Hematopathology Practice Questions

Q: Pancytopenia with hypercellular marrow is due to all EXCEPT:

Dyskeratosis congenita. **Explanation:** The core concept of this question lies in differentiating between **"Ineffective Hematopoiesis"** (where the marrow is full of cells that fail to mature or enter circulation) and **"Aplastic/Hypoplastic Anemia"** (where the marrow is empty). **1. Why Dyskeratosis Congenita is the Correct Answer:** Dyskeratosis congenita is a congenital form of **Aplastic Anemia** caused by telomere biology disorders. It is characterized by a **hypocellular (empty) bone marrow**. Because the hematopoietic stem cells themselves are depleted, the marrow cannot be hypercellular. It classically presents with the triad of abnormal skin pigmentation, nail dystrophy, and oral leukoplakia. **2. Analysis of Incorrect Options (Causes of Hypercellular Marrow with Pancytopenia):** * **Myelodysplasia (MDS):** This is the classic example of "ineffective hematopoiesis." The marrow is hypercellular or normocellular, but the cells are dysplastic and undergo apoptosis before reaching the peripheral blood. * **Paroxysmal Nocturnal Hemoglobinuria (PNH):** While PNH can be associated with aplastic anemia, it frequently presents with a hypercellular marrow during hemolytic phases or when evolving from/into other myelodysplastic processes. * **Sarcoidosis:** This represents "marrow infiltration" (Myelophthisic anemia). Granulomas infiltrate the bone marrow, leading to a reactive hypercellularity of the non-involved marrow spaces or a "packed" appearance, despite low peripheral counts. **NEET-PG High-Yield Pearls:** * **Pancytopenia + Hypercellular Marrow:** Think Vitamin B12/Folate deficiency (Megaloblastic anemia), MDS, Aleukemic Leukemia, and Subleukemic Leukemia. * **Pancytopenia + Hypocellular Marrow:** Think Aplastic Anemia, Dyskeratosis Congenita, and Fanconi Anemia. * **MDS** is often called "Pre-leukemia" and is the most common cause of macrocytic pancytopenia in the elderly with a hypercellular marrow.

Q: Within how many hours of initiation should a blood transfusion be completed?

1-4 hours. **Explanation:** The standard protocol for blood transfusion dictates that a unit of blood (typically Packed Red Blood Cells) must be completed within **1 to 4 hours** of initiation. **Why 1-4 hours is correct:** * **The 30-minute rule:** Transfusion should ideally start within 30 minutes of the unit leaving the blood bank refrigerator (stored at 2–6°C). * **The 4-hour limit:** Once the blood bag is spiked and exposed to room temperature, the risk of **bacterial proliferation** (especially Gram-negative organisms like *Yersinia enterocolitica*) increases significantly. Furthermore, red cell hemolysis and loss of function occur as the blood warms. Completing the transfusion within 4 hours minimizes the risk of septic transfusion reactions. **Why other options are incorrect:** * **B, C, and D:** Any duration exceeding 4 hours is clinically unsafe. Prolonged exposure to ambient temperature promotes the growth of contaminants and increases the risk of transfusion-transmitted infections (TTI). If a patient cannot tolerate the volume within 4 hours (e.g., congestive heart failure), the unit should be split into smaller aliquots by the blood bank. **High-Yield Clinical Pearls for NEET-PG:** * **Rate of Transfusion:** In a stable patient, the first 15 minutes should be slow (approx. 2 ml/min) to monitor for acute hemolytic reactions. * **Platelets and FFP:** These should be transfused more rapidly, usually within 30–60 minutes. * **Commonest Contaminant:** *Staphylococcus epidermidis* (Gram-positive) is the most common in platelets, while *Yersinia enterocolitica* (Gram-negative) is classically associated with refrigerated RBCs. * **Change of Sets:** The blood administration set (with a 170–200 micron filter) must be changed after every 2 units or every 4 hours to prevent clogging and bacterial growth.

Q: Increased LAP score is seen in which of the following conditions?

