Hematology Practice Questions

Q: A patient presents with ecchymosis and petechiae all over the body, with no hepato-splenomegaly. All of the following are true regarding this condition EXCEPT:

Bleeding into the joints. The clinical presentation of petechiae and ecchymosis without hepatosplenomegaly strongly suggests **Immune Thrombocytopenic Purpura (ITP)**. In ITP, there is isolated thrombocytopenia due to autoantibody-mediated destruction of platelets [1]. ### **Explanation of Options** * **Option B (Correct Answer):** Bleeding into the joints (**Hemarthrosis**) is a hallmark of **coagulation factor deficiencies** (e.g., Hemophilia), not platelet disorders [1]. Platelet disorders (like ITP) typically present with superficial "mucocutaneous" bleeding, such as petechiae, purpura, epistaxis, and gum bleeding [1]. * **Option A:** In ITP, the bone marrow responds to peripheral platelet destruction by increasing production. Therefore, an **increased number of megakaryocytes** (platelet precursors) is a classic compensatory finding. * **Option C:** The primary pathology is the immune-mediated destruction of platelets in the spleen, leading to **decreased platelets** (thrombocytopenia) in the peripheral blood [1]. * **Option D:** This describes **Acute ITP**, which is most common in children following a viral infection. It is typically self-limiting, with approximately **80% of cases resolving spontaneously** within weeks to months. ### **NEET-PG High-Yield Pearls** * **ITP Diagnosis:** It is a diagnosis of exclusion. The presence of splenomegaly should prompt a search for other causes (e.g., Leukemia, Cirrhosis) [2]. * **First-line Treatment:** Corticosteroids (Prednisolone) or IVIG. * **Platelet Transfusion:** Generally contraindicated in ITP unless there is life-threatening hemorrhage, as the autoantibodies will destroy the transfused platelets rapidly. * **Chronic ITP:** Defined as thrombocytopenia persisting for >12 months; more common in adults [1].

Q: A 25-year-old female presents with complaints of fever and weakness. On examination, there is splenomegaly of 3 cm below the costal margin. Her Hb is 8 gm/dL, TLC is 3,000/mm3, and platelet count is 80,000 mm3. Which of the following is the least likely diagnosis?

Aplastic anemia. ### Explanation The patient presents with **pancytopenia** (anemia, leucopenia, and thrombocytopenia) and **splenomegaly**. The key to solving this question lies in the clinical finding of an enlarged spleen [1]. **1. Why Aplastic Anemia is the Correct Answer (Least Likely):** Aplastic anemia is characterized by bone marrow failure leading to pancytopenia. A fundamental clinical rule in hematology is that **Aplastic Anemia does not cause splenomegaly.** If a patient with pancytopenia has an enlarged spleen, the clinician must look for alternative diagnoses like leukemia, myelofibrosis, or hypersplenism [2]. The presence of splenomegaly in a suspected case of aplastic anemia should prompt a search for an "infiltrative" cause rather than primary marrow failure. **2. Analysis of Other Options:** * **Acute Lymphocytic Leukemia (ALL):** This is a common cause of pancytopenia due to marrow infiltration by blasts. Splenomegaly is a frequent finding in ALL due to extramedullary involvement. * **Anemia of Chronic Disease (ACD):** While typically presenting as isolated anemia, chronic inflammatory states or infections (like Tuberculosis or Kala-azar) can cause both cytopenias and reactive splenomegaly. * **Megaloblastic Anemia:** Severe Vitamin B12 or Folate deficiency leads to ineffective erythropoiesis, often resulting in pancytopenia. Mild to moderate splenomegaly is seen in about 10–15% of these cases. **3. Clinical Pearls for NEET-PG:** * **Pancytopenia + Splenomegaly:** Think of Malaria, Kala-azar, Leukemia, Lymphoma, Cirrhosis (Portal Hypertension), or Gaucher’s disease. * **Pancytopenia - Splenomegaly:** Think of Aplastic Anemia, PNH (Paroxysmal Nocturnal Hemoglobinuria), or early-stage Myelodysplastic Syndrome (MDS). * **Gold Standard:** The definitive investigation to differentiate these conditions is a **Bone Marrow Aspiration and Biopsy**. In Aplastic Anemia, the marrow will be "hypocellular" with increased fat spaces.

