Hematology Practice Questions

Q: A 30-year-old female presents with an RBC count of 4.5 million/µL, MCV of 55 fL, and TLC of 8000/µL. She has no history of blood transfusion. What is the most likely diagnosis?

Thalassemia minor. ### Explanation The key to solving this clinical scenario lies in the **Mentzer Index**, which is a high-yield tool for differentiating microcytic anemias. **1. Why Thalassemia Minor is Correct:** The Mentzer Index is calculated as **MCV / RBC count**. * In this patient: $55 / 4.5 = 12.2$. * A Mentzer Index **< 13** strongly suggests **Thalassemia trait/minor**. * In Thalassemia, the bone marrow is hyperactive but produces defective hemoglobin, leading to a high or near-normal RBC count despite a very low MCV (disproportionate microcytosis). A patient with an MCV as low as 55 fL who is otherwise stable and has a normal RBC count is classic for Thalassemia minor. **2. Why the other options are incorrect:** * **Iron Deficiency Anemia (IDA):** The Mentzer Index is typically **> 13**. In IDA, the RBC count decreases because the "building blocks" (iron) are missing [1]. An MCV of 55 fL in IDA would usually be accompanied by a much lower RBC count. * **Thalassemia Major:** This presents in early childhood with severe anemia, hepatosplenomegaly, and skeletal deformities. Patients are transfusion-dependent; this patient is 30 years old with no transfusion history. * **Megaloblastic Anemia:** This is a **macrocytic** anemia characterized by an MCV > 100 fL [1]. The patient’s MCV of 55 fL (microcytic) immediately rules this out. **Clinical Pearls for NEET-PG:** * **Mentzer Index:** $ 13$ = Iron Deficiency. * **Red Cell Distribution Width (RDW):** Usually normal in Thalassemia minor but elevated in IDA. * **Confirmatory Test:** Hb Electrophoresis is the gold standard for Thalassemia (showing elevated HbA2 > 3.5%). * **Target Cells:** Commonly seen on the peripheral smear of Thalassemia patients.

Q: A 30-year-old male presented with a skin lesion in his right axilla. A presumptive diagnosis of staphylococcal skin carbuncle was made and the patient was treated with empiric trimethoprim/sulfamethoxazole. After 2 days, the patient presented to the emergency department with excessive weakness, abdominal pain, and dark-colored urine. On examination, vital signs were normal, and jaundice was present. Laboratory studies showed a drop in Hb from 14 g/dl to 8 g/dl and a rise in bilirubin levels. Urine dipstick was positive for bilirubin. Peripheral blood smear findings are suggestive of a specific condition. What is the most likely diagnosis for this patient?

Glucose-6-phosphate dehydrogenase (G6PD) deficiency. ***Glucose-6-phosphate dehydrogenase (G6PD) deficiency*** - **Trimethoprim/sulfamethoxazole** is a known trigger for **oxidative hemolysis** in G6PD deficiency, causing rapid drop in Hb from 14 to 8 g/dl with **dark urine** and **jaundice**. - Peripheral blood smear would show **bite cells** and **Heinz bodies**, characteristic findings of oxidative hemolytic anemia in G6PD deficiency. *Hemolytic-uremic syndrome* - Typically presents with the **triad** of **hemolytic anemia**, **thrombocytopenia**, and **acute kidney injury**, often following **diarrheal illness**. - Associated with **schistocytes** on peripheral smear and **elevated creatinine**, which are not described in this case. *Hereditary spherocytosis* - Characterized by **chronic hemolysis** with **spherocytes** on peripheral smear and **osmotic fragility test** positivity. - Usually presents with **splenomegaly** and **gallstones** from chronic hemolysis, not acute drug-induced hemolysis. *Iron deficiency anemia* - Develops **gradually** over months with **microcytic hypochromic** red blood cells and **low ferritin** levels. - Does not cause **acute hemolysis**, **dark urine**, or **jaundice** as seen in this patient.

Q: A patient presents with macroglossia and decreased hemoglobin. Laboratory investigations reveal low vitamin B12 levels and low folic acid levels. What is the most likely diagnosis?

