Hematopathology Practice Questions

Q: All of the following are true about anticoagulants except?

Sodium diphosphate helps in the synthesis of ATP. This question tests the knowledge of blood preservation and the specific roles of additives in anticoagulant solutions. ### **Explanation of the Correct Option** **Option C is the incorrect statement (and thus the correct answer).** In blood preservation solutions like CPD (Citrate Phosphate Dextrose), **Sodium Acid Phosphate (NaH₂PO₄)** is added primarily as a **buffer** to maintain the pH of the stored blood. It prevents the excessive drop in pH caused by the accumulation of lactic acid (a byproduct of glycolysis). While ATP is vital for red cell survival, its synthesis is primarily supported by **Dextrose** (which provides the energy source) and **Adenine** (which provides the substrate for ATP synthesis). ### **Analysis of Other Options** * **Option A (CPDA-1):** Citrate Phosphate Dextrose Adenine-1 allows for a storage life of **35 days**. The addition of Adenine to the standard CPD solution improves ATP regeneration, extending the shelf life from 21 to 35 days. * **Option B (SAGM):** Saline-Adenine-Glucose-Mannitol is an additive solution used after removing plasma. It provides optimal nutrients and membrane stabilization (via Mannitol), extending the shelf life to **42 days**. * **Option D (Citrate):** Citrate (Sodium Citrate) is the primary anticoagulant in all standard blood bags. It works by **chelating (binding) ionized calcium**, which is Factor IV in the coagulation cascade, thereby preventing clot formation. ### **High-Yield Clinical Pearls for NEET-PG** * **Citrate:** Anticoagulant (Calcium chelator). * **Dextrose:** Energy source for glycolysis. * **Phosphate:** Buffer (maintains pH). * **Adenine:** Maintains high ATP levels (extends life to 35 days). * **2,3-DPG:** Levels decrease during storage, leading to an increased affinity of hemoglobin for oxygen (Left shift of the Oxygen Dissociation Curve). * **Storage Temperature:** Whole blood/PRBCs must be stored at **2–6°C**.

Q: A child died soon after birth. On examination, there was hepatosplenomegaly and edema all over the body. What is the most probable diagnosis?

Alpha Thalassemia. ### Explanation The clinical presentation of a neonate with generalized edema (anasarca) and hepatosplenomegaly who dies shortly after birth is classic for **Hydrops Fetalis**. **Why Alpha Thalassemia is Correct:** The most severe form of Alpha Thalassemia is **Hb Bart’s (α-thalassemia major)**, where all four alpha-globin genes are deleted (--/--). Since alpha chains are essential for the formation of both fetal hemoglobin (HbF, α2γ2) and adult hemoglobin (HbA, α2β2), their absence leads to the formation of gamma-chain tetramers (γ4), known as **Hb Bart’s**. * **Pathophysiology:** Hb Bart’s has an extremely high affinity for oxygen and does not release it to tissues, leading to severe intrauterine hypoxia, high-output cardiac failure, massive hepatosplenomegaly (due to extramedullary hematopoiesis), and ultimately, **Hydrops Fetalis**. **Why the Other Options are Incorrect:** * **Beta Thalassemia:** Symptoms do not appear at birth because newborns primarily have HbF (α2γ2). Beta-chain production only becomes significant around 6 months of age, which is when Beta Thalassemia Major typically manifests. * **Hereditary Spherocytosis:** While it can cause neonatal jaundice or anemia, it rarely causes hydrops fetalis or immediate neonatal death. * **Sickle Cell Anemia:** Similar to Beta Thalassemia, symptoms are delayed until HbF levels drop and beta-S chains increase (usually after 6 months). **High-Yield Clinical Pearls for NEET-PG:** * **Hb Bart’s:** γ4 tetramers (Alpha-thalassemia major, 4 gene deletion). * **HbH Disease:** β4 tetramers (3 gene deletion). * **Most common cause of non-immune hydrops** in Southeast Asia is Alpha Thalassemia. * **Diagnosis:** Confirmed by Hemoglobin electrophoresis showing Hb Bart’s.

