Hematopathology Practice Questions

Q: Basophils are decreased in which of the following conditions?

Cushing's syndrome. **Explanation:** The correct answer is **Cushing’s syndrome**. **1. Why Cushing’s Syndrome is Correct:** Basopenia (a decrease in basophil count) is a characteristic finding in states of **hypercortisolism**, such as Cushing’s syndrome or exogenous steroid administration [1]. Glucocorticoids cause a redistribution of basophils from the peripheral blood into other compartments and inhibit their release from the bone marrow. Additionally, basopenia can be seen in acute stress (due to endogenous cortisol release), hyperthyroidism, and acute hypersensitivity reactions (where basophils degranulate and are sequestered in tissues). **2. Why the Other Options are Incorrect:** * **Polycythemia Vera:** This is a myeloproliferative neoplasm (MPN) characterized by the overproduction of all three cell lines (panmyelosis). Basophilia (increased basophils) is a common diagnostic clue in MPNs. * **Basophilic Leukemia:** This is a rare form of acute myeloid leukemia where primary proliferation consists of basophilic precursors, leading to a massive increase in basophil counts. * **Chronic Myeloid Leukemia (CML):** Basophilia is a hallmark of CML. In fact, a rising basophil count in a known CML patient is a significant clinical sign indicating **disease progression** toward the Accelerated Phase or Blast Crisis. **Clinical Pearls for NEET-PG:** * **Basophilia** is most commonly associated with Myeloproliferative Neoplasms (CML, Polycythemia Vera). * **Cushing’s Mnemonic:** Steroids cause an increase in "Neutrophils" but a decrease in "B.E.L." (**B**asophils, **E**osinophils, and **L**ymphocytes). * **High-Yield Fact:** Basophils contain coarse granules rich in **Heparin and Histamine**. Their membranes express **IgE receptors (FcεRI)**, playing a crucial role in Type I Hypersensitivity reactions. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1127.

Q: What is the minimum percentage of blasts in the peripheral blood or bone marrow required for the diagnosis of Acute Myeloid Leukemia?

20%. ### Explanation The diagnosis of **Acute Myeloid Leukemia (AML)** is primarily based on the quantification of myeloblasts in the bone marrow or peripheral blood. **1. Why 20% is the Correct Answer:** According to the **WHO Classification of Tumors of Haematopoietic and Lymphoid Tissues**, the threshold for diagnosing AML is a blast count of **≥20%**. This criterion distinguishes acute leukemia from Myelodysplastic Syndromes (MDS), where the blast count is typically lower [1]. * **Exception (High-Yield):** If specific genetic abnormalities are present—namely **t(8;21), inv(16), or t(15;17)**—the diagnosis of AML can be made even if the blast count is **less than 20%**. **2. Why Other Options are Incorrect:** * **A (8%) & B (15%):** These percentages fall within the range of **Myelodysplastic Syndromes (MDS)**. Specifically, MDS with excess blasts (MDS-EB-1) involves 5-9% blasts, and MDS-EB-2 involves 10-19% blasts [1]. * **D (25%):** Historically, the **FAB (French-American-British) classification** required a blast count of **≥30%** for a diagnosis of AML. The 25% mark is an arbitrary number that does not align with current or historical diagnostic thresholds. **3. Clinical Pearls for NEET-PG:** * **Auer Rods:** Their presence in blasts is pathognomonic for myeloid lineage (AML), even if the blast count is low. * **MPO (Myeloperoxidase):** The most specific histochemical stain for AML. * **Flow Cytometry:** Essential for lineage markers; **CD33 and CD13** are common pan-myeloid markers. * **Pure Erythroid Leukemia:** A rare subtype where blasts are ≥80% of the marrow cells. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 613-614.

Q: Falsely elevated hemoglobin is seen in which condition?

Burns. **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.

Q: Megaloblastic anemia may be caused by all of the following except?