Megaloblastic anemia. ### Explanation **1. Why Megaloblastic Anemia is Correct:** Megaloblastic anemia is characterized by impaired DNA synthesis, most commonly due to a deficiency in **Vitamin B12 (Cobalamin)** and/or **Folic acid**. These vitamins are essential cofactors for nucleic acid synthesis; their deficiency leads to "nuclear-cytoplasmic asynchrony," where the nucleus matures slower than the cytoplasm [1]. * **Clinical Correlation:** **Macroglossia** (beefy red, smooth tongue) is a classic physical finding in megaloblastic anemia due to the atrophy of lingual papillae. * **Laboratory Correlation:** The combination of low hemoglobin (anemia) and low levels of B12/Folate confirms the diagnosis [1]. **2. Why Other Options are Incorrect:** * **Hemolytic Anemia:** Characterized by increased red cell destruction. While it can cause jaundice and splenomegaly, it does not typically present with macroglossia or low B12/Folate levels. * **Sideroblastic Anemia:** This is a microcytic anemia (usually) caused by defective heme synthesis. It is characterized by "ringed sideroblasts" in the bone marrow and iron overload, not B12/Folate deficiency. * **Anemia of Chronic Disease (ACD):** Usually normocytic or mildly microcytic. It is driven by high **Hepcidin** levels due to inflammation, leading to iron sequestration, not vitamin deficiencies [1]. **3. NEET-PG High-Yield Pearls:** * **Peripheral Smear:** Look for **Hypersegmented Neutrophils** (earliest sign) and **Oval Macrocytes**. * **MCV:** Typically >100 fL. * **Neurological Symptoms:** Only seen in Vitamin B12 deficiency (Subacute Combined Degeneration of the spinal cord), NOT in Folate deficiency [1]. * **Biochemical Markers:** Both B12 and Folate deficiency show elevated **Homocysteine**; however, only B12 deficiency shows elevated **Methylmalonic Acid (MMA)**. * **Commonest Cause:** In India, nutritional deficiency is the most common cause of megaloblastic anemia.

Q: What is the most appropriate drug used in the management of iron chelation in beta-thalassemia major?

Oral deferiprone. **Explanation:** In patients with **Beta-thalassemia major**, chronic blood transfusions lead to secondary iron overload (hemosiderosis). Since the human body lacks an active mechanism to excrete excess iron, chelation therapy is mandatory to prevent organ damage, particularly to the heart and liver. **Why Oral Deferiprone is correct:** **Deferiprone** is an orally active iron chelator. It is particularly noted for its ability to cross cell membranes effectively and remove iron from intracellular sites. In clinical practice, it is highly effective at removing **cardiac iron**, making it a preferred choice for preventing or treating iron-induced cardiomyopathy, the leading cause of death in these patients. **Analysis of Incorrect Options:** * **A. Oral Desferrioxamine:** Desferrioxamine is a potent chelator, but it is **not absorbed orally**. It must be administered via slow subcutaneous or intravenous infusion (usually 8–12 hours daily), which leads to poor patient compliance. * **C. Intramuscular EDTA:** Calcium disodium EDTA is primarily used for **lead poisoning**, not for chronic iron overload in thalassemia. * **D. Oral Succimer:** Succimer (DMSA) is an oral chelating agent used for **lead, mercury, and arsenic poisoning** in children. It has no role in iron chelation. **NEET-PG High-Yield Pearls:** 1. **Deferasirox:** Another common oral chelator; it is often the first-line choice for systemic iron overload due to its once-daily dosing. 2. **Side Effects:** * **Deferiprone:** Agranulocytosis (requires weekly CBC monitoring) and arthralgia. * **Desferrioxamine:** Ototoxicity and retinal damage. 3. **Indication for Chelation:** Usually started when Serum Ferritin >1000 ng/ml or after 10–20 transfusions.

Q: Classical "Rain drop" lesions are seen in which of the following conditions?

