Hematology Practice Questions

Q: Which of the following is NOT included in the differential diagnosis of microangiopathic hemolytic anemia?

Myocardial infarction. **Explanation:** Microangiopathic Hemolytic Anemia (MAHA) is a descriptive term for non-immune hemolytic anemias characterized by **fragmentation of red blood cells (schistocytes)** [1]. This occurs due to mechanical shearing of erythrocytes as they pass through small blood vessels obstructed by fibrin or platelet thrombi [1]. **Why Myocardial Infarction (MI) is the correct answer:** MI is a macrovascular event typically caused by the occlusion of a coronary artery by an atherosclerotic plaque or thrombus. It does not involve systemic microvascular pathology or the mechanical shearing of RBCs. Therefore, it is not a cause of MAHA. **Analysis of Incorrect Options:** * **Sepsis:** Severe sepsis can trigger **Disseminated Intravascular Coagulation (DIC)** [2]. In DIC, widespread fibrin deposition in the microvasculature leads to RBC fragmentation and schistocyte formation [1]. * **Hemolytic Uremic Syndrome (HUS):** This is a classic cause of MAHA, characterized by the triad of microangiopathic anemia, thrombocytopenia, and acute renal failure, typically due to Shiga toxin-induced endothelial damage [1]. * **Eclampsia:** Preeclampsia and eclampsia can lead to **HELLP syndrome** (Hemolysis, Elevated Liver enzymes, Low Platelets), which is a specific form of MAHA occurring in pregnancy [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Finding:** The presence of **schistocytes** (helmet cells) on a peripheral blood smear (>1% is significant). * **Laboratory Markers:** Elevated LDH, decreased haptoglobin, and indirect hyperbilirubinemia (all markers of hemolysis), with a **negative Direct Coombs Test** (confirming non-immune etiology). * **Primary Differential (The "Pentad" of TTP):** Fever, Anemia (MAHA), Thrombocytopenia, Neurological symptoms, and Renal failure. * **Other Causes:** Malignant hypertension, Systemic Sclerosis (Scleroderma renal crisis), and prosthetic heart valves (Macroangiopathic) [1].

Q: A 33-year-old alcoholic patient on anti-tuberculosis treatment presents with increased serum iron and increased transferrin saturation. What is the most likely diagnosis?

Sideroblastic anemia. ### Explanation **Correct Answer: B. Sideroblastic Anemia** The clinical presentation points toward **Sideroblastic Anemia**, a defect in heme synthesis. In this condition, iron is available but cannot be incorporated into protoporphyrin to form heme. This leads to iron overload in the mitochondria of erythroid precursors, forming "ringed sideroblasts." * **Underlying Mechanism:** The patient has two major risk factors: **Alcoholism** (a common cause of acquired sideroblastic anemia) and **Anti-Tuberculosis Treatment (Isoniazid)**. Isoniazid is a Vitamin B6 (Pyridoxine) antagonist. Since B6 is a mandatory cofactor for **ALA synthase** (the rate-limiting enzyme in heme synthesis), its deficiency leads to impaired heme production and subsequent iron accumulation. * **Iron Profile:** Because iron is not being utilized, serum iron increases, and transferrin saturation rises, reflecting systemic iron overload. **Why other options are incorrect:** * **A. Iron Deficiency Anemia:** Characterized by *decreased* serum iron and *decreased* transferrin saturation (opposite of this case). * **C. Megaloblastic Anemia:** While common in alcoholics (Folate deficiency), it typically presents with normal or slightly elevated iron; however, it does not explain the specific association with INH or the classic iron-overload profile seen here. * **D. Anemia of Chronic Disease:** Characterized by *decreased* serum iron and *decreased* TIBC due to iron sequestration in macrophages (hepcidin-mediated). **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Bone marrow examination showing **Ringed Sideroblasts** (Prussian Blue stain). * **Management:** Discontinue the offending agent (Alcohol/INH) and supplement with **Pyridoxine (Vitamin B6)**. * **Lead Poisoning:** Another cause of sideroblastic anemia; look for "basophilic stippling" and "Burtonian lines" on gums.

Q: Which of the following is the least common presentation of multiple myeloma?

