Hematology Practice Questions

Q: All of the following conditions are acquired causes of iron overload, EXCEPT:

Hypothyroidism. **Explanation:** The correct answer is **Hypothyroidism**. Iron overload is characterized by an excess of iron in the body, which can be either hereditary (Primary Hemochromatosis) or acquired (Secondary Hemochromatosis) [1]. **Why Hypothyroidism is the correct answer:** Hypothyroidism is **not** a cause of iron overload. In fact, it is frequently associated with **iron deficiency anemia** due to decreased gastrointestinal absorption of iron, achlorhydria, or heavy menstrual bleeding (menorrhagia) in women [2]. While endocrine disorders like Diabetes Mellitus are *complications* of iron overload, hypothyroidism does not cause it [1]. **Analysis of Incorrect Options:** * **Sideroblastic Anemia:** This is a classic cause of acquired iron overload. Ineffective erythropoiesis leads to increased iron absorption and frequent blood transfusions, resulting in iron deposition in tissues (hemosiderosis). * **Chronic Hepatitis C:** Chronic liver inflammation can lead to elevated ferritin levels and mild-to-moderate hepatic iron overload. It often involves the downregulation of hepcidin or the release of iron from necrotic hepatocytes. * **Nonalcoholic Steatohepatitis (NASH):** Also known as "Dysmetabolic Iron Overload Syndrome," NASH is frequently associated with increased hepatic iron stores, which can further exacerbate oxidative stress and liver fibrosis. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Liver biopsy with Prussian Blue staining (to calculate the Hepatic Iron Index) is the definitive test, though MRI (T2*) is now the preferred non-invasive method. * **Porphyria Cutanea Tarda (PCT):** This condition is strongly associated with iron overload and Hepatitis C [3]. * **Treatment of Choice:** Therapeutic phlebotomy is the mainstay for most iron overload states; however, in anemias like Sideroblastic anemia, **iron chelators** (e.g., Deferasirox, Deferoxamine) are used instead.

Q: Which of the following statements is FALSE regarding hemochromatosis?

Prone to Mycobacterium enteric infections. The correct answer is **D**. Hemochromatosis is a disorder of iron overload, and certain pathogens thrive in high-iron environments. While patients are highly susceptible to specific "siderophilic" (iron-loving) bacteria, **Mycobacterium** species are not typically associated with increased enteric infection risk specifically due to iron overload in hemochromatosis. **Why the other options are true:** * **Vibrio vulnificus (Option A & C):** This is a high-yield association. *Vibrio* requires free iron for rapid growth and virulence. Patients with hemochromatosis are at a significantly higher risk of fatal septicemia from *Vibrio vulnificus* after consuming **raw seafood/shellfish** or through wound exposure to seawater. * **Yersinia enterocolitica (Option B):** *Yersinia* is a siderophilic organism that cannot produce its own siderophores (iron-binding molecules) efficiently. In an iron-overloaded host, the excess iron facilitates its proliferation, leading to severe enterocolitis or sepsis. * **Listeria monocytogenes:** Though not listed, it is another siderophilic organism to remember. **Clinical Pearls for NEET-PG:** * **The "Bronze Diabetes" Triad:** Skin hyperpigmentation, Diabetes Mellitus, and Cirrhosis [1]. * **Most Common Cause of Death:** Historically cirrhosis; however, currently, **Hepatocellular Carcinoma (HCC)** is the leading cause of death in treated patients [1]. * **Cardiac Involvement:** Most common manifestation is **Restrictive Cardiomyopathy**, though dilated cardiomyopathy can also occur. * **Joints:** Characterized by "hook-like" osteophytes in the 2nd and 3rd MCP joints and pseudogout (CPPD). * **Screening:** Best initial test is **Transferrin Saturation** (>45%) [3]; Gold standard for diagnosis is **HFE gene analysis** [1],[2].

Q: Which of the following is preferred in an elderly woman with macrocytic anemia and early signs of neurological deficit?

