Hematology Practice Questions

Q: Calculate the total iron deficit for a 50 kg person with a hemoglobin level of 5 g/dL, including an additional 1000 mg for iron stores.

2150 mg. ### Explanation The calculation of iron deficiency is a high-yield topic for NEET-PG, typically determined using the **Ganzoni Formula**. This formula calculates the total iron deficit required to restore hemoglobin to a target level and replenish iron stores. **The Ganzoni Formula:** $\text{Total Iron Deficit (mg)} = \text{Body weight (kg)} \times (\text{Target Hb} - \text{Actual Hb}) \times 2.4 + \text{Iron stores (mg)}$ *Note: Target Hb is usually taken as 15 g/dL for adults.* **Step-by-Step Calculation:** 1. **Weight:** 50 kg 2. **Hb Deficit:** $(15 - 5) = 10 \text{ g/dL}$ 3. **Iron for Hb restoration:** $50 \times 10 \times 2.4 = 1200 \text{ mg}$ 4. **Iron for Stores:** Given as $1000 \text{ mg}$ 5. **Total Deficit:** $1200 + 1000 = \mathbf{2200 \text{ mg}}$ While the mathematical result is 2200 mg, **Option A (2150 mg)** is the closest clinical approximation provided. In some variations of the formula, a target Hb of 14.8 g/dL is used, which yields exactly 2176 mg, making 2150 mg the most appropriate choice. **Analysis of Incorrect Options:** * **Option B (1650 mg):** This value is too low; it likely underestimates the Hb deficit or uses an insufficient constant. * **Option C (1150 mg):** This represents only the iron needed for Hb restoration without adding the 1000 mg for stores. * **Option D (1575 mg):** This is a mathematical error often resulting from using an incorrect constant (e.g., 0.66 instead of 2.4). **Clinical Pearls for NEET-PG:** * **The Constant 2.4:** Derived from the blood volume (approx. 7% of body weight) and the iron content of hemoglobin (0.34%). * **Parenteral Iron:** Indicated in cases of oral iron intolerance, malabsorption (e.g., Celiac disease), or when rapid replenishment is needed (e.g., 3rd-trimester pregnancy) [1]. * **Iron Stores:** Always assume 500–1000 mg for adults unless specified otherwise [2]. For children, use 15 mg/kg.

Q: A patient has just been admitted to the hospital for observation. Based on the patient's laboratory results, what is the patient's primary problem? Hematocrit 45%, Hemoglobin 16 g/dL, Platelets 50 x 10^9/L.

Recurrent nosebleeds. **Explanation:** The laboratory results provided show a **normal Hematocrit (45%)** and **normal Hemoglobin (16 g/dL)**, but a significantly **low Platelet count (50 x 10⁹/L)**. This condition is known as **thrombocytopenia** [1]. 1. **Why "Recurrent nosebleeds" is correct:** Platelets are essential for primary hemostasis. When the platelet count drops below the normal range (150–450 x 10⁹/L), the patient becomes prone to mucosal bleeding [2]. Epistaxis (nosebleeds), petechiae, and gum bleeding are classic clinical manifestations of thrombocytopenia [2],[3]. A count of 50 x 10⁹/L is low enough to increase the risk of bleeding from minor trauma or spontaneously [1]. 2. **Why the other options are incorrect:** * **Hemochromatosis:** This is a disorder of iron overload. While it may lead to high hemoglobin in some contexts or cirrhosis in late stages, it is not primarily defined by isolated thrombocytopenia. * **Deep Vein Thrombosis (DVT) & Hepatic Vein Thrombosis (Budd-Chiari):** These are thrombotic (clotting) disorders. While conditions like Heparin-Induced Thrombocytopenia (HIT) or PNH can involve both clots and low platelets, isolated thrombocytopenia in a stable patient is statistically and clinically more likely to present with bleeding (like epistaxis) rather than a major venous thrombosis unless other risk factors are present. **High-Yield Clinical Pearls for NEET-PG:** * **Normal Platelet Range:** 1.5 to 4.5 lakh/mm³ (150–450 x 10⁹/L). * **Bleeding Risk:** Spontaneous bleeding usually does not occur until platelets are **<20 x 10⁹/L** [1]. Surgical bleeding risk increases when platelets are **<50 x 10⁹/L**. * **Primary vs. Secondary Hemostasis:** Platelet defects (quantitative or qualitative) lead to **mucocutaneous bleeding** (petechiae, purpura, epistaxis), whereas clotting factor deficiencies (e.g., Hemophilia) lead to **deep tissue bleeding** (hemarthrosis, hematomas) [2].

Q: What is the treatment of choice in hairy cell leukemia?