Hyperviscocity. **Explanation:** Multiple Myeloma (MM) is a neoplastic proliferation of plasma cells characterized by the "CRAB" features (Calcium elevation, Renal failure, Anemia, and Bone lesions). **Why Hyperviscosity is the correct answer:** While Multiple Myeloma involves the overproduction of monoclonal immunoglobulins (M-protein), **Hyperviscosity Syndrome** is relatively rare, occurring in only about **2–6%** of patients. It is much more characteristic of **Waldenström Macroglobulinemia**, where the large size of IgM pentamers significantly increases blood viscosity. In MM, hyperviscosity usually only occurs if the M-protein concentration is extremely high (typically IgA or IgG3 subtypes). **Analysis of Incorrect Options:** * **Anemia (Option A):** This is the most common hematological finding (present in ~73% of cases) due to bone marrow infiltration by plasma cells and cytokine-mediated suppression of erythropoiesis. * **Bone Pains (Option C):** This is the most common presenting symptom (~58-70%). Plasma cells produce Osteoclast Activating Factors (OAFs) like IL-6 and RANK-L, leading to lytic "punched-out" lesions and pathological fractures. * **Infection (Option D):** This is a leading cause of morbidity and mortality. Patients have functional hypogammaglobulinemia (decreased normal antibodies), making them highly susceptible to encapsulated organisms like *S. pneumoniae*. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death:** Infection (Sepsis) followed by Renal Failure. * **Radiology:** "Punched-out" lytic lesions; **Bone scans are often negative** because they detect osteoblastic activity, which is absent in MM. * **Blood Film:** **Rouleaux formation** (due to decreased zeta potential between RBCs by paraproteins). * **Urinalysis:** Bence-Jones proteins (free light chains) are detected by heat precipitation test, **not** by standard dipsticks.

Q: Which of the following conditions is typically associated with a normal platelet count?

Shaken baby syndrome. **Explanation:** The correct answer is **Shaken baby syndrome (B)**. This condition is characterized by the clinical triad of subdural hemorrhage, retinal hemorrhage, and encephalopathy. Unlike the other options, it is a mechanical injury caused by physical abuse (acceleration-deceleration forces), which does not inherently involve a consumption or sequestration of platelets. Therefore, the platelet count remains **normal**. **Analysis of Incorrect Options:** * **Disseminated Intravascular Coagulation (DIC):** This is a consumptive coagulopathy. Widespread activation of the coagulation cascade leads to the formation of microthrombi, which consumes platelets and clotting factors, resulting in **thrombocytopenia**. * **Microangiopathic Hemolytic Anemia (MAHA):** Conditions like TTP or HUS involve the formation of platelet-rich thrombi in small vessels. These thrombi mechanically shear RBCs (schistocytes) and consume platelets, leading to **thrombocytopenia**. * **Splenomegaly:** The spleen normally stores about one-third of the body's platelets. In splenomegaly (congestive or infiltrative), the spleen sequesters a significantly higher percentage of platelets, leading to **sequestration-induced thrombocytopenia**. **NEET-PG High-Yield Pearls:** * **Shaken Baby Syndrome:** Always look for the "triad" in forensic/pediatric questions. A normal coagulation profile and platelet count help rule out bleeding diathesis as a cause of the intracranial bleed. * **Pseudothrombocytopenia:** Always remember that EDTA-induced platelet clumping can cause a falsely low count on automated analyzers; check a peripheral smear. * **Isolated Thrombocytopenia:** In a patient with a low platelet count but otherwise normal CBC and no organomegaly, **ITP (Immune Thrombocytopenic Purpura)** is the most likely diagnosis.

Q: Thrombotic thrombocytopenic purpura involves which of the following phenomena, except?

High complement level. Thrombotic Thrombocytopenic Purpura (TTP) is a life-threatening hematological emergency caused by a deficiency of the metalloproteinase **ADAMTS13**. This deficiency leads to the persistence of ultra-large von Willebrand factor (vWF) multimers, which cause spontaneous platelet aggregation and microthrombi formation. **Why Option C is the correct answer:** TTP is primarily a disorder of platelet aggregation and is **not** mediated by the complement system. Therefore, complement levels (C3, C4) remain **normal**. In contrast, low complement levels are characteristic of conditions like Systemic Lupus Erythematosus (SLE) or certain types of glomerulonephritis. Note that *Atypical Hemolytic Uremic Syndrome (aHUS)* involves complement dysregulation, but classic TTP does not. **Analysis of incorrect options:** * **A. Microangiopathy:** TTP is a classic Microangiopathic Hemolytic Anemia (MAHA) [1]. The microthrombi in small vessels shear passing RBCs, leading to schistocyte formation. * **B. Neural dysfunction:** Fluctuating neurological symptoms (confusion, seizures, focal deficits) are a hallmark of the TTP pentad, caused by microthrombi in the cerebral vasculature. * **D. Intravascular hemolysis:** The mechanical destruction of RBCs by fibrin strands/microthrombi results in non-immune, intravascular hemolysis (elevated LDH, low haptoglobin, and indirect hyperbilirubinemia) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Pentad (FAT RN):** **F**ever, **A**nemia (MAHA), **T**hrombocytopenia, **R**enal failure, and **N**eurological deficits. * **Diagnosis:** Decreased ADAMTS13 activity (<10%). * **Peripheral Smear:** Presence of **Schistocytes** (helmet cells). * **Coagulation Profile:** PT, aPTT, and Fibrinogen are typically **normal** (distinguishes TTP from DIC). * **Treatment:** Emergency **Plasmapheresis (Plasma Exchange)** is the gold standard. Never delay treatment for ADAMTS13 results.

