Hematopathology Practice Questions

Q: Platelets are stored at what temperature?

20-24°C. **Explanation:** **Correct Answer: A. 20-24°C** Platelets are stored at **room temperature (20-24°C)** under continuous agitation. This specific temperature range is critical to maintain platelet viability and metabolic activity. Agitation (using a platelet agitator) is necessary to prevent aggregation and to facilitate gas exchange ($O_2$ and $CO_2$), which prevents a drop in pH that would otherwise lead to the loss of platelet function (the "storage lesion"). **Analysis of Incorrect Options:** * **B. 2-6°C:** This is the storage temperature for **Whole Blood and Packed Red Blood Cells (PRBCs)**. Refrigerating platelets at this temperature causes irreversible structural changes (cold-induced activation and "chilling injury"), leading to rapid clearance from the recipient's circulation by hepatic macrophages. * **C. 37°C:** This is normal body temperature. Storing blood components at this temperature would promote rapid bacterial proliferation and protein denaturation. * **D. -2 to -4°C:** This is below the freezing point for blood components. Freezing without specialized cryoprotectants (like glycerol) causes ice crystal formation, which ruptures cell membranes. (Note: Fresh Frozen Plasma is stored at **-18°C or colder**). **High-Yield Clinical Pearls for NEET-PG:** * **Shelf Life:** Platelets have the shortest shelf life of all blood components—only **5 days**—due to the risk of bacterial contamination at room temperature. * **Transfusion Dose:** One unit of Random Donor Platelets (RDP) typically increases the platelet count by **5,000–10,000/µL** in an average adult. * **Apheresis:** Single Donor Platelets (SDP) are equivalent to 6–8 units of RDP. * **Best Indicator of Viability:** The "swirling phenomenon" observed when a platelet bag is held against light indicates healthy, discoid platelets.

Q: Transient myeloproliferative disorder of the newborn is seen in association with which of the following genetic conditions?

Down syndrome. **Explanation:** **Transient Myeloproliferative Disorder (TMD)**, also known as Transient Abnormal Myelopoiesis (TAM), is a unique hematologic condition characterized by the clonal proliferation of megakaryoblasts. It occurs almost exclusively in neonates with **Down syndrome (Trisomy 21)**. **Why Down Syndrome is Correct:** The pathogenesis involves a synergistic relationship between the extra copy of chromosome 21 and an acquired somatic mutation in the **GATA1 gene**. This mutation leads to the production of a truncated protein (GATA1s), which triggers uncontrolled proliferation of immature megakaryocytes in the fetal liver and bone marrow. While TMD usually resolves spontaneously within the first 3 months of life, approximately 20-30% of these children later develop **Acute Megakaryoblastic Leukemia (AMKL/M7)**. **Why Other Options are Incorrect:** * **Turner Syndrome (45, XO):** Associated with coarctation of the aorta and horseshoe kidney, but not specifically with TMD or neonatal leukemia. * **Neurofibromatosis (NF1):** While NF1 increases the risk of Juvenile Myelomonocytic Leukemia (JMML), it is not associated with TMD. * **Ataxia Telangiectasia:** This is a DNA repair defect (ATM gene) that predisposes patients to lymphomas and lymphocytic leukemias later in childhood, not neonatal TMD. **High-Yield Clinical Pearls for NEET-PG:** * **Gene Mutation:** GATA1 (Shortened/truncated version). * **Clinical Presentation:** Hepatosplenomegaly, jaundice, and high peripheral blast count in a neonate with Down syndrome features. * **Prognosis:** Most cases regress spontaneously; however, survivors must be monitored for the development of **AMKL (AML-M7)**. * **Treatment:** Usually observation; low-dose Cytarabine is reserved only for life-threatening organ dysfunction.

Q: Burr cells are seen in which condition?