Q: Which of the following statements about coagulation factor VII is not true?

Deficiency is associated with prolonged APTT. Factor VII (Proconvertin) is a vitamin K-dependent protease that plays a pivotal role in the Extrinsic Pathway of the coagulation cascade. 1. Why Option A is the Correct Answer (The False Statement): The Activated Partial Thromboplastin Time (APTT) measures the integrity of the Intrinsic and Common pathways (Factors XII, XI, IX, VIII, X, V, II, and I). Since Factor VII is uniquely part of the Extrinsic Pathway, its deficiency will result in a prolonged Prothrombin Time (PT) but a normal APTT [1]. Therefore, the statement that deficiency is associated with prolonged APTT is incorrect. 2. Analysis of Other Options: * Option B: Fresh Frozen Plasma (FFP) contains all coagulation factors, including Factor VII. It is a standard treatment for factor deficiencies when specific concentrates are unavailable. * Option C: Congenital Factor VII deficiency (Hypoconvertinemia) is a rare bleeding disorder inherited in an Autosomal Recessive pattern [2]. * Option D: Factor VII has the shortest half-life (approximately 4–6 hours) of all clotting factors. In contrast, Factor XII (Hageman factor) has a much longer half-life (approximately 48–52 hours). Clinical Pearls for NEET-PG: * Isolated PT prolongation with a normal APTT is the hallmark of Factor VII deficiency or early Vitamin K deficiency/Warfarin therapy (as Factor VII levels drop first) [1]. * Factor VII is the first factor to decrease in liver disease due to its short half-life, making PT a sensitive marker for acute liver protein synthesis. * Treatment: Recombinant activated Factor VII (rFVIIa) is the preferred treatment for severe bleeding or surgery in these patients.

Q: What is the characteristic translocation seen in mantle cell lymphoma?

t(11;14). **Explanation:** **Mantle Cell Lymphoma (MCL)** is a B-cell neoplasm characterized by the chromosomal translocation **t(11;14)(q13;q32)**. This translocation involves the fusion of the **CCND1 gene** (on chromosome 11) with the **IgH (Immunoglobulin Heavy chain) promoter** (on chromosome 14). This leads to the constitutive overexpression of **Cyclin D1**, a protein that promotes the transition of cells from the G1 to the S phase of the cell cycle, driving uncontrolled cellular proliferation. **Analysis of Incorrect Options:** * **A. t(8;14):** This is the hallmark of **Burkett Lymphoma**. It involves the translocation of the *c-MYC* proto-oncogene to the IgH locus, leading to rapid cell growth (starry-sky appearance). * **C. t(11;18):** This is associated with **MALT lymphoma** (Mucosa-Associated Lymphoid Tissue). It involves the fusion of *API2* and *MALT1* genes. * **D. t(9;22):** Known as the **Philadelphia Chromosome**, this is characteristic of **Chronic Myeloid Leukemia (CML)** and some cases of ALL. It creates the *BCR-ABL1* fusion protein with tyrosine kinase activity. **High-Yield Clinical Pearls for NEET-PG:** * **Immunophenotype:** MCL cells are typically **CD5+**, **CD20+**, and **Cyclin D1 positive**, but notably **CD23 negative** (helps differentiate it from CLL/SLL). * **Morphology:** Look for a "mantle" of small-to-medium-sized lymphocytes surrounding a germinal center [1]. * **Clinical Presentation:** Often presents in elderly males with lymphadenopathy and frequent involvement of the gastrointestinal tract (appearing as **lymphomatous polyposis**) [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 562-563.

Q: What is the shelf life of blood stored in CPDA buffer in a blood bank?

