Hematology Practice Questions

Q: A young patient is hospitalized with petechiae of the oral mucous membrane, marginal gingival hemorrhage, and a platelet count of 45,000/cc. The bleeding time (BT) and clot retraction time are increased, while RBC and TLC are normal. What condition is the patient likely suffering from?

Thrombocytopenic purpura. The clinical presentation of petechiae and mucosal bleeding (gingival hemorrhage) points toward a **primary hemostatic defect** [1]. The laboratory findings of a low platelet count (**45,000/cc**; normal: 1.5–4.5 lakh/cc) and a prolonged **Bleeding Time (BT)** are classic hallmarks of **Thrombocytopenic Purpura** [2]. In this condition, the reduction in platelet numbers impairs the formation of the primary platelet plug. Furthermore, **Clot Retraction Time** is increased because clot retraction is a platelet-dependent process (mediated by the protein thrombosthenin). Normal RBC and TLC counts help rule out generalized bone marrow failure or malignancy. [3] **Analysis of Incorrect Options:** * **Infectious Mononucleosis:** While it can occasionally cause mild thrombocytopenia, it typically presents with a triad of fever, pharyngitis, and lymphadenopathy, with characteristic atypical lymphocytes on a blood smear (increased TLC). * **Leukemia:** Although leukemia causes thrombocytopenia, it is almost always accompanied by significant abnormalities in the **RBC count** (anemia) and **TLC** (either marked leukocytosis with blasts or leukopenia), which are normal in this patient. [3] * **Hemophilia:** This is a secondary hemostatic defect (clotting factor deficiency). It presents with deep tissue hematomas or hemarthrosis [1]. The **Bleeding Time and platelet count are normal** in hemophilia; only the aPTT is prolonged. **NEET-PG High-Yield Pearls:** * **BT vs. CT:** Bleeding Time (BT) assesses platelet function/number; Clotting Time (CT) assesses the coagulation cascade. * **Clot Retraction:** Directly proportional to the platelet count and inversely proportional to the red cell mass. * **Dry vs. Wet Purpura:** Mucosal bleeding (as seen here) is termed "wet purpura" and indicates a higher risk of life-threatening intracranial hemorrhage compared to "dry purpura" (skin only). [3]

Q: A 23-year-old man with hemophilia is recently wheelchair bound. Which of the following best accounts for this development?

Hemarthrosis. Explanation: 1. Why Hemarthrosis is Correct: Hemophilia (Factor VIII or IX deficiency) is characterized by a bleeding diathesis, primarily affecting deep tissues. Hemarthrosis (bleeding into joint spaces) is the most common clinical manifestation, occurring in up to 80% of patients. Recurrent bleeding into the same joint (target joint) leads to Chronic Hemophilic Arthropathy [1]. This involves synovial hypertrophy, cartilage destruction, and joint fibrosis, eventually causing permanent deformity and loss of mobility [1]. In a young patient, this progression is the leading cause of becoming wheelchair-bound. The knee is the most commonly affected joint, followed by the elbow and ankle [1]. 2. Why Incorrect Options are Wrong: * Hematemesis (B) and Hematochezia (D): While gastrointestinal bleeding can occur in hemophilia, it usually presents as an acute emergency rather than a chronic condition leading to long-term physical disability or immobilization. * Hematocephalus (C): Intracranial hemorrhage is the most common cause of death in hemophiliacs, but it typically presents with acute neurological deficits or sudden mortality rather than progressive orthopedic impairment leading to wheelchair use. 3. Clinical Pearls for NEET-PG: * Most common joint involved: Knee joint [1]. * Earliest sign on X-ray: Soft tissue swelling. * Late X-ray findings: Subchondral cysts, narrowing of joint space, and "squared-off" patella (Jordan's sign). * Management: Acute bleeds require immediate factor replacement (aim for 40-50% levels). Prophylactic factor replacement is the gold standard to prevent arthropathy. * Note: Avoid NSAIDs (except COX-2 inhibitors) and intramuscular injections in these patients.

Q: JAK-2 mutation is strongly associated with which of the following conditions?