Q: What is the basic defect in Hemoglobin S?

Altered solubility. ### Explanation The fundamental defect in **Hemoglobin S (HbS)** is a qualitative change in the beta-globin chain, where **glutamic acid** (polar/hydrophilic) is replaced by **valine** (non-polar/hydrophobic) at the **6th position** [1]. **1. Why "Altered Solubility" is Correct:** The substitution of a hydrophobic amino acid (valine) creates a "sticky patch" on the surface of the hemoglobin molecule. In the **deoxygenated state**, these patches interact, causing HbS molecules to polymerize into long, rigid insoluble fibers [2]. This **polymerization** (decreased solubility) distorts the red blood cell into a sickle shape, leading to vaso-occlusion and hemolysis. **2. Analysis of Incorrect Options:** * **Altered Function:** While the clinical outcome is dysfunctional, the "basic defect" refers to the physical property change (solubility) that precedes the functional failure. * **Altered Stability:** This refers to **unstable hemoglobins** (e.g., Hb Koln) that precipitate as Heinz bodies. HbS is stable until it deoxygenates. * **Altered Oxygen Binding Capacity:** This is characteristic of **Hemoglobin M** (methemoglobinemia) or high-affinity variants (e.g., Hb Chesapeake) [3]. HbS actually has a *decreased* oxygen affinity (right shift of the dissociation curve), but this is a secondary effect, not the primary defect. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Recessive; Point mutation (Missense) in the HBB gene on Chromosome 11. * **Sickling Triggers:** Hypoxia, acidosis, dehydration, and cold. * **Protective Factor:** HbF (Fetal Hemoglobin) inhibits polymerization; hence, Hydroxyurea (which increases HbF) is the treatment of choice. * **Metabolic Benefit:** Heterozygotes (Sickle cell trait) have a survival advantage against *Plasmodium falciparum* malaria.

Q: What is the most common site of histiocytosis?

Bone. Langerhans Cell Histiocytosis (LCH) is a rare proliferative disorder of dendritic (Langerhans) cells. For NEET-PG, it is crucial to recognize that LCH can present as a single-system or multi-system disease. **1. Why Bone is the Correct Answer:** The **bone** is the most frequently involved organ in LCH, affected in approximately **80% of cases**. The most common site within the skeletal system is the **skull** (calvarium), followed by the femur, ribs, and mandible. Radiographically, these appear as "punched-out" lytic lesions without a sclerotic rim. In the mandible, it often causes the characteristic "floating teeth" appearance. **2. Why Other Options are Incorrect:** * **Skin:** This is the second most common site (approx. 30–40%). It often presents as a seborrheic dermatitis-like rash, particularly in infants (Letterer-Siwe disease). * **Lung:** While common in adult smokers (Pulmonary LCH), it is less frequent than bone involvement across the general population. * **Liver:** Involvement of the liver, spleen, or hematopoietic system signifies "high-risk" organ involvement and carries a poorer prognosis, but these are not the most common sites. **Clinical Pearls for NEET-PG:** * **Pathognomonic Marker:** **Birbeck granules** (tennis-racket shaped) seen on Electron Microscopy. * **Immunohistochemistry (IHC):** Positive for **CD1a, S100, and CD207 (Langerin)**. * **Hand-Schüller-Christian Triad:** Lytic bone lesions, exophthalmos, and diabetes insipidus. * **BRAF V600E mutation** is identified in about 50% of cases.

Q: Platelet transfusions must be completed within how many hours after the blood bag is issued from the blood bank?