Hydroxycobalamine. The clinical presentation of **macrocytic anemia** combined with **neurological deficits** (such as paresthesia, loss of vibration/position sense, or ataxia) is a classic hallmark of **Vitamin B12 (Cobalamin) deficiency**. [1] **1. Why Hydroxycobalamine is Correct:** In Vitamin B12 deficiency, neurological symptoms occur due to the failure of myelin synthesis (Subacute Combined Degeneration of the Spinal Cord). **Hydroxycobalamine** is the preferred parenteral form of B12 because it has a longer half-life and better tissue retention compared to cyanocobalamin. In patients with neurological deficits, parenteral administration is mandatory to bypass potential malabsorption (e.g., Pernicious Anemia) and ensure rapid correction to prevent permanent nerve damage. **2. Why Other Options are Incorrect:** * **Folic acid:** While it can correct the megaloblastic anemia, it **cannot** treat the neurological symptoms [2]. In fact, giving folic acid alone in B12 deficiency can "mask" the anemia while allowing the neurological damage to progress irreversibly. * **Erythropoietin:** This is used for anemia of chronic kidney disease or certain malignancies; it has no role in nutritional macrocytic anemia. * **Iron dextran:** This is used for iron-deficiency anemia (microcytic), not macrocytic anemia. **Clinical Pearls for NEET-PG:** * **The "Folate Trap":** Always rule out B12 deficiency before starting Folic acid. * **Earliest Sign:** Hypersegmented neutrophils on a peripheral smear are the earliest sign of megaloblastic anemia. * **Biochemical Markers:** In B12 deficiency, both **Methylmalonic Acid (MMA)** and **Homocysteine** levels are elevated. In Folate deficiency, only Homocysteine is elevated. * **Neurological involvement:** Only B12 deficiency causes neurological symptoms; Folate deficiency does not. [1]

Q: Megaloblastic anemia may be caused by all of the following, except?

Long term aspirin intake. **Explanation:** Megaloblastic anemia is characterized by impaired DNA synthesis, leading to a maturation delay between the nucleus and the cytoplasm (nuclear-cytoplasmic asynchrony). [1] This results in large, nucleated RBC precursors in the bone marrow and macrocytic cells in the peripheral blood. [1] **Why Option D is Correct:** **Long-term aspirin intake** is associated with gastrointestinal bleeding and chronic blood loss, which typically leads to **Iron Deficiency Anemia (Microcytic Hypochromic)**. Aspirin does not interfere with DNA synthesis or the metabolism of Vitamin B12 or Folate; therefore, it does not cause megaloblastic changes. **Why the other options are incorrect:** * **Vitamin B12 and Folic Acid Deficiency (Options B & C):** These are the most common causes. [1] Both are essential cofactors for DNA synthesis. B12 is required for the conversion of homocysteine to methionine, and Folate is required for thymidylate synthesis. [1] Deficiency leads to ineffective erythropoiesis. * **Dilantin (Phenytoin) Toxicity (Option A):** Phenytoin is a well-known cause of drug-induced megaloblastic anemia. It interferes with folate metabolism by inhibiting intestinal folate conjugase (reducing absorption) and increasing the catabolism of folate. **NEET-PG High-Yield Pearls:** 1. **Drug-induced Megaloblastic Anemia:** Common culprits include **Methotrexate** (DHFR inhibitor), **Phenytoin**, **Pyrimethamine**, **Trimethoprim**, and **Zidovudine (AZT)**. 2. **Pernicious Anemia:** The most common cause of B12 deficiency, caused by autoimmune destruction of gastric parietal cells (leading to Intrinsic Factor deficiency). [1] 3. **Peripheral Smear Findings:** Look for **Hypersegmented Neutrophils** (>5 lobes) and **Macro-ovalocytes**. 4. **Biochemical Markers:** Both B12 and Folate deficiency show elevated **Homocysteine**, but only B12 deficiency shows elevated **Methylmalonic Acid (MMA)**.

Q: Cryoprecipitate is a rich source of which of the following?

Factor VIII. **Explanation:** Cryoprecipitate is a blood product prepared by thawing one unit of Fresh Frozen Plasma (FFP) at 1–6°C and collecting the insoluble precipitate. It is a concentrated source of specific clotting factors, making it the treatment of choice for specific consumptive coagulopathies [1]. **Why Factor VIII is correct:** Cryoprecipitate is specifically enriched with five key components [1]: 1. **Factor VIII** (Anti-hemophilic factor) 2. **Fibrinogen** (Factor I) – It is the most concentrated source available. 3. **von Willebrand Factor (vWF)** 4. **Factor XIII** (Fibrin stabilizing factor) 5. **Fibronectin** **Why the other options are incorrect:** * **Option A (Thromboplastin):** Also known as Factor III or Tissue Factor, it is not a plasma-derived component found in cryoprecipitate; it is released from damaged tissues to initiate the extrinsic pathway. * **Option C (Factor X) and Option D (Factor VII):** These are vitamin K-dependent clotting factors. Along with Factors II and IX, these remain in the supernatant (the "cryo-poor" plasma) after the cryoprecipitate is removed [1]. To replace these, one would use FFP or Prothrombin Complex Concentrate (PCC). **High-Yield Clinical Pearls for NEET-PG:** * **Primary Indication:** Hypofibrinogenemia (e.g., in DIC or massive hemorrhage). * **Dosage:** One bag of cryoprecipitate typically raises the fibrinogen level by 5–10 mg/dL. * **Storage:** It is stored at -18°C or colder and has a shelf life of 1 year. Once thawed, it must be used within 6 hours (or 4 hours if pooled). * **Note on Hemophilia A:** While it contains Factor VIII, recombinant or plasma-derived Factor VIII concentrates are now preferred over cryoprecipitate to reduce the risk of transfusion-transmitted infections.