35 days. **Explanation:** The shelf life of stored blood is determined by the anticoagulant-preservative solution used, which maintains red cell viability and function by providing glucose for metabolism and preventing coagulation. **1. Why C is correct:** **CPDA-1 (Citrate Phosphate Dextrose Adenine)** is the most commonly used preservative in blood banks. The addition of **Adenine** is the key factor here; it acts as a substrate for ATP synthesis, which maintains the red cell membrane integrity and extends the shelf life to **35 days**. Without adenine (as in CPD), the shelf life is significantly shorter. **2. Why the other options are incorrect:** * **A (21 days):** This is the shelf life for older preservatives like **ACD (Acid Citrate Dextrose)** and **CPD (Citrate Phosphate Dextrose)**. These lack adenine, leading to faster ATP depletion. * **B (30 days):** This is not a standard shelf life for any conventional blood bag preservative. * **D (42 days):** This is the shelf life for blood stored with **Additive Solutions (SAGM - Saline, Adenine, Glucose, and Mannitol)**. In this system, the plasma is removed, and the additive solution is added to the packed red cells to extend viability. **3. High-Yield Clinical Pearls for NEET-PG:** * **Storage Temperature:** Whole blood and PRBCs must be stored at **2°C to 6°C**. * **The "Storage Lesion":** During storage, there is a decrease in 2,3-DPG (shifting the oxygen dissociation curve to the left), a decrease in pH, and an **increase in extracellular Potassium** (important in neonatal transfusions). * **Platelet Storage:** Unlike RBCs, platelets are stored at **20°C to 24°C** with constant agitation and have a shelf life of only **5 days**. * **FFP Storage:** Frozen at **-30°C or colder**, FFP has a shelf life of **1 year**.

Q: What is the current permissible maximum storage time and temperature for platelets?

5 days at 20-24°C. **Explanation** The correct answer is **B. 5 days at 20-24°C**. **1. Understanding the Concept** Platelets are unique compared to other blood components because they must be stored at **room temperature (20-24°C)** with **continuous agitation**. Agitation prevents platelet aggregation and maintains oxygen exchange, which is vital for preserving the "platelet storage lesion" (metabolic viability). If platelets are refrigerated (1-6°C), they undergo irreversible structural changes and are rapidly cleared by the liver upon transfusion, rendering them ineffective. The storage limit is capped at **5 days** primarily due to the high risk of bacterial proliferation at room temperature. **2. Analysis of Incorrect Options** * **Option A (1-6°C):** This is the storage temperature for Whole Blood and Packed Red Blood Cells (PRBCs). Cold temperatures cause platelet activation and dysfunction. * **Option C (7 days):** While some specialized bags or pathogen-reduction technologies (PRT) allow for 7-day storage in certain countries, the standard global and Indian (DGHS/NBTC) guideline remains 5 days to minimize sepsis risk. * **Option D (25-27°C):** This temperature is too high and exceeds the physiological range, accelerating bacterial growth and platelet degradation. **3. High-Yield Clinical Pearls for NEET-PG** * **Agitation:** Must be continuous (using a platelet agitator). * **Dose:** 1 unit of Random Donor Platelets (RDP) increases the count by **5,000–10,000/µL**; 1 unit of Single Donor Platelets (SDP) increases it by **30,000–60,000/µL**. * **Transfusion Trigger:** Usually <10,000/µL in stable patients or <50,000/µL if undergoing surgery. * **Complication:** Platelets have the **highest risk of bacterial contamination** among all blood products.

Q: What is the most common mutation found in hereditary elliptocytosis?