Copper deficiency. Megaloblastic anemia is a subset of macrocytic anemia characterized by impaired DNA synthesis, leading to a "nuclear-cytoplasmic asynchrony" where the nucleus matures slower than the cytoplasm. **Why Copper Deficiency is the Correct Answer:** Copper deficiency typically causes **Microcytic or Normocytic anemia**, not megaloblastic anemia. It leads to anemia primarily by interfering with iron metabolism (via ceruloplasmin/ferroxidase activity) and can also cause **sideroblastic changes** and neutropenia. While it may mimic myelodysplastic syndrome, it does not classically present with megaloblastic morphology. **Analysis of Other Options:** * **Liver Disease:** Chronic liver disease is a common cause of non-megaloblastic macrocytosis, but in advanced stages, it can lead to megaloblastic changes due to altered lipid metabolism in red cell membranes or associated folate deficiency. * **Thiamine Deficiency:** Specifically, **Thiamine-Responsive Megaloblastic Anemia (TRMA)** or Rogers Syndrome is a rare genetic disorder characterized by megaloblastic anemia, diabetes mellitus, and sensorineural deafness. * **Orotic Aciduria:** This is an autosomal recessive disorder of pyrimidine synthesis. The deficiency of UMP synthase leads to a failure of DNA synthesis, resulting in megaloblastic anemia that is **refractory** to Vitamin B12 and Folate supplementation. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Vitamin B12 and Folate deficiency [1]. * **Drug-induced:** Methotrexate, Phenytoin, and Hydroxyurea are frequent culprits. * **Distinguishing feature:** Look for **hypersegmented neutrophils** (>5 lobes) on a peripheral smear [1]. * **Orotic Aciduria vs. OTC Deficiency:** Both have high orotic acid, but only Orotic Aciduria presents with megaloblastic anemia and *normal* ammonia levels.

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

Heparin toxicity. **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 1

In Beta thalassemia, what is the typical alteration in globin chain production?

Accepted Answer

Decrease in beta chain, increase in alpha chain

Answer

Increase in beta chain, decrease in alpha chain

Answer

Decrease in beta chain, decrease in alpha chain

Answer

Increase in beta chain, increase in alpha chain

Question 2

Basophils are decreased in which of the following conditions?

Accepted Answer

Cushing's syndrome

Answer

Polycythemia

Answer

Basophilic leukemia

Answer

Chronic myeloid leukemia (CML)

Question 3

A 32-year-old man has mild anemia diagnosed on routine testing. His clinical examination is normal, and a blood film reveals some target cells with some red cells having intraerythrocytic crystals. For the above patient with a hemoglobin abnormality, select the most likely diagnosis?

Accepted Answer

HbC disease

Answer

beta-thalassemia major

Answer

HbH disease

Answer

sickle cell disease

Question 4

What is the minimum percentage of blasts in the peripheral blood or bone marrow required for the diagnosis of Acute Myeloid Leukemia?

Accepted Answer

20%

Answer

8%

Answer

15%

Answer

25%

Question 5

Falsely elevated hemoglobin is seen in which condition?

Accepted Answer

Burns

Answer

Chronic renal failure

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Paroxysmal cold hemoglobinuria

Question 6

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?

Accepted Answer

None

Answer

26/13

Answer

(26/13) x 1.41

Answer

Both

Question 7

Megaloblastic anemia may be caused by all of the following except?

Accepted Answer

Copper deficiency

Answer

Liver disease

Answer

Thiamine deficiency

Answer

Orotic aciduria

Question 8

Cryoprecipitate contains which of the following components?

Accepted Answer

Factor IX

Answer

Factor VIII

Answer

Fibrinogen

Answer

von Willebrand factor (vWF)

Question 9

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

Accepted Answer

Two days post-acute bleed

Answer

Resection of the terminal ileum

Answer

Beta-thalassemia minor

Answer

Chronic bleeding duodenal ulcer

Question 10

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

Accepted Answer

Heparin toxicity

Answer

Warfarin toxicity

Answer

Low molecular weight heparin

Answer

Extrinsic coagulation pathway defect

Hematopathology — MCQs

Hematopathology — MCQs

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