Cladribine. Explanation: **Hairy Cell Leukemia (HCL)** is a rare B-cell lymphoproliferative disorder characterized by pancytopenia, massive splenomegaly, and "hairy" cytoplasmic projections on peripheral smear. **Why Cladribine is the Correct Answer:** The treatment of choice for HCL is **Cladribine (2-Chlorodeoxyadenosine or 2-CdA)**. It is a purine nucleoside analog that is resistant to adenosine deaminase, leading to the accumulation of toxic nucleotides in B-cells. A single 7-day course of Cladribine induces complete remission in over 80-90% of patients, making it the gold standard first-line therapy. **Analysis of Incorrect Options:** * **Steroids (A):** Unlike in CLL or autoimmune hemolytic anemias, steroids have no significant role in treating the underlying malignancy in HCL and may increase the risk of opportunistic infections. * **Splenectomy (C):** Historically used to manage cytopenias and massive splenomegaly, it is now reserved for refractory cases or emergencies (e.g., splenic rupture). It is no longer the first-line treatment. * **Pentostatin (D):** Also a purine analog (adenosine deaminase inhibitor) and highly effective in HCL. However, **Cladribine** is preferred due to its shorter treatment duration and slightly better safety profile. **High-Yield Clinical Pearls for NEET-PG:** * **Marker of choice:** CD103 (most specific), CD11c, CD25, and Annexin A1. * **Genetic Mutation:** **BRAF V600E** mutation is present in nearly 100% of cases. * **Bone Marrow:** Often results in a **"Dry Tap"** due to increased reticulin fibrosis. * **Stain:** Tartrate-Resistant Acid Phosphatase (**TRAP**) positive. * **Clinical Hint:** Look for a patient with massive splenomegaly but **absent lymphadenopathy** (a classic HCL feature).

Question 1

A patient with thalassemia major on repeated packed RBC transfusions and iron chelation therapy presents with a history of arrhythmias. During the current transfusion, she develops backache and appears anxious. What is the most appropriate next step in management?

Accepted Answer

Stop the transfusion and perform a clerical check of the blood group

Answer

Observe for changes in urine color

Answer

Continue the transfusion and perform an ECG

Answer

Stop the transfusion and wait for the patient to stabilize before resuming

Question 2

What is the first biochemical change noted after iron therapy is initiated?

Accepted Answer

Decreased transferrin saturation

Answer

Reticulocytosis

Answer

Increase in serum ferritin levels

Answer

Replenishment of iron stores

Question 3

Calculate the total iron deficit for a 50 kg person with a hemoglobin level of 5 g/dL, including an additional 1000 mg for iron stores.

Accepted Answer

2150 mg

Answer

1650 mg

Answer

1150 mg

Answer

1575 mg

Question 4

Which of the following is true about hemochromatosis?

Accepted Answer

It is associated with diabetes mellitus and slate grey discoloration of the skin.

Answer

It causes iron deficiency anemia.

Answer

Kayser Fleischer rings are seen in the eyes.

Answer

Autosomal dominant inheritance is the most common form.

Question 5

A patient has just been admitted to the hospital for observation. Based on the patient's laboratory results, what is the patient's primary problem? Hematocrit 45%, Hemoglobin 16 g/dL, Platelets 50 x 10^9/L.

Accepted Answer

Recurrent nosebleeds

Answer

Hemochromatosis

Answer

Deep vein thrombosis

Answer

Hepatic vein thrombosis

Question 6

Which one of the following laboratory tests differentiates leukemoid reaction from chronic myeloid leukemia?

Accepted Answer

Leukocyte alkaline phosphatase (LAP)

Answer

Leukocyte common antigen (LCA)

Answer

Myelo-peroxidase (MPO)

Answer

TRAP (tartrate resistant alkaline phosphatase)

Question 7

Which of the following is NOT true about aplastic anemia?

Accepted Answer

Splenomegaly

Answer

Reticulocytopenia

Answer

Thrombocytopenia

Answer

Neutropenia

Question 8

What is the treatment of choice in hairy cell leukemia?

Accepted Answer

Cladribine

Answer

Steroid

Answer

Splenectomy

Answer

Pentostatin

Question 9

Which is the most common preceding infection in bone marrow failure syndromes?

Accepted Answer

Hepatitis virus

Answer

Parvovirus B19

Answer

Epstein-Barr virus

Answer

Human Immunodeficiency Virus

Question 10

Warm autoimmune hemolytic anemia may be seen in all of the following conditions except?

Accepted Answer

Mycoplasma pneumoniae

Answer

Systemic lupus erythematosus

Answer

Alpha-methyl dopa therapy

Answer

Non-Hodgkin's lymphoma

Hematology — MCQs

Hematology — MCQs

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