Multiple myeloma. **Explanation:** **Multiple Myeloma (Option C)** is the correct answer. The "Rain drop" appearance (also known as "punched-out" lesions) refers to multiple, small, well-circumscribed radiolucent areas seen on a skull X-ray [1]. These lesions occur because malignant plasma cells in the bone marrow secrete **Osteoclast Activating Factors** (such as IL-6 and RANK-L), which stimulate osteoclasts to resorb bone while inhibiting osteoblastic activity [1]. This leads to purely lytic bone destruction without any surrounding reactive sclerosis. **Why other options are incorrect:** * **Burkitt’s Lymphoma (Option A):** Characterized histologically by a "Starry sky" appearance (macrophages among neoplastic B-cells) and radiologically by jaw involvement, but not rain-drop skull lesions. * **Hodgkin’s Lymphoma (Option B):** Typically presents with lymphadenopathy and Reed-Sternberg cells. Bone involvement is less common and often osteoblastic (sclerotic), such as the "Ivory vertebra." * **Haemophilia (Option D):** Primarily a bleeding disorder. Chronic joint bleeds lead to "Haemophilic arthropathy" and "Pseudotumors" (subperiosteal hemorrhage), not diffuse lytic skull lesions. **NEET-PG High-Yield Pearls:** * **Skeletal Survey:** In Multiple Myeloma, a plain X-ray is superior to a Bone Scan (Technetium-99m), as bone scans require osteoblastic activity to show "hot spots," which is absent in myeloma. * **CRAB Criteria:** Calcium (high), Renal failure, Anemia, and Bone lesions. * **M-Spike:** Found on Serum Protein Electrophoresis (usually IgG). * **Bence-Jones Proteins:** Free light chains found in urine that precipitate at 40-60°C and redissolve at 100°C.

Q: Which of the following is true regarding lymph node enlargement in Hodgkin's Lymphoma?

Painless. In Hodgkin’s Lymphoma (HL), the classic presentation is a young adult with asymptomatic lymphadenopathy. ### **Explanation of the Correct Answer** **Option B (Painless)** is correct because the lymph node enlargement in HL is typically due to the slow, clonal expansion of B-cells (Reed-Sternberg cells) and an associated inflammatory infiltrate. Unlike infections, where rapid expansion causes stretching of the lymph node capsule and subsequent pain, the growth in lymphoma is gradual and does not trigger an acute inflammatory pain response. ### **Analysis of Incorrect Options** * **Option A (Matted):** Matted lymph nodes (nodes that feel fused together) are characteristic of **Tuberculosis (TB)** or metastatic carcinoma. In HL, nodes are typically discrete, rubbery, and firm. * **Option C (Non-progressive):** Lymphomatous nodes are **progressive**. They continue to enlarge over time and may eventually involve adjacent node groups in a predictable, contiguous fashion. * **Option D (Tender):** Tenderness is a hallmark of **lymphadenitis** (acute infection). Malignant nodes are characteristically non-tender. ### **High-Yield Clinical Pearls for NEET-PG** * **Alcohol-Induced Pain:** A unique, pathognomonic feature of HL is the onset of **pain in the lymph nodes immediately after alcohol consumption** (seen in 10% in 6 months) are critical for staging and prognosis.

Q: Which antibody is commonly elevated in Waldenstrom macroglobulinemia?

IgM. **Explanation:** **Waldenström Macroglobulinemia (WM)** is a low-grade B-cell lymphoma characterized by the infiltration of the bone marrow by **lymphoplasmacytic cells** that secrete a monoclonal **IgM** protein [1]. 1. **Why IgM is Correct:** The defining feature of WM is the presence of a monoclonal IgM paraprotein (M-spike) in the serum [1]. Because IgM is the largest immunoglobulin (a pentamer), its elevation significantly increases blood viscosity, leading to the classic **Hyperviscosity Syndrome** (headache, visual disturbances, and mucosal bleeding) [1]. 2. **Why Other Options are Incorrect:** * **IgG and IgA:** These are typically elevated in **Multiple Myeloma (MM)**. While MM involves plasma cells, WM involves lymphoplasmacytoid cells. IgG is the most common subtype in MM, followed by IgA. * **IgD:** This is a very rare subtype of Multiple Myeloma and is not associated with Waldenström Macroglobulinemia. **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Marker:** Over 90% of patients with WM harbor the **MYD88 L265P mutation**, which is a crucial diagnostic marker. * **Clinical Triad:** Anemia, hepatosplenomegaly/lymphadenopathy (unlike Multiple Myeloma), and hyperviscosity symptoms [1]. * **Diagnosis:** Bone marrow biopsy showing >10% infiltration by lymphoplasmacytic cells + IgM monoclonal protein (any size). * **Fundoscopy:** May show "sausage-link" or "box-car" appearance of retinal veins due to hyperviscosity. * **Treatment:** Plasmapheresis is the immediate treatment for symptomatic hyperviscosity; Rituximab-based regimens are used for definitive therapy [1].

