Hematopathology Practice Questions

Q: Which of the following is not associated with a high reticulocyte count?

Megaloblastic anemia. The **Reticulocyte Count** is a direct reflection of the bone marrow's erythropoietic activity. A high count (reticulocytosis) indicates that the marrow is healthy and responding to a decrease in red blood cells (RBCs) or a stimulus like erythropoietin. **Why Megaloblastic Anemia is the Correct Answer:** Megaloblastic anemia (caused by Vitamin B12 or Folate deficiency) is characterized by **ineffective erythropoiesis** [1]. Although the bone marrow is hypercellular, the RBC precursors die within the marrow due to defective DNA synthesis. Consequently, the marrow cannot release mature cells or reticulocytes into the peripheral blood, leading to a **low reticulocyte count** (reticulocytopenia) [1]. **Analysis of Incorrect Options:** * **Acute Bleed:** Following a sudden loss of blood, the body increases erythropoietin production, stimulating a healthy marrow to release young RBCs (reticulocytes) within 3–5 days to compensate. * **Hemolytic Anemia:** In conditions like G6PD deficiency or Hereditary Spherocytosis, RBCs are destroyed prematurely. The marrow remains functional and compensates by significantly increasing reticulocyte production. * **Response to Treatment:** When a nutritional deficiency (Iron, B12, or Folate) is treated, the "block" in RBC production is removed, leading to a "reticulocyte flare" (usually peaking at 5–10 days), signaling a positive response to therapy. **NEET-PG High-Yield Pearls:** * **Corrected Reticulocyte Count (CRC):** In anemia, always use CRC [% Retic × (Patient Hct / Normal Hct)] to assess marrow response accurately. * **Reticulocyte Production Index (RPI):** An RPI > 2% indicates an adequate marrow response (Hemolysis/Hemorrhage); an RPI < 2% indicates an inadequate response (Hypoproliferative/Megaloblastic anemias). * **Supravital Stains:** Reticulocytes are visualized using **New Methylene Blue** or **Brilliant Cresyl Blue**, which stain the residual ribosomal RNA.

Q: All of the following statements regarding pathological inclusions are true EXCEPT?

Cabot rings occur in iron deficiency anemia.. **Explanation:** The correct answer is **C**. **Cabot rings** are thin, red-purple, thread-like strands found in the shape of a loop or figure-of-eight within erythrocytes. They are remnants of the **mitotic spindle** (microtubules), not iron. While they are seen in megaloblastic anemia, lead poisoning, and myelodysplastic syndromes, they are **not** a characteristic feature of iron deficiency anemia. **Analysis of other options:** * **A. Howell-Jolly bodies:** These are small, round, purple nuclear remnants (DNA). Normally, the spleen’s "pitting" function removes them [1]. Therefore, they are classic markers of **splenectomy** or functional asplenia (e.g., Sickle Cell Anemia) [2]. * **B. Basophilic stippling:** This represents coarse or fine blue granules (precipitated **ribosomes/RNA**). It is a hallmark of **lead poisoning** (due to inhibition of pyrimidine 5'-nucleotidase) and is also seen in thalassemias and sideroblastic anemia. * **D. Heinz bodies:** These are inclusions of **denatured hemoglobin** [1]. While most commonly associated with **G6PD deficiency** (oxidative stress), they are also seen in **thalassemias** due to the precipitation of excess globin chains [1]. **NEET-PG High-Yield Pearls:** * **Pappenheimer bodies:** Siderotic granules (iron) seen in Sideroblastic anemia; confirmed with **Prussian Blue stain**. * **Heinz bodies** require **Supravital stains** (Crystal violet/Methylene blue) to be visualized; they are not seen on routine Leishman/Wright stains [1]. * **Bite cells (Degmacytes):** Result from splenic macrophages plucking out Heinz bodies [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. 642-654. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 652-654.

Q: The Rumpel Leede test measures what?