Myelofibrosis. **Explanation:** The **Leukocyte Alkaline Phosphatase (LAP) score** (also known as the Neutrophil Alkaline Phosphatase/NAP score) measures the activity of the enzyme alkaline phosphatase within the secondary granules of mature neutrophils. It is a classic marker used to differentiate reactive leukocytosis from neoplastic processes [1]. **1. Why Myelofibrosis is Correct:** In **Myelofibrosis** (a Chronic Myeloproliferative Neoplasm), there is an increase in mature, functioning neutrophils [1], leading to an **elevated LAP score**. Other conditions causing an increased score include the Leukemoid reaction [1], Polycythemia Vera, pregnancy, and acute infections. **2. Analysis of Incorrect Options:** * **Chronic Myeloid Leukemia (CML):** This is the most high-yield contrast. In CML, the LAP score is **characteristically low** because the rapidly proliferating neoplastic cells are enzymatically deficient. * **Paroxysmal Nocturnal Hemoglobinuria (PNH):** This is a stem cell defect where cells lack GPI-anchored proteins. Since LAP is a GPI-anchored enzyme, its levels are **decreased** in PNH. * **Megaloblastic Anemia:** This condition typically presents with pancytopenia and hypersegmented neutrophils; however, the LAP score is generally **decreased** or normal. **High-Yield Clinical Pearls for NEET-PG:** * **LAP Score Range:** Normal range is typically **40–100**. * **Increased LAP (>100):** Leukemoid reaction [1], Myelofibrosis [1], Polycythemia Vera, Pregnancy, Cushing’s syndrome. * **Decreased LAP (<40):** CML (most common cause), PNH, Hypophosphatasia, Aplastic anemia, and AML. * **The "CML vs. Leukemoid" Rule:** If a patient has a high TLC and splenomegaly, a **low LAP** points to CML, while a **high LAP** points to a Leukemoid reaction [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 580-616.

Question 1

Which of the following is an X-linked recessive disorder?

Accepted Answer

Hemophilia A

Answer

Sickle cell anemia

Answer

Thalassemias

Answer

von Willebrand disease

Question 2

Pancytopenia with hypercellular marrow is due to all EXCEPT:

Accepted Answer

Dyskeratosis congenita

Answer

Myelodysplasia

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Sarcoidosis

Question 3

Increased LDH is an important marker for:

Accepted Answer

Bulky disease

Answer

Lymphoma

Answer

Liver metastasis

Answer

Lung metastasis

Question 4

All of the following are causes of pancytopenia with cellular bone marrow except?

Accepted Answer

Dyskeratosis congenita

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Megaloblastic anemia

Answer

Hairy cell leukemia

Question 5

Within how many hours of initiation should a blood transfusion be completed?

Accepted Answer

1-4 hours

Answer

3-6 hours

Answer

4-8 hours

Answer

8-12 hours

Question 6

Which anticoagulant is the preferred choice for performing coagulation studies?

Accepted Answer

Tri-sodium citrate

Answer

EDTA

Answer

Heparin

Answer

Double oxalate

Question 7

Macrophage activation syndrome is characterized by all of the following except which one?

Accepted Answer

Hypoferritinemia

Answer

Hemophagocytosis

Answer

Hypofibrinogenemia

Answer

Hyperglycidemia

Question 8

A 63-year-old man presents with splenomegaly and lymphadenopathy. Immunophenotype was positive for CD19, CD79b, and FMC7. What is the most likely diagnosis?

Accepted Answer

Mantle cell lymphoma (MCL)

Answer

Hairy cell leukemia

Answer

Chronic lymphocytic leukemia (CLL)

Answer

Follicular lymphoma

Question 9

Increased LAP score is seen in which of the following conditions?

Accepted Answer

Myelofibrosis

Answer

Chronic myeloid leukemia

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Megaloblastic anemia

Question 10

The chromosome on which the Rhesus (Rh) blood group gene is located is?

Accepted Answer

Chromosome 1

Answer

Chromosome 3

Answer

Chromosome 6

Answer

Chromosome 9

Hematopathology — MCQs

Hematopathology — MCQs

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