Q: In Beta thalassemia, what is the characteristic change in globin chain production?

Decrease in beta chain, increase in alpha chain. ### Explanation **Core Concept:** Beta thalassemia is a quantitative hemoglobinopathy caused by mutations in the *HBB* gene on chromosome 11. This results in **reduced ($\beta^+$) or absent ($\beta^0$) synthesis of beta-globin chains**. The hallmark of the disease is the **imbalance** between alpha and beta chains. Since alpha-chain production remains normal while beta-chain production is deficient, there is a **relative excess of free alpha-globin chains**. These unpaired alpha chains are unstable; they precipitate within erythroid precursors in the bone marrow and mature red cells, causing membrane damage, ineffective erythropoiesis, and extravascular hemolysis. **Analysis of Options:** * **Option B (Correct):** Accurately describes the primary defect (decreased beta) and the secondary consequence (relative increase/excess of alpha). * **Option A & D:** Incorrect because beta chain production is never increased in thalassemia; it is a disease of deficiency. * **Option C:** Incorrect because alpha chain production is not decreased in beta-thalassemia (that would be alpha-thalassemia). In fact, the co-inheritance of alpha-thalassemia with beta-thalassemia actually *improves* the condition by reducing the chain imbalance. **NEET-PG High-Yield Pearls:** * **Diagnosis:** Gold standard is **Hb Electrophoresis**, showing increased **HbA2 (>3.5%)** and increased **HbF**. * **Peripheral Smear:** Microcytic hypochromic anemia with **Target cells** and basophilic stippling. * **Mentzer Index:** (MCV/RBC count) ** 13 suggests Iron Deficiency Anemia. * **Radiology:** "Hair-on-end" appearance on skull X-ray due to compensatory extramedullary hematopoiesis. * **Complication:** Secondary hemochromatosis (iron overload) due to chronic transfusions and increased intestinal absorption.

Q: A 42-year-old man presents with chronic fatigue. His hemoglobin is 11.5 g/dL, and the blood film shows hypochromic and microcytic red blood cells. Laboratory findings include increased serum iron, normal total iron-binding capacity (TIBC), increased ferritin, and decreased HbA2. What is the most likely diagnosis for this patient presenting with hypochromic microcytic anemia?

Sideroblastic anemia. ### Explanation The correct diagnosis is **Sideroblastic Anemia**. This condition is characterized by a defect in heme synthesis (most commonly due to a deficiency in the enzyme ALA synthase or mitochondrial dysfunction), leading to iron accumulation within the mitochondria of developing erythroblasts. **Why Sideroblastic Anemia is correct:** The hallmark of sideroblastic anemia is **iron overload** despite the presence of microcytic anemia. Because heme cannot be synthesized, iron is not utilized and instead builds up in the body. This results in: * **Increased Serum Iron** and **Increased Ferritin** (reflecting high iron stores). * **Normal/Decreased TIBC** (as the body is saturated with iron). * **Hypochromic Microcytic RBCs** (due to deficient hemoglobin production). **Why other options are incorrect:** * **Iron Deficiency Anemia (IDA):** Characterized by **decreased** serum iron and ferritin, and **increased** TIBC. * **Beta-Thalassemia Trait:** Typically presents with a very low MCV but **increased HbA2** (>3.5%) and normal to high iron studies. This patient has decreased HbA2. * **Anemia of Chronic Disease (ACD):** Usually presents with **decreased** serum iron and **decreased** TIBC [1]. While ferritin is increased (as it is an acute-phase reactant), the serum iron is never elevated [1]. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Bone marrow examination showing **Ringed Sideroblasts** (Prussian blue stain). * **Common Causes:** Alcohol (most common), Lead poisoning, Isoniazid (B6 deficiency), and X-linked ALA synthase deficiency. * **Treatment:** Pyridoxine (Vitamin B6) is the first-line treatment for hereditary and Isoniazid-induced cases. * **Mentzer Index:** (MCV/RBC count) 13 suggests IDA. Sideroblastic anemia often mimics IDA on peripheral smear but is distinguished by iron studies.

Q: Transfusing blood after prolonged storage could lead to which of the following?