Capillary fragility. The **Rumpel-Leede test**, also known as the **Capillary Fragility Test** or the Tourniquet Test, is a clinical diagnostic tool used to assess the structural integrity of capillary walls and platelet function. **Why Option C is correct:** The test involves applying a blood pressure cuff to the upper arm and inflating it to a point midway between the systolic and diastolic blood pressure for 5 minutes. If the capillaries are fragile or if there is significant thrombocytopenia, the increased intraluminal pressure causes them to rupture, resulting in the formation of **petechiae** [1]. A positive test (usually >10–20 petechiae in a 1-inch square area) indicates **capillary fragility**. It is classically positive in conditions like **Dengue Hemorrhagic Fever**, Vitamin C deficiency (Scurvy), and various thrombocytopenic states. **Why other options are incorrect:** * **Bleeding Time (A):** Measures the time taken for a standardized skin wound to stop bleeding; it assesses platelet adhesion and aggregation, not capillary wall strength. * **Platelet Count (B):** This is a quantitative laboratory measurement (CBC) and cannot be determined by a physical tourniquet test, though low counts often lead to a positive Rumpel-Leede result [2]. * **ESR (D):** Erythrocyte Sedimentation Rate is a non-specific marker of inflammation and is unrelated to capillary integrity. **High-Yield Clinical Pearls for NEET-PG:** * **Dengue:** The Tourniquet Test is a key WHO criterion for the clinical diagnosis of Dengue. * **Scurvy:** Defective collagen synthesis leads to weak vessel walls and a positive Rumpel-Leede test. * **Hess Test:** Another name for the Rumpel-Leede test. * **Limitation:** It is not specific; it can be positive in both qualitative platelet defects (e.g., Glanzmann's) and quantitative defects (thrombocytopenia).

Q: Which of the following is a feature of disseminated intravascular coagulation (DIC)?

Reduced plasma fibrinogen. **Explanation:** Disseminated Intravascular Coagulation (DIC) is a complex consumptive coagulopathy characterized by systemic activation of the coagulation cascade [1]. This leads to the widespread formation of fibrin microthrombi, which paradoxically results in the **exhaustion of clotting factors and platelets**, leading to severe hemorrhage. **Why Option B is Correct:** In DIC, there is massive conversion of fibrinogen to fibrin due to excess thrombin [1]. Simultaneously, secondary fibrinolysis is activated, leading to the breakdown of fibrinogen. This dual process results in **hypofibrinogenemia (reduced plasma fibrinogen)**, which is a hallmark laboratory finding of the condition [1]. **Why Other Options are Incorrect:** * **A & D (Normal PT and Clotting Time):** Because DIC consumes clotting factors (Factors V, VIII, and X), the **Prothrombin Time (PT)**, **Activated Partial Thromboplastin Time (aPTT)**, and **Clotting Time (CT)** are all characteristically **prolonged**, not normal [1][2]. * **C (Normal Platelet Count):** Platelets are rapidly consumed during the formation of microthrombi [3]. Therefore, **thrombocytopenia** (reduced platelet count) is a consistent feature of DIC [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Best Screening Test:** Platelet count and PT (both will be abnormal) [1][2]. * **Most Specific Test:** Elevated **D-dimer** or Fibrin Degradation Products (FDPs) [1]. * **Peripheral Smear:** Presence of **Schistocytes** (fragmented RBCs) due to microangiopathic hemolytic anemia (MAHA). * **Common Triggers:** Sepsis (most common), Obstetric complications (Abruptio placentae), and Malignancy (APML - M3) [1].

Q: The Kleihauer Betke test for detecting fetal erythrocytes is based on which principle?

HbF is more resistant to acid elution than HbA.. ### Explanation The **Kleihauer-Betke (KB) test** is the gold standard for quantifying the volume of **fetal-maternal hemorrhage (FMH)**. **1. Why Option C is Correct:** The test relies on the biochemical difference between **Hemoglobin F (fetal)** and **Hemoglobin A (adult)**. When a maternal blood smear is exposed to an **acid bath (citrate-phosphate buffer)**, adult hemoglobin (HbA) is unstable and leaches out of the cells, leaving behind empty "ghost cells." In contrast, fetal hemoglobin (HbF) is **acid-resistant** and remains within the erythrocytes. When a counterstain (like eosin or erythrosin) is applied, the fetal cells take up the stain and appear bright pink/dark, while maternal cells appear pale or colorless. **2. Analysis of Incorrect Options:** * **Option A:** Cell size is not the distinguishing factor; both fetal and adult RBCs are similar in size (though fetal RBCs have a slightly higher MCV, it is not the basis for this chemical test). * **Option B:** While HbF does have a higher oxygen affinity than HbA, this physiological property is used for gas exchange in utero, not for laboratory elution tests. * **Option D:** The staining difference is a *result* of the acid elution process, not a primary difference in the innate staining affinity of the hemoglobins themselves. **3. Clinical Pearls for NEET-PG:** * **Indications:** Used to calculate the dose of **Rh Anti-D immunoglobulin** required after a large FMH (e.g., trauma, placental abruption). * **Formula:** Volume of FMH (mL) = (Number of fetal cells / Total cells counted) × Maternal Blood Volume (approx. 5000 mL). * **Dosage:** 300 µg of Anti-D neutralizes **30 mL** of fetal whole blood (or 15 mL of packed RBCs). * **Limitation:** The test is unreliable in mothers with conditions that elevate HbF, such as **Sickle Cell Anemia or Thalassemia**.