Question 1

A 30-year-old female presents with an RBC count of 4.5 million/µL, MCV of 55 fL, and TLC of 8000/µL. She has no history of blood transfusion. What is the most likely diagnosis?

Accepted Answer

Thalassemia minor

Answer

Iron deficiency anemia

Answer

Thalassemia major

Answer

Megaloblastic anemia

Question 2

A 30-year-old male presented with a skin lesion in his right axilla. A presumptive diagnosis of staphylococcal skin carbuncle was made and the patient was treated with empiric trimethoprim/sulfamethoxazole. After 2 days, the patient presented to the emergency department with excessive weakness, abdominal pain, and dark-colored urine. On examination, vital signs were normal, and jaundice was present. Laboratory studies showed a drop in Hb from 14 g/dl to 8 g/dl and a rise in bilirubin levels. Urine dipstick was positive for bilirubin. Peripheral blood smear findings are suggestive of a specific condition. What is the most likely diagnosis for this patient?

Accepted Answer

Glucose-6-phosphate dehydrogenase (G6PD) deficiency

Answer

Hemolytic-uremic syndrome

Answer

Hereditary spherocytosis

Answer

Iron deficiency anemia

Question 3

A patient presents with macroglossia and decreased hemoglobin. Laboratory investigations reveal low vitamin B12 levels and low folic acid levels. What is the most likely diagnosis?

Accepted Answer

Megaloblastic anemia

Answer

Hemolytic anemia

Answer

Sideroblastic anemia

Answer

Anemia of chronic disease

Question 4

What is the most appropriate drug used in the management of iron chelation in beta-thalassemia major?

Accepted Answer

Oral deferiprone

Answer

Oral desferrioxamine

Answer

Intramuscular EDTA

Answer

Oral succimer

Question 5

A crisis in a patient with sickle cell disease is most likely to be caused by which of the following conditions?

Accepted Answer

Acidosis

Answer

Alkalosis

Answer

Increased oxygen concentration

Answer

Decreased CO2 concentration

Question 6

Classical "Rain drop" lesions are seen in which of the following conditions?

Accepted Answer

Multiple myeloma

Answer

Burkitt's lymphoma

Answer

Hodgkin's lymphoma

Answer

Haemophilia

Question 7

Which of the following is true regarding lymph node enlargement in Hodgkin's Lymphoma?

Accepted Answer

Painless

Answer

Matted lymph nodes

Answer

Non-progressive

Answer

Tender

Question 8

Which of the following statements is false regarding Multiple Myeloma?

Accepted Answer

It is a plasma cell malignancy characterized by the overproduction of a monoclonal immunoglobulin.

Answer

Bence Jones proteins are typically found in the urine.

Answer

Lytic bone lesions are a common radiological finding.

Answer

Rouleaux formation of red blood cells may be observed on peripheral blood smear.

Question 9

Leukocytosis is seen in all conditions except?

Accepted Answer

Typhoid Fever

Answer

Brucellosis

Answer

Acute Myocardial Infarction

Answer

Diphtheria

Question 10

Which antibody is commonly elevated in Waldenstrom macroglobulinemia?

Accepted Answer

IgM

Answer

IgG

Answer

IgA

Answer

IgD

Hematology — MCQs

Hematology — MCQs

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