell diameter) [1]. **Analysis of Incorrect Options:** * **A. Normocytic normochromic:** This pattern is typical of acute blood loss, anemia of chronic disease (early stages), or hemolytic anemias. * **B & D. Hypochromic normocytic / Normochromic microcytic:** These are transitional states. While microcytosis usually precedes hypochromia in early IDA, the classic, fully developed peripheral smear pattern diagnostic of IDA is always hypochromic microcytic [1]. **NEET-PG High-Yield Pearls:** * **First Sign of IDA:** The earliest laboratory sign is a **decrease or Serum Ferritin** (most sensitive). * **Earliest Change in CBC:** An increase in **RDW (Red Cell Distribution Width)**, indicating anisocytosis [1]. * **Pencil Cells:** Elongated red cells (elliptocytes) are a classic morphological finding in IDA [1]. * **Mentzer Index:** (MCV/RBC count) < 13 suggests Thalassemia trait, while **> 13 suggests IDA**. * **Gold Standard:** Bone marrow aspiration showing absent stainable iron (Prussian Blue/Perl’s stain), though rarely performed clinically. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Question 606: Which coagulation test is used to assess the effects of heparin therapy or toxicity?

A. Warfarin toxicity
B. Low molecular weight heparin
C. Heparin toxicity (Correct Answer)
D. Extrinsic coagulation pathway defect

Explanation: **Explanation:** The correct answer is **Heparin toxicity**. The **Activated Partial Thromboplastin Time (aPTT)** is the primary laboratory test used to monitor the anticoagulant effect of Unfractionated Heparin (UFH). Heparin acts by binding to Antithrombin III, which then inactivates Thrombin (Factor IIa) and Factor Xa [1]. Since these factors are integral to the intrinsic and common pathways, heparin significantly prolongs the aPTT [1]. In cases of heparin toxicity (overdose), the aPTT will be markedly elevated, guiding the administration of the antidote, Protamine Sulfate. **Analysis of Incorrect Options:** * **Option A (Warfarin toxicity):** Warfarin inhibits Vitamin K epoxide reductase, affecting Factors II, VII, IX, and X [1]. Its effect is monitored using **Prothrombin Time (PT)** and **INR**, not aPTT. * **Option B (Low Molecular Weight Heparin):** LMWH (e.g., Enoxaparin) has a higher ratio of anti-Xa to anti-IIa activity. It does not significantly prolong aPTT. Monitoring, if required (e.g., in renal failure or pregnancy), is done via the **Anti-Xa assay**. * **Option D (Extrinsic pathway defect):** The extrinsic pathway (Factor VII) is assessed using **Prothrombin Time (PT)** [1]. aPTT assesses the intrinsic (XII, XI, IX, VIII) and common pathways. **High-Yield Clinical Pearls for NEET-PG:** * **Mixing Studies:** If aPTT is prolonged, a mixing study is done. If it corrects, it indicates a **factor deficiency** (e.g., Hemophilia); if it doesn't correct, it indicates an **inhibitor** (e.g., Lupus anticoagulant). * **Antidote:** The specific neutralizer for Heparin is **Protamine Sulfate**. * **Therapeutic Range:** For UFH, the goal is usually an aPTT of 1.5 to 2.5 times the control value. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 582-626.

Question 607: Which of the following statements are true regarding Burkitt's lymphoma?

A. It is a B cell lymphoma.
B. It is associated with the 6;14 translocation.
C. It can present as an abdominal mass. (Correct Answer)
D. Radiotherapy is used in its treatment.

Explanation: **Explanation:** Burkitt’s Lymphoma (BL) is a highly aggressive B-cell non-Hodgkin lymphoma characterized by the translocation of the **MYC gene**. **Why Option C is Correct:** Burkitt’s lymphoma is categorized into three clinical variants: Endemic (African), Sporadic (Non-African), and Immunodeficiency-associated. The **Sporadic form** most commonly involves the **ileocecal region and peritoneum**, frequently presenting as a rapidly enlarging **abdominal mass**, pain, or bowel obstruction [1]. **Analysis of Incorrect Options:** * **Option A:** While BL is indeed a B-cell lymphoma, the question asks for the "most true" or specific clinical characteristic in many exam patterns. However, in a "multiple true" context, A is technically correct. In the context of this specific single-choice question, the clinical presentation (Option C) is the classic examiner focus. * **Option B:** BL is associated with **t(8;14)** in 80% of cases, involving the *c-MYC* gene on chromosome 8 and the *IgH* gene on chromosome 14. Other variants include t(2;8) and t(8;22). t(6;14) is not associated with BL. * **Option D:** BL is a systemic disease with a very high proliferation rate (nearly 100% Ki-67 index). Therefore, it is primarily treated with **intensive chemotherapy** (e.g., CODOX-M/IVAC) [1]. Radiotherapy is rarely used as a primary modality. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** "Starry-sky" appearance [1] (tingible body macrophages against a sea of cohesive B-cells). * **Genetics:** Overexpression of **c-MYC** (a transcription factor). * **Endemic Form:** Strongly associated with **EBV**; typically presents as a **jaw mass** [1]. * **Cytology:** Medium-sized cells with basophilic cytoplasm and prominent lipid vacuoles. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 605-606.

Question 608: Leukostasis is common in which of the following hematological conditions?