4 hours. ### Explanation **Correct Answer: D. 4 hours** **Medical Rationale:** The primary reason for the strict 4-hour time limit for completing a platelet transfusion is the **risk of bacterial contamination**. Unlike Red Blood Cells (RBCs), which are stored at 2–6°C, platelets are stored at room temperature (20–24°C) with continuous agitation. This warmer environment is highly conducive to the rapid proliferation of bacteria. Once the blood bag is issued and the "cold chain" or controlled environment is breached, the risk of septic transfusion reactions increases significantly. To minimize this risk, international guidelines (including AABB and WHO) mandate that the infusion must be completed within 4 hours. **Analysis of Incorrect Options:** * **Option A (1 hour):** While platelets should be started as soon as possible (ideally within 30 minutes of issue), 1 hour is too restrictive for the total infusion time, especially in patients at risk of volume overload. * **Option B & C (2-3 hours):** Although most platelet transfusions are completed within 30–60 minutes, these timeframes do not represent the maximum safety limit established by transfusion medicine protocols. **High-Yield Clinical Pearls for NEET-PG:** * **Storage:** Platelets are stored at **20–24°C** with constant agitation to prevent aggregation and maintain viability. * **Shelf Life:** They have the shortest shelf life of all blood components, typically only **5 days**. * **Filter:** Must be administered through a standard **170–200 micron** filter. * **Dose Response:** One unit of random donor platelets (RDP) typically increases the platelet count by **5,000–10,000/µL** in a 70kg adult. * **Complication:** Platelets are the blood component most commonly associated with **transfusion-transmitted bacterial sepsis** [1].

Q: Which of the following investigations is least useful in the diagnosis of multiple myeloma?

Bone scan. The diagnosis of Multiple Myeloma (MM) relies on identifying monoclonal plasma cell proliferation and associated end-organ damage (CRAB features) [1]. **Why Bone Scan is the least useful:** In Multiple Myeloma, bone destruction is mediated by **osteoclast** activation and the inhibition of osteoblasts. A **Technetium-99m bone scan** detects areas of increased osteoblastic activity (bone formation). Because myeloma lesions are purely **lytic** (punched-out) with little to no osteoblastic reaction, bone scans often yield false-negative results. Therefore, they are not recommended for screening or diagnosis. **Analysis of other options:** * **X-ray (Skeletal Survey):** Traditionally the first-line imaging. It identifies classic "punched-out" lytic lesions, especially in the skull, spine, and pelvis [1]. * **Bone Marrow Biopsy:** A mandatory diagnostic tool. It confirms the presence of clonal plasma cells (≥10% required for diagnosis) and allows for cytogenetic studies (FISH) [1]. * **ESR:** While non-specific, ESR is almost always markedly elevated (often >100 mm/hr) in MM due to the "Rouleaux formation" caused by high levels of monoclonal paraproteins (M-spike) [1]. **NEET-PG High-Yield Pearls:** * **Imaging Gold Standard:** Whole-body low-dose CT (WBLDCT) or MRI is now preferred over X-ray for higher sensitivity. * **Mnemonic CRAB:** **C**alcium (elevated), **R**enal insufficiency, **A**nemia, **B**one lesions. * **Bence-Jones Proteins:** These are free light chains found in urine; they are *not* detected by standard dipsticks (which detect albumin). * **Diagnostic Hallmark:** Presence of **M-spike** on Serum Protein Electrophoresis (SPEP), usually in the Gamma globulin region.

Q: Calculate the iron deficit for a 60 kg person with a hemoglobin of 5 g/dL, assuming 1000 mg is required for iron stores.