Question 1

Which of the following is not associated with a high reticulocyte count?

Accepted Answer

Megaloblastic anemia

Answer

Acute bleed

Answer

Hemolytic anemia

Answer

Response to treatment in nutrition deficiency anemia

Question 2

All of the following statements regarding pathological inclusions are true EXCEPT?

Accepted Answer

Cabot rings occur in iron deficiency anemia.

Answer

Howell-Jolly bodies occur in splenectomized patients.

Answer

Basophilic stippling is seen in lead intoxication.

Answer

Heinz bodies are seen in thalassemia.

Question 3

A 15-year-old boy presented with anemia and jaundice. On examination, his hemoglobin was 6 g/dL, USG showed gallstones, and the peripheral smear showed bite cells. What is the most likely diagnosis?

Accepted Answer

Hereditary ovalocytosis

Answer

Hereditary acanthocytosis

Answer

Hereditary spherocytosis

Answer

Hereditary xerocytosis

Question 4

Castleman's disease is associated with a defect in which of the following interleukins?

Accepted Answer

Interleukin 6 (IL-6)

Answer

Interleukin 1 (IL-1)

Answer

Interleukin 4 (IL-4)

Answer

Interleukin 8 (IL-8)

Question 5

Autopsy of the spleen of a patient with portal hypertension shows Gamna-Gandy bodies. These bodies are characterized by the presence of hemosiderin and which of the following?

Accepted Answer

Calcium ions (Ca++)

Answer

Sodium ions (Na+)

Answer

Magnesium ions (Mg++)

Answer

Calcium (Ca)

Question 6

The Rumpel Leede test measures what?

Accepted Answer

Capillary fragility

Answer

Bleeding time

Answer

Platelet count

Answer

ESR

Question 7

A 50-year-old woman presents with easy fatigability and a dragging sensation in her abdomen for the past 5 months. Physical examination reveals marked splenomegaly without lymphadenopathy. Laboratory studies show a total WBC count of 250,000/mm3 with a differential count showing 64% segmented neutrophils, 11% band neutrophils, 7% metamyelocytes, 5% myelocytes, 4% myeloblasts, 3% lymphocytes, 2% basophils, 2% eosinophils, and 2% monocytes. A bone marrow biopsy reveals a t(9;22) translocation. Which of the following modes of action of a medication is most likely to result in a complete remission in this patient?

Accepted Answer

Inhibiting tyrosine kinase activity

Answer

Activating cellular caspases

Answer

Antibody binding to EGF receptors

Answer

Delivering normal p53 into cells via viral vectors

Question 8

A 12-year-old girl who underwent a bone marrow transplant as part of therapy for ALL presents with pulmonary complaints and neurologic findings. Lung biopsy reveals a granulomatous vasculitis with associated atypical lymphocytes. Clonality studies reveal a monoclonal B cell population with associated polyclonal T cells. What infectious agent is related to this diagnosis?

Accepted Answer

EBV

Answer

CMV

Answer

HPV

Answer

HHV-8

Question 9

Which of the following is a feature of disseminated intravascular coagulation (DIC)?

Accepted Answer

Reduced plasma fibrinogen

Answer

Normal prothrombin time

Answer

Normal platelet count

Answer

Normal clotting time

Question 10

The Kleihauer Betke test for detecting fetal erythrocytes is based on which principle?

Accepted Answer

HbF is more resistant to acid elution than HbA.

Answer

Adult erythrocytes are larger than fetal erythrocytes.

Answer

HbA has higher oxygen affinity than HbF.

Answer

HbA takes up erythrosin stain less effectively than HbF.

Hematopathology — MCQs

Hematopathology — MCQs

On this page

Practice by Chapter

Want unlimited practice?