A. ALL
B. AML (Correct Answer)
C. CML
D. CLL

Explanation: **Explanation:** **Leukostasis** is a medical emergency characterized by an extremely high white blood cell (WBC) count (typically >100,000/µL) that leads to increased blood viscosity and tissue hypoperfusion. **Why AML is the correct answer:** Leukostasis is most frequently associated with **Acute Myeloid Leukemia (AML)**, particularly the M4 (Myelomonocytic) and M5 (Monocytic) subtypes [1]. The underlying pathophysiology involves the nature of the cells: **Myeloblasts** are significantly larger than lymphoblasts and are less deformable. They have a high metabolic rate and express adhesion molecules that interact with the vascular endothelium, leading to "plugging" of the microvasculature, especially in the lungs (respiratory distress) and brain (altered mental status). **Analysis of Incorrect Options:** * **ALL:** While leukostasis can occur in Acute Lymphoblastic Leukemia, it is much rarer than in AML. Lymphoblasts are smaller and more deformable than myeloblasts, allowing them to pass through capillaries more easily even at high counts. * **CML:** In the chronic phase of CML, WBC counts can exceed 300,000/µL without causing leukostasis [2]. This is because the circulating cells are mostly **mature** neutrophils, which are smaller and more flexible than blasts. * **CLL:** Similar to CML, the cells in CLL are mature, small lymphocytes. Even with very high counts (hyperleukocytosis), these cells rarely cause symptomatic leukostasis. **Clinical Pearls for NEET-PG:** * **Threshold:** Leukostasis is usually seen when the Blast count >100,000/µL in AML, but >400,000/µL in ALL. * **Clinical Presentation:** Most common symptoms are **dyspnea** (pulmonary involvement) and **neurological deficits** (CNS involvement). * **Treatment:** Immediate management includes aggressive hydration and **Leukapheresis** or hydroxyurea to rapidly reduce the cell count. * **Contraindication:** Avoid blood transfusions initially, as they increase viscosity and can worsen leukostasis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 621-622. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 611-612.

Question 609: Heinz bodies are composed of?

A. DNA
B. RNA
C. Iron
D. Denatured haemoglobin (Correct Answer)

Explanation: **Explanation:** **Heinz bodies** are inclusions within red blood cells composed of **denatured (precipitated) hemoglobin** [1]. 1. **Why Option D is Correct:** Heinz bodies form when hemoglobin undergoes oxidative damage. In conditions like **G6PD deficiency**, the lack of NADPH prevents the reduction of glutathione. Without reduced glutathione, reactive oxygen species (ROS) attack the globin chains of hemoglobin, causing them to denature and form insoluble precipitates [1]. These precipitates attach to the RBC membrane, damaging it and leading to splenic removal, which results in "Bite cells" [1]. 2. **Why Other Options are Incorrect:** * **A. DNA:** Inclusions of nuclear DNA remnants are called **Howell-Jolly bodies**, typically seen in asplenia or megaloblastic anemia. * **B. RNA:** Ribosomal RNA precipitates are known as **Basophilic stippling**, seen in lead poisoning, thalassemias, and sideroblastic anemia. * **C. Iron:** Inclusions of non-heme iron are called **Pappenheimer bodies** (seen on Wright stain) or **Siderotic granules** (seen on Prussian blue stain), characteristic of sideroblastic anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Heinz bodies are **NOT visible on routine Leishman or Romanowsky stains**. They require **Supravital stains** (e.g., Crystal Violet, Brilliant Cresyl Blue, or Methylene Blue). * **Morphology:** They appear as dark, round granules attached to the inner RBC membrane. * **Clinical Association:** Most commonly associated with **G6PD deficiency**, but also seen in unstable hemoglobin variants (e.g., Hb Cologne) and chronic drug-induced oxidative stress [1]. * **Sequence of events:** Heinz bodies → Splenic macrophages "bite" them out → **Bite cells (Degmacytes)** [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. 642-643.

Question 610: How can Hodgkin's lymphoma be distinguished from non-Hodgkin's lymphomas?

A. Presence of Reed-Sternberg cells
B. Presence of systemic manifestations
C. Occurrence predominantly in young adults
D. All of the above (Correct Answer)

Explanation: This question highlights the classic clinicopathological distinctions between Hodgkin’s Lymphoma (HL) and Non-Hodgkin’s Lymphoma (NHL). [1] **Explanation of the Correct Answer:** The correct answer is **D (All of the above)** because HL and NHL differ significantly in their cellular morphology, clinical presentation, and epidemiology. 1. **Presence of Reed-Sternberg (RS) Cells:** This is the pathological hallmark of HL [1]. RS cells are large, multinucleated B-cells (typically "owl-eye" appearance) surrounded by a reactive background of non-neoplastic inflammatory cells [2]. In contrast, NHL is characterized by a monoclonal proliferation of malignant lymphoid cells without RS cells. 2. **Systemic Manifestations:** HL is frequently associated with **"B-symptoms"** (fever, night sweats, and weight loss) and Pel-Ebstein fever [3]. While NHL can present with these, they are much more characteristic and common in the early stages of HL [4]. 3. **Age Distribution:** HL shows a unique **bimodal age distribution**, peaking first in young adults (15–35 years) and again in older adults (>55 years) [1]. NHL generally increases in incidence steadily with age and is more common in older populations. **High-Yield NEET-PG Pearls:** * **Spread:** HL spreads in a **contiguous** (predictable) fashion along lymph node chains; NHL is often non-contiguous and involves extranodal sites (MALT, CNS, Skin) more frequently [1], [4]. * **RS Cell Markers:** Classic RS cells are typically **CD15+ and CD30+**, but **CD45- and CD20-**. * **Alcohol-induced pain:** A rare but highly specific clinical sign for Hodgkin’s Lymphoma is pain in the lymph nodes after alcohol consumption [4]. * **Prognosis:** HL generally has a better cure rate compared to many aggressive subtypes of NHL [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 614-616. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 616. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 616-618. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 557-559.

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Thrombotic Disorders

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