Spectrin. **Explanation:** Hereditary Elliptocytosis (HE) is an autosomal dominant red blood cell membrane disorder characterized by the presence of elliptical or cigar-shaped erythrocytes. The primary defect lies in the **horizontal interactions** of the cytoskeleton, which leads to mechanical instability of the RBC membrane. **Why Spectrin is correct:** The most common molecular defect in HE involves mutations in **α-spectrin** (specifically the SPTA1 gene), followed by β-spectrin. These mutations typically disrupt the formation of **spectrin dimers into tetramers**. When the spectrin scaffold cannot properly assemble or cross-link, the cell fails to recoil to its biconcave shape after passing through microcapillaries, resulting in permanent elliptical deformation. **Why other options are incorrect:** * **Ankyrin:** Mutations in Ankyrin are the most common cause of **Hereditary Spherocytosis (HS)**, affecting the *vertical* stability between the skeleton and the lipid bilayer [1]. * **Glycophorin A:** While Glycophorin C mutations can cause a rare subtype of HE (Leach phenotype), Glycophorin A is primarily a blood group antigen carrier and not the most common site for HE mutations. * **Band 4.2:** Deficiency of Protein 4.2 is a known but less common cause of Hereditary Spherocytosis [1], particularly prevalent in the Japanese population. **High-Yield Clinical Pearls for NEET-PG:** * **HE Hallmark:** Defect in **Horizontal interactions** (Spectrin tetramer assembly). * **HS Hallmark:** Defect in **Vertical interactions** (Ankyrin/Band 3/Spectrin binding to membrane) [1]. * **Blood Smear:** >25% elliptocytes is diagnostic for HE. * **Southeast Asian Ovalocytosis (SAO):** A specific subtype of HE caused by a mutation in **Band 3**, providing protection against malaria. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641.

Question 1

All of the following are true about anticoagulants except?

Accepted Answer

Sodium diphosphate helps in the synthesis of ATP

Answer

Maximum storage with CPDA-1 is 35 days

Answer

Maximum storage with SAGM is 42 days

Answer

Citrate prevents coagulation by chelating calcium

Question 2

A child died soon after birth. On examination, there was hepatosplenomegaly and edema all over the body. What is the most probable diagnosis?

Accepted Answer

Alpha Thalassemia

Answer

Beta Thalassemia

Answer

Hereditary spherocytosis

Answer

Sickle cell anemia

Question 3

Which of the following CD markers is NOT used for diagnostic criteria for systemic mastocytosis?

Accepted Answer

CD 20

Answer

CD 2

Answer

CD 25

Answer

CD 117

Question 4

Which of the following statements about coagulation factor VII is not true?

Accepted Answer

Deficiency is associated with prolonged APTT

Answer

Deficiency can be managed by Fresh Frozen Plasma

Answer

Deficiency is inherited as an Autosomal Recessive trait

Answer

Has a short half-life in comparison to Hageman factor (XII)

Question 5

What is the characteristic translocation seen in mantle cell lymphoma?

Accepted Answer

t(11;14)

Answer

t(8;14)

Answer

t(11;18)

Answer

t(9;22)

Question 6

Which of the following is NOT a feature of multiple myeloma?

Accepted Answer

Elevated alkaline phosphatase

Answer

Hypercalcemia

Answer

Anemia

Answer

Hyperviscosity

Question 7

What is the shelf life of blood stored in CPDA buffer in a blood bank?

Accepted Answer

35 days

Answer

21 days

Answer

30 days

Answer

42 days

Question 8

What is the current permissible maximum storage time and temperature for platelets?

Accepted Answer

5 days at 20-24°C

Answer

5 days at 1-6°C

Answer

7 days at 22-24°C

Answer

5 days at 25-27°C

Question 9

Cytogenetic studies in a 70-year-old woman with chronic myelogenous leukemia (CML) demonstrate a t(9;22) chromosomal translocation. Which of the following best explains the role of this translocation in the pathogenesis of leukemia in this patient?

Accepted Answer

Protooncogene activation

Answer

Altered DNA methylation status

Answer

Enhanced expression of telomerase gene

Answer

Expansion of a trinucleotide repeat

Question 10

What is the most common mutation found in hereditary elliptocytosis?

Accepted Answer

Spectrin

Answer

Ankyrin

Answer

Glycophorin A

Answer

Band 4.2

Hematopathology — MCQs

Hematopathology — MCQs

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