2500 mg. ### Explanation The calculation of iron deficit is a high-yield topic for NEET-PG, typically determined using the **Ganzoni Formula**. This formula accounts for both the iron needed to restore hemoglobin to normal levels and the iron required to replenish body stores. **The Ganzoni Formula:** $\text{Total Iron Deficit (mg)} = \text{Body weight (kg)} \times (\text{Target Hb} - \text{Actual Hb}) \times 2.4 + \text{Iron Stores (mg)}$ **Step-by-Step Calculation:** 1. **Target Hb:** Usually taken as 15 g/dL for adults. 2. **Hb Deficit:** $15 - 5 = 10 \text{ g/dL}$. 3. **Iron for Hb restoration:** $60 \text{ kg} \times 10 \text{ g/dL} \times 2.4 = 1440 \text{ mg}$. 4. **Iron for Stores:** $1000 \text{ mg}$ (as specified in the question). 5. **Total Deficit:** $1440 + 1000 = 2440 \text{ mg}$. Rounding to the nearest clinical value, **2500 mg (Option B)** is the correct answer. --- ### Analysis of Incorrect Options * **Option A (1500 mg):** This value roughly covers only the hemoglobin deficit ($1440 \text{ mg}$) while neglecting the $1000 \text{ mg}$ required for iron stores. * **Option C (3500 mg) & D (4000 mg):** These values significantly overestimate the deficit for a $60 \text{ kg}$ individual. Such high doses could lead to iron toxicity if administered parenterally without calculation. --- ### Clinical Pearls for NEET-PG * **The Constant (2.4):** This factor is derived from the blood volume ($0.07 \text{ L/kg}$) and the iron content of hemoglobin ($0.34\%$). * **Iron Stores:** If not specified in the question, use $500 \text{ mg}$ for individuals $ 35 \text{ kg}$. * **Indication:** Parenteral iron is indicated when oral iron is poorly tolerated, in cases of malabsorption (e.g., Celiac disease), or when rapid replenishment is needed (e.g., 3rd-trimester pregnancy) [1].

Q: A patient presents with fatigue, anemia, and hepatomegaly. Hemoglobin electrophoresis reveals the presence of HbS. What will be the appropriate treatment?

Hydroxyurea. Correct: Hydroxyurea - This is the primary disease-modifying therapy for Sickle Cell Disease (SCD), significantly reducing the frequency of vaso-occlusive crises and acute chest syndrome [1]. - It works by increasing the production of fetal hemoglobin (HbF), which interferes with HbS polymerization and subsequent sickling of red blood cells [1]. - Hydroxyurea is the first-line chronic management for symptomatic SCD patients [1]. *Incorrect: Blood transfusion* - Transfusions are reserved for acute, life-threatening complications of SCD, such as aplastic crisis, severe exacerbation of anemia, or prevention of stroke in high-risk patients [1]. - Chronic routine transfusions carry risks of iron overload (hemosiderosis) and alloimmunization, making them generally unsuitable for standard chronic management. *Incorrect: Iron supplementation* - Sickle cell anemia is a hemolytic anemia typically resulting in elevated iron stores due to chronic hemolysis, and if transfusions are given, iron overload (hemosiderosis) is a major concern. - Iron supplementation is contraindicated unless a specific, documented iron deficiency is present, as it can worsen iron deposition in vital organs. *Incorrect: Vitamin B12 supplementation* - Vitamin B12 is primarily used to treat megaloblastic anemia resulting from B12 deficiency (e.g., pernicious anemia). - SCD anemia is caused by chronic extravascular hemolysis, and while folic acid is often required due to high cell turnover, B12 is not the targeted treatment for HbS pathology.

Q: A patient has cheilosis with koilonychia and anemia. Diagnosis is?