Q: With oral iron therapy, when can a rise in hemoglobin percentage be observed?

3 weeks. **Explanation:** The therapeutic response to oral iron therapy in patients with iron deficiency anemia (IDA) follows a predictable physiological timeline. While the bone marrow begins producing new red blood cells quickly, a measurable rise in hemoglobin (Hb) concentration takes time to manifest in the peripheral blood. 1. **Why 3 weeks is correct:** After starting oral iron, the **reticulocyte count** peaks within 7–10 days (the earliest sign of response). However, a significant and clinically observable **rise in hemoglobin** (typically 2 g/dL or more) generally takes about **3 weeks**. Complete normalization of hemoglobin levels usually occurs within 2 months of therapy. 2. **Analysis of Incorrect Options:** * **1 week (Option A):** At this stage, only the reticulocyte count increases. Hemoglobin levels have not yet risen significantly. * **4 weeks (Option B) & 6 weeks (Option D):** While hemoglobin continues to rise during these periods, the *initial* observable rise occurs earlier, at the 3-week mark. These options represent the progression toward normalization rather than the first point of measurable increase. **NEET-PG High-Yield Pearls:** * **Earliest sign of response:** Increase in Reticulocyte count (peaks at 7–10 days). * **Rate of Hb rise:** Approximately 0.1 g/dL per day or 0.5–1.0 g/dL per week. * **Duration of therapy:** Iron should be continued for **3–6 months** *after* hemoglobin normalizes to replenish depleted iron stores (measured by Serum Ferritin). * **Best Absorption:** Oral iron is best absorbed on an empty stomach; Vitamin C (Ascorbic acid) enhances absorption, while antacids, tea, and milk inhibit it.

Question 1

Which of the following is NOT included in the differential diagnosis of microangiopathic hemolytic anemia?

Accepted Answer

Myocardial infarction

Answer

Sepsis

Answer

Hemolytic uremic syndrome

Answer

Eclampsia

Question 2

A 33-year-old alcoholic patient on anti-tuberculosis treatment presents with increased serum iron and increased transferrin saturation. What is the most likely diagnosis?

Accepted Answer

Sideroblastic anemia

Answer

Iron deficiency anemia

Answer

Megaloblastic anemia

Answer

Anemia of chronic disease

Question 3

A 47-year-old woman presents with fever, headache, confusion, and jaundice for one week. She underwent a hysterectomy two months ago and recently started estrogen replacement therapy. On admission, her temperature is 38.7 C, blood pressure is 140/90 mm Hg, pulse is 98/min, and respiratory rate is 20/min. She is disoriented to time and place. Physical examination reveals jaundiced sclerae and skin, purpura on the trunk, and bleeding gums. Her platelet count is 25,000/mm3, hematocrit is 24%, and creatinine is 4.9 mg/dL. Lactate dehydrogenase (LDH) and indirect bilirubin are elevated. Coagulation tests are within normal limits, but the bleeding time is increased; fibrin-split products and Coombs test are negative. A peripheral blood smear shows schistocytes, helmet-shaped cells, and cells with a triangular shape. Which of the following is the most likely diagnosis?

Accepted Answer

Thrombotic thrombocytopenic purpura

Answer

Autoimmune hemolytic anemia

Answer

Disseminated intravascular coagulation

Answer

Hemolytic-uremic syndrome

Question 4

Which of the following is the least common presentation of multiple myeloma?

Accepted Answer

Hyperviscocity

Answer

Anemia

Answer

Bone pains

Answer

Infection

Question 5

All are benefits of repeated phlebotomy in hemochromatosis, EXCEPT:

Accepted Answer

Reversal of testicular atrophy

Answer

Improved control of diabetes

Answer

Decrease in skin pigmentation

Answer

Normalization of the liver enzymes

Question 6

Which of the following conditions is typically associated with a normal platelet count?

Accepted Answer

Shaken baby syndrome

Answer

Disseminated intravascular coagulation (DIC)

Answer

Microangiopathic hemolytic anemia

Answer

Splenomegaly

Question 7

Pancytopenia with hypocellular bone marrow is seen in which of the following conditions?

Accepted Answer

Fanconi's anemia

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Hairy cell leukemia

Answer

Myelopthisis

Question 8

Thrombotic thrombocytopenic purpura involves which of the following phenomena, except?

Accepted Answer

High complement level

Answer

Microangiopathy

Answer

Neural dysfunction

Answer

Intravascular hemolysis

Question 9

What is the treatment of choice for anti-CD120 antibody?

Accepted Answer

All low-grade non-Hodgkin's lymphomas

Answer

Relapsed B cell follicular lymphomas

Answer

Relapsed Hodgkin's disease

Answer

Chronic lymphatic leukemia

Question 10

With oral iron therapy, when can a rise in hemoglobin percentage be observed?

Accepted Answer

3 weeks

Answer

1 week

Answer

4 weeks

Answer

6 weeks

Hematology — MCQs

Hematology — MCQs

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