Polycythemia vera. **Explanation:** **JAK2 (Janus Kinase 2)** is a non-receptor tyrosine kinase involved in the signal transduction pathway of hematopoietic growth factor receptors (like erythropoietin and thrombopoietin). The **V617F mutation** leads to constitutive activation of this pathway, causing autonomous production of blood cells independent of growth factors. * **Polycythemia Vera (PV):** This is the correct answer because the JAK2 V617F mutation is found in **>95% of cases**. It is a major diagnostic criterion according to WHO classification. It is also found in Essential Thrombocythemia (ET) and Primary Myelofibrosis (PMF), but with lower frequency (~50-60%). **Why other options are incorrect:** * **Burkitt’s Lymphoma:** Characterized by the **t(8;14)** translocation involving the **c-myc** oncogene. * **Multiple Myeloma:** A plasma cell dyscrasia primarily associated with chromosomal abnormalities like trisomies or translocations involving the IgH locus (e.g., t(11;14), t(4;14)). * **Mantle Cell Lymphoma:** Defined by the **t(11;14)** translocation, leading to the overexpression of **Cyclin D1**. **High-Yield Clinical Pearls for NEET-PG:** 1. **JAK2 V617F:** Substitution of Valine (V) by Phenylalanine (F) at codon 617. 2. **PV Diagnosis:** Low serum Erythropoietin (EPO) levels + JAK2 mutation + Increased Red Cell Mass. 3. **Aquagenic Pruritus:** Itching after a hot bath is a classic clinical sign of PV. 4. **Treatment:** Ruxolitinib is a JAK1/2 inhibitor used in patients resistant to hydroxyurea.

Q: Platelet count is decreased in all of the following conditions except?

Henoch-Schönlein purpura. **Explanation:** The core concept tested here is the distinction between **quantitative** and **qualitative** platelet disorders. **1. Why Henoch-Schönlein Purpura (HSP) is the correct answer:** HSP is a **small-vessel vasculitis** mediated by IgA immune complex deposition. The hallmark of HSP is **palpable purpura** occurring in the presence of a **normal platelet count** [1]. The bleeding into the skin occurs because the blood vessel walls are inflamed and "leaky," not because platelets are deficient. Therefore, it is a vascular cause of purpura, not a thrombocytopenic one. **2. Analysis of Incorrect Options:** * **Idiopathic Thrombocytopenic Purpura (ITP):** Characterized by isolated thrombocytopenia due to anti-platelet antibodies (IgG) leading to premature destruction of platelets in the spleen [2]. * **Thrombotic Thrombocytopenic Purpura (TTP):** A pentad of symptoms (including microangiopathic hemolytic anemia and thrombocytopenia) caused by a deficiency of ADAMTS13, leading to extensive platelet-rich microthrombi that consume platelets [2]. * **Systemic Lupus Erythematosus (SLE):** An autoimmune condition where hematological abnormalities are common. Thrombocytopenia in SLE is usually immune-mediated (secondary ITP) or part of Evans syndrome [2]. **NEET-PG High-Yield Pearls:** * **HSP Tetrad:** Palpable purpura (buttocks/legs), Arthralgia, Abdominal pain (intussusception risk), and Renal involvement (IgA nephropathy). * **Platelet Count in Vasculitis:** Always remember that in most vasculitides (like HSP or Polyarteritis Nodosa), the platelet count is normal or even elevated (as an acute phase reactant) [1]. * **Rule of Thumb:** If the question mentions "palpable purpura," think Vasculitis (Normal Platelets). If it mentions "flat/non-palpable purpura/petechiae," think Thrombocytopenia (Low Platelets) [2].

Q: What is the earliest hematologic manifestation of megaloblastic anemia?