Plummer-Vinson syndrome. ***Plummer-Vinson syndrome***- This syndrome is defined by the classic triad of **dysphagia** (due to esophageal webs), **iron deficiency anemia**, and mucosal changes, which include **cheilosis** (angular stomatitis) and **koilonychia** (spoon nails) [1].- It is most common in middle-aged women and results from chronic, severe **iron deficiency**, which causes the epithelial atrophy leading to the observed symptoms [1].*Esophageal cancer*- While **Plummer-Vinson syndrome** is a pre-malignant condition that increases the risk of **esophageal squamous cell carcinoma**, the current presentation describes the syndrome's classic signs, not confirmed malignancy.- Malignancy typically causes progressive **dysphagia** and severe **weight loss**, and the specific triad of **cheilosis** and **koilonychia** is not the primary diagnostic feature.*Achalasia cardia*- This is a **primary esophageal motility disorder** characterized by the poor relaxation of the **lower esophageal sphincter (LES)** and aperistalsis of the esophageal body.- The main symptoms are **dysphagia** (to both solids and liquids) and **regurgitation**, but it is not associated with the systemic features of **iron deficiency anemia**, **cheilosis**, or **koilonychia**.*Tylosis palmaris*- **Tylosis palmaris** is a form of **palmoplantar keratoderma**, an inherited disorder causing marked hyperkeratosis (thickening) of the palms and soles.- Although it is strongly associated with an increased risk for **esophageal squamous cell carcinoma** (Howel-Evans syndrome), it does not cause the specific features of **iron deficiency anemia**, **cheilosis**, and **koilonychia**.

Question 1

A patient presents with ecchymosis and petechiae all over the body, with no hepato-splenomegaly. All of the following are true regarding this condition EXCEPT:

Accepted Answer

Bleeding into the joints

Answer

Increased megakaryocytes in bone marrow

Answer

Decreased platelets in the blood

Answer

The disease resolves spontaneously in 80% of patients within 2-6 weeks

Question 2

A 25-year-old female presents with complaints of fever and weakness. On examination, there is splenomegaly of 3 cm below the costal margin. Her Hb is 8 gm/dL, TLC is 3,000/mm3, and platelet count is 80,000 mm3. Which of the following is the least likely diagnosis?

Accepted Answer

Aplastic anemia

Answer

Acute lymphocytic leukemia

Answer

Anemia of chronic disease

Answer

Megaloblastic anemia

Question 3

What is the basic defect in Hemoglobin S?

Accepted Answer

Altered solubility

Answer

Altered function

Answer

Altered stability

Answer

Altered oxygen binding capacity

Question 4

What is the most common site of histiocytosis?

Accepted Answer

Bone

Answer

Skin

Answer

Lung

Answer

Liver

Question 5

Platelet transfusions must be completed within how many hours after the blood bag is issued from the blood bank?

Accepted Answer

4 hours

Answer

1 hour

Answer

2 hours

Answer

3 hours

Question 6

A 65-year-old man presents with anaemia and posterior column dysfunction. What is the likely cause?

Accepted Answer

Vitamin B12 deficiency

Answer

Vitamin B1 deficiency

Answer

Subacute sclerosing panencephalitis

Answer

Multiple sclerosis

Question 7

Which of the following investigations is least useful in the diagnosis of multiple myeloma?

Accepted Answer

Bone scan

Answer

Erythrocyte Sedimentation Rate (ESR)

Answer

X-ray

Answer

Bone marrow biopsy

Question 8

Calculate the iron deficit for a 60 kg person with a hemoglobin of 5 g/dL, assuming 1000 mg is required for iron stores.

Accepted Answer

2500 mg

Answer

1500 mg

Answer

3500 mg

Answer

4000 mg

Question 9

A patient presents with fatigue, anemia, and hepatomegaly. Hemoglobin electrophoresis reveals the presence of HbS. What will be the appropriate treatment?

Accepted Answer

Hydroxyurea

Answer

Blood transfusion

Answer

Iron supplementation

Answer

Vitamin B12 supplementation

Question 10

A patient has cheilosis with koilonychia and anemia. Diagnosis is?

Accepted Answer

Plummer-Vinson syndrome

Answer

Esophageal cancer

Answer

Achalasia cardia

Answer

Tylosis palmaris

Hematology — MCQs

Hematology — MCQs

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