Potassium toxicity. **Explanation:** The correct answer is **Potassium toxicity**. This occurs due to the phenomenon known as the **"Storage Lesion"** of red blood cells. **Why Potassium Toxicity?** During storage, the Na+/K+-ATPase pump on the red blood cell (RBC) membrane becomes inactive due to the cold temperature (1–6°C) and depletion of ATP. Consequently, potassium leaks out of the RBCs into the plasma, while sodium enters the cells. The longer the blood is stored, the higher the extracellular potassium concentration becomes. In massive transfusions or transfusions in neonates and patients with renal failure, this can lead to life-threatening hyperkalemia. **Analysis of Incorrect Options:** * **Citrate Intoxication:** While citrate is used as an anticoagulant in blood bags, toxicity usually occurs during **massive transfusion** (rapid infusion of >10 units) where the liver cannot metabolize citrate quickly enough, leading to hypocalcemia. It is less dependent on the *duration* of storage. * **Circulatory Overload (TACO):** This is a complication related to the **volume and rate** of infusion, particularly in elderly patients or those with heart failure, rather than the age of the stored blood. * **Haemorrhagic Diathesis:** This refers to bleeding tendencies. While massive transfusion of stored blood can cause dilutional coagulopathy (due to lack of viable platelets and factors V and VIII), it is not the primary biochemical consequence of "prolonged storage" itself. **High-Yield Clinical Pearls for NEET-PG:** * **Storage Lesion Changes:** ↓ pH (lactic acid accumulation), ↓ 2,3-DPG (shifting the oxygen dissociation curve to the **left**), ↓ ATP, and ↑ Potassium. * **Shelf Life:** Whole blood/PRBCs are typically stored for **35–42 days** depending on the preservative (CPDA-1 vs. SAGM). * **Fresh Blood:** Defined as blood stored for <7 days; preferred in neonates to avoid hyperkalemia and ensure adequate 2,3-DPG levels.

Question 1

A 58-year-old woman presents with a 6-month history of backache and recurrent chest infections. She develops sudden weakness of the legs and urinary retention. Investigations reveal a hemoglobin of 7.3 g/dL, serum calcium of 12.6 mg/dL, phosphate of 2.5 mg/dL, alkaline phosphatase of 100 U/L, serum albumin of 3 g/dL, globulin of 7.1 g/dL, and urea of 178 mg/dL. What is the most likely diagnosis?

Accepted Answer

Multiple myeloma

Answer

Lung cancer

Answer

Disseminated tuberculosis

Answer

Osteoporosis

Question 2

All of the following conditions are acquired causes of iron overload, EXCEPT:

Accepted Answer

Hypothyroidism

Answer

Sideroblastic anemia

Answer

Chronic Hepatitis C

Answer

Nonalcoholic steatohepatitis

Question 3

Which of the following statements is FALSE regarding hemochromatosis?

Accepted Answer

Prone to Mycobacterium enteric infections

Answer

Prone to fatal Vibrio enteric infections

Answer

Prone to fatal Yersinia enteric infections

Answer

Should avoid raw fish

Question 4

Which of the following is preferred in an elderly woman with macrocytic anemia and early signs of neurological deficit?

Accepted Answer

Hydroxycobalamine

Answer

Folic acid

Answer

Erythropoietin

Answer

Iron dextran

Question 5

Megaloblastic anemia may be caused by all of the following, except?

Accepted Answer

Long term aspirin intake

Answer

Dilantin toxicity

Answer

Vitamin B12 deficiency

Answer

Folic acid deficiency

Question 6

Cryoprecipitate is a rich source of which of the following?

Accepted Answer

Factor VIII

Answer

Thromboplastin

Answer

Factor X

Answer

Factor VII

Question 7

What is true about Thrombocytopenic purpura?

Accepted Answer

Thrombosis in cerebral blood vessels

Answer

Hemolysis is extravascular

Answer

Normal renal function tests

Answer

Immediate cure following plasmapheresis

Question 8

In Beta thalassemia, what is the characteristic change in globin chain production?

Accepted Answer

Decrease in beta chain, increase in alpha chain

Answer

Increase in beta chain, decrease in alpha chain

Answer

Decrease in beta chain, decrease in alpha chain

Answer

Increase in beta chain, increase in alpha chain

Question 9

A 42-year-old man presents with chronic fatigue. His hemoglobin is 11.5 g/dL, and the blood film shows hypochromic and microcytic red blood cells. Laboratory findings include increased serum iron, normal total iron-binding capacity (TIBC), increased ferritin, and decreased HbA2. What is the most likely diagnosis for this patient presenting with hypochromic microcytic anemia?

Accepted Answer

Sideroblastic anemia

Answer

Iron deficiency anemia

Answer

Beta-thalassemia trait

Answer

Anemia of chronic disease

Question 10

Transfusing blood after prolonged storage could lead to which of the following?

Accepted Answer

Potassium toxicity

Answer

Citrate intoxication

Answer

Circulatory overload

Answer

Haemorrhagic diathesis

Hematology — MCQs

Hematology — MCQs

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