Uremia. **Burr cells**, also known as **Echinocytes**, are mature red blood cells characterized by multiple, short, blunt, and evenly spaced circumferential projections. **1. Why Uremia is correct:** In **Uremia** (chronic kidney disease), the accumulation of metabolic waste products and toxins in the plasma alters the osmotic environment and the lipid composition of the RBC membrane [1]. This leads to an expansion of the outer leaflet of the lipid bilayer relative to the inner leaflet, resulting in the characteristic "spiculated" appearance. Burr cells are a classic peripheral smear finding in renal failure and are reversible if the cells are placed in healthy serum [2]. **2. Why the other options are incorrect:** * **Gastric Carcinoma:** While not the primary association, gastric carcinoma is classically associated with **Acanthocytes** (Spur cells) or microangiopathic hemolytic anemia (MAHA) if disseminated, but not specifically Burr cells. * **Hepatocellular & Ovarian Carcinoma:** These do not typically present with Burr cells. Liver disease is more commonly associated with **Target cells** (Codocytes) or **Acanthocytes** (due to abnormal cholesterol metabolism). **3. High-Yield Clinical Pearls for NEET-PG:** * **Burr Cells vs. Acanthocytes:** Burr cells have *regular, even* projections; Acanthocytes have *irregular, finger-like* projections. * **Common Causes of Burr Cells:** Uremia (most common), Pyruvate Kinase deficiency, and Hypophosphatemia. * **Acanthocytes (Spur Cells)** are seen in Abetalipoproteinemia and severe Liver Disease. * **Schistocytes** (Fragmented cells) are seen in MAHA (DIC, HUS, TTP). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 902-905. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 539-540.

Q: Which of the following statements about acute hemolytic blood transfusion reactions is true?

Complement mediated hemolysis is seen.. **Explanation:** **Acute Hemolytic Transfusion Reaction (AHTR)** is a medical emergency typically caused by **ABO incompatibility** [2]. 1. **Why Option A is correct:** AHTR is a classic example of **Type II Hypersensitivity**. When incompatible blood is transfused, pre-existing host IgM antibodies (isohemagglutinins) bind to donor red cell antigens. This triggers the **classical complement pathway**, leading to the formation of the Membrane Attack Complex (MAC) [2]. This results in rapid **intravascular hemolysis**, releasing free hemoglobin into the plasma [1]. 2. **Why other options are incorrect:** * **Option B:** AHTR is a **Type II hypersensitivity** (antibody-mediated cytotoxicity), not Type III (immune-complex mediated). * **Option C:** These reactions are **highly life-threatening**. They can rapidly progress to disseminated intravascular coagulation (DIC), shock, and multi-organ failure [2]. * **Option D:** Renal blood flow is **severely compromised**. Free hemoglobin is nephrotoxic and can cause **Acute Tubular Necrosis (ATN)** [1]. Furthermore, systemic hypotension and DIC-induced microthrombi lead to acute renal failure. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Clerical/Administrative error (wrong blood to wrong patient) [2]. * **Triad of symptoms:** Fever/Chills, Flank pain (due to renal ischemia), and Hemoglobinuria [1]. * **Lab Findings:** Positive Direct Antiglobulin Test (DAT/Coombs), decreased haptoglobin, and increased indirect bilirubin [1]. * **Management:** Immediate cessation of transfusion and aggressive IV fluid resuscitation to maintain urine output. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 639-640. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 673-674.

Q: Which of the following is the most common cause of transfusion-associated hepatitis?