Hypersegmented polymorphs. **Explanation:** The earliest hematologic manifestation of megaloblastic anemia is the appearance of **hypersegmented neutrophils (polymorphs)** on the peripheral blood smear. **1. Why Hypersegmented Polymorphs are Correct:** Megaloblastic anemia results from impaired DNA synthesis (most commonly due to Vitamin B12 or Folate deficiency), while RNA and protein synthesis remain intact [1]. This leads to "nuclear-cytoplasmic asynchrony." In the bone marrow, granulocytic precursors are affected early. A neutrophil is considered hypersegmented if it has **$\geq$ 6 lobes** or if more than **5% of neutrophils have $ageq$ 5 lobes**. This change often precedes the development of macrocytosis and the drop in hemoglobin levels. **2. Analysis of Incorrect Options:** * **Increase in MCV (Macrocytosis):** While a hallmark of the disease, an increase in Mean Corpuscular Volume (MCV) typically occurs *after* the appearance of hypersegmented neutrophils. It is a sensitive indicator but not the earliest. * **Thrombocytopenia & Leukopenia:** These occur in later, more severe stages of the disease due to ineffective hematopoiesis affecting all cell lines (pancytopenia). They are never the initial manifestations. **3. High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Hypersegmented neutrophils. * **Earliest Bone Marrow Change:** Megaloblastic erythropoiesis (specifically, the presence of megaloblasts with "open" sieve-like chromatin). * **MCV in Megaloblastic Anemia:** Usually >110 fL. * **Biochemical Markers:** Elevated **Homocysteine** (seen in both B12 and Folate deficiency) and elevated **Methylmalonic Acid (MMA)** (specific to B12 deficiency). * **Ineffective Erythropoiesis:** Leads to increased indirect bilirubin and LDH (mimicking hemolysis).

Question 1

A young patient is hospitalized with petechiae of the oral mucous membrane, marginal gingival hemorrhage, and a platelet count of 45,000/cc. The bleeding time (BT) and clot retraction time are increased, while RBC and TLC are normal. What condition is the patient likely suffering from?

Accepted Answer

Thrombocytopenic purpura

Answer

Infectious mononucleosis

Answer

Leukemia

Answer

Hemophilia

Question 2

A 23-year-old man with hemophilia is recently wheelchair bound. Which of the following best accounts for this development?

Accepted Answer

Hemarthrosis

Answer

Hematemesis

Answer

Hematocephalus

Answer

Hematochezia

Question 3

A 60-year-old industrial worker presents with shortness of breath for the past week. Blood withdrawn shows a thick brownish-red color. What is the most likely diagnosis?

Accepted Answer

Methemoglobinemia

Answer

Sickle cell anemia

Answer

Hemolytic anemia

Answer

G6PD deficiency

Question 4

JAK-2 mutation is strongly associated with which of the following conditions?

Accepted Answer

Polycythemia vera

Answer

Burkitt's lymphoma

Answer

Multiple myeloma

Answer

Mantle cell lymphoma

Question 5

A 68-year-old patient developed atrophic gastritis and, 2 years later, developed a macrocytic, hyperchromic anemia. His anemia has most likely occurred due to which one of the following reasons?

Accepted Answer

The atrophic gastritis leads to vitamin B12 malabsorption.

Answer

The atrophic gastritis raises the pH in the duodenum, leading to folate malabsorption.

Answer

The terminal ileum is also involved, so iron is malabsorbed.

Answer

The atrophic gastritis leads to increased red blood cell absorption by the spleen.

Question 6

A 54-year-old man presents with minor fatigue on exertion for the past 9 months. Physical examination reveals no remarkable findings. Laboratory studies show hemoglobin of 11.7 g/dL, hematocrit of 34.8%, MCV of 73 mm3, platelet count of 315,000/mm3, and WBC count of 8035/mm3. Which of the following is the most sensitive and cost-effective test to help determine the cause of these findings?

Accepted Answer

Serum ferritin

Answer

Bone marrow biopsy

Answer

Hemoglobin electrophoresis

Answer

Serum haptoglobin

Question 7

Which of the following is NOT a feature of polycythemia rubra vera?

Accepted Answer

Low arterial oxygen saturation

Answer

Increased red cell mass

Answer

Presence of JAK2 mutation

Answer

Splenomegaly

Question 8

What is the most common cause of precipitation of renal failure in multiple myeloma?

Accepted Answer

Hypercalcemia

Answer

Hyperuricemia

Answer

Infection

Answer

Amyloidosis

Question 9

Platelet count is decreased in all of the following conditions except?

Accepted Answer

Henoch-Schönlein purpura

Answer

Idiopathic thrombocytopenic purpura

Answer

Thrombotic thrombocytopenic purpura

Answer

Systemic lupus erythematosus

Question 10

What is the earliest hematologic manifestation of megaloblastic anemia?

Accepted Answer

Hypersegmented polymorphs

Answer

Increase in MCV

Answer

Thrombocytopenia

Answer

Leukopenia

Hematology — MCQs

Hematology — MCQs

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