Hepatitis B. The correct answer is **Hepatitis B (HBV)**. While Hepatitis C was historically the most common cause of post-transfusion hepatitis before the discovery of the virus and the implementation of rigorous screening, modern nucleic acid testing (NAT) has significantly reduced the risk for both HBV and HCV. However, **Hepatitis B remains the most common** transfusion-transmitted viral infection (TTI) globally and in India. This is primarily due to the "occult" HBV infection (HBsAg negative but DNA positive) and the longer window period compared to other viruses, which allows it to occasionally bypass standard screening protocols. **Analysis of Incorrect Options:** * **Hepatitis A:** It is primarily transmitted via the fecal-oral route [1]. While transient viremia occurs, it is an extremely rare cause of transfusion-associated hepatitis because it does not have a chronic carrier state. * **Hepatitis C:** Formerly the leading cause of "Non-A, Non-B" post-transfusion hepatitis. Since the introduction of highly sensitive NAT, the risk has plummeted to less than 1 in 2 million units in developed regions, making it less common than HBV. * **Hepatitis D:** This is a defective virus that requires the presence of HBsAg to replicate. It is only transmitted alongside HBV and is not considered an independent primary cause of transfusion-associated hepatitis. **High-Yield Pearls for NEET-PG:** * **Most common TTI overall:** Hepatitis B. * **Most common cause of post-transfusion purpura:** Antibodies against HPA-1a. * **Most common cause of transfusion-related mortality:** TRALI (Transfusion-Related Acute Lung Injury). * **Window Period:** HBV has a longer window period (~30-60 days) compared to HIV (~7-10 days) or HCV (~3-5 days) when using NAT. [2]

Question 1

CD-10 is seen in which of the following conditions?

Accepted Answer

Acute Lymphoblastic Leukemia (ALL)

Answer

Chronic Lymphocytic Leukemia (CLL)

Answer

Hairy Cell Leukemia (HCL)

Answer

Chronic Myeloid Leukemia (CML)

Question 2

Platelets are stored at what temperature?

Accepted Answer

20-24°C

Answer

2-6°C

Answer

37°C

Answer

-2 to -4°C

Question 3

A one-year-old boy presented with hepatosplenomegaly and delayed milestones. Liver biopsy and bone marrow biopsy revealed histiocytes with PAS-positive material. Electron microscopic examination of these histiocytes is most likely to reveal what?

Accepted Answer

Birbeck granules in the cytoplasm

Answer

Myelin figures in the cytoplasm

Answer

Parallel arrays of tubular structures in lysosomes

Answer

Electron dense deposits in the mitochondria

Question 4

Transient myeloproliferative disorder of the newborn is seen in association with which of the following genetic conditions?

Accepted Answer

Down syndrome

Answer

Turner syndrome

Answer

Neurofibromatosis

Answer

Ataxia telangiectasia

Question 5

Translocation of the bcr-abl gene is characteristically seen in which of the following conditions?

Accepted Answer

Chronic myeloid leukemia

Answer

Acute myeloid leukemia

Answer

Chronic lymphatic leukemia

Answer

Acute lymphatic leukemia

Question 6

Burr cells are seen in which condition?

Accepted Answer

Uremia

Answer

Hepatocellular carcinoma

Answer

Gastric carcinoma

Answer

Ovarian carcinoma

Question 7

Which of the following statements about acute hemolytic blood transfusion reactions is true?

Accepted Answer

Complement mediated hemolysis is seen.

Answer

Type III hypersensitivity is responsible for most cases.

Answer

These reactions are rarely life-threatening.

Answer

Renal blood flow is always maintained.

Question 8

Gandy Gamma bodies are seen in which of the following conditions?

Accepted Answer

Sickle cell anemia

Answer

Thalassemia

Answer

Hereditary spherocytosis

Answer

Vitamin B12 deficiency

Question 9

Disseminated intravascular coagulation (DIC) is commonly seen in which of the following conditions?

Accepted Answer

Acute promyelocytic leukemia

Answer

Acute myelomonocytic leukemia

Answer

Chronic myeloid leukemia

Answer

Autoimmune hemolytic anemia

Question 10

Which of the following is the most common cause of transfusion-associated hepatitis?

Accepted Answer

Hepatitis B

Answer

Hepatitis A

Answer

Hepatitis C

Answer

Hepatitis D

Hematopathology — MCQs

Hematopathology — MCQs

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