Hematopathology Practice Questions

Q: Which of the following statements is incorrect regarding Hemophilia A?

APTT is decreased. ### Explanation **1. Why Option A is the Correct (Incorrect Statement):** Hemophilia A is a deficiency of **Factor VIII**, which is a key component of the **intrinsic pathway** of the coagulation cascade. In clinical practice, the **Activated Partial Thromboplastin Time (APTT)** measures the integrity of the intrinsic and common pathways [4]. Therefore, a deficiency in Factor VIII leads to a **prolonged (increased) APTT**, not a decreased one [4]. Bleeding time and PT (Prothrombin Time) remain normal in isolated Hemophilia A. **2. Analysis of Other Options:** * **Option B (Factor VIII is decreased):** This is the hallmark of Hemophilia A (an X-linked recessive disorder) [1]. * **Option C (Factor IX is normal):** Factor IX deficiency characterizes Hemophilia B (Christmas Disease). In Hemophilia A, Factor IX levels are unaffected [2]. * **Option D (VWF is normal):** While Factor VIII circulates bound to Von Willebrand Factor (VWF), Hemophilia A is a primary genetic defect of Factor VIII itself. VWF levels and function (Ristocetin cofactor activity) are normal, which helps distinguish it from Von Willebrand Disease (VWD) [5]. **3. NEET-PG High-Yield Clinical Pearls:** * **Inheritance:** X-linked recessive (affects males; females are typically asymptomatic carriers) [1]. * **Clinical Presentation:** Characterized by deep tissue bleeding, **hemarthrosis** (bleeding into joints, most commonly the knee), and delayed postsurgical bleeding [3]. * **Mixing Study:** If APTT is prolonged, a mixing study is performed. If the APTT **corrects** with normal plasma, it confirms a factor deficiency (like Hemophilia) [4]. If it does not correct, an inhibitor (antibody) is present. * **Treatment:** Recombinant Factor VIII concentrate. Desmopressin (DDAVP) can be used in mild cases to release stored Factor VIII from endothelial cells [2].

Q: SAG M is an abbreviation for which of the following formulations?

Sodium citrate, Adenine, Glucose anhydrate, Mannitol. **Explanation:** **SAGM** is a specialized additive solution used in blood banking to extend the shelf life of packed Red Blood Cells (RBCs) after the plasma has been removed. 1. **Why Option B is Correct:** The abbreviation stands for **S**odium citrate, **A**denine, **G**lucose anhydrate, and **M**annitol. Each component serves a specific physiological purpose: * **Sodium citrate:** Acts as an anticoagulant and buffer [1]. * **Adenine:** Maintains high levels of ATP, ensuring the survival of RBCs. * **Glucose (Dextrose):** Provides the substrate for glycolysis to maintain cell metabolism. * **Mannitol:** Acts as an osmotic stabilizer to prevent hemolysis and protect the RBC membrane. 2. **Analysis of Incorrect Options:** * **Option A & D:** These list **Sodium chloride**. While saline is often the base of additive solutions, the "S" in the standardized SAGM nomenclature specifically refers to the citrate component used in the initial collection and stabilization. * **Option C:** Lists **Adenosine**. This is incorrect; **Adenine** is the specific nucleobase required for ATP synthesis in stored erythrocytes. * **Option D:** Lists **Gelatin**, which is a plasma expander and has no role in the metabolic preservation of stored blood. 3. **Clinical Pearls for NEET-PG:** * **Shelf Life:** The addition of SAGM extends the storage life of RBCs to **42 days** (compared to 35 days with CPDA-1). * **Storage Temperature:** Blood with SAGM is stored at **2°C to 6°C**. * **Hematocrit:** SAGM units typically have a lower hematocrit (approx. 50-70%) compared to CPDA-1 units because the additive solution makes the blood less viscous and easier to infuse.

Q: Which of the following features may be used to differentiate hemophilia A from von Willebrand disease?

Bleeding time. To differentiate between Hemophilia A and von Willebrand Disease (vWD), one must distinguish between a **coagulation factor deficiency** and a **platelet adhesion defect**. [1] ### **Why Bleeding Time is the Correct Answer** * **Bleeding Time (BT)** measures primary hemostasis (platelet plug formation). * In **vWD**, von Willebrand Factor is deficient or defective. Since vWF is essential for anchoring platelets to the subendothelium, the BT is **prolonged**. [2] * In **Hemophilia A**, the defect is strictly in the coagulation cascade (secondary hemostasis). Platelet function is normal; therefore, the BT is **normal**. ### **Why Other Options are Incorrect** * **B. Prothrombin Time (PT):** PT measures the extrinsic and common pathways (Factors VII, X, V, II, I). Both Hemophilia A and vWD involve the intrinsic pathway, so PT is **normal in both**. [1] * **C. Partial Thromboplastin Time (aPTT):** aPTT measures the intrinsic pathway. Since Factor VIII activity is reduced in both Hemophilia A and vWD (vWF stabilizes Factor VIII), the aPTT can be **prolonged in both**. [1][2] * **D. Factor VIII levels:** Factor VIII levels are decreased in Hemophilia A (primary deficiency) and often decreased in vWD (secondary to low vWF). Thus, it cannot reliably differentiate the two without further testing (like vWF Ag or Ristocetin cofactor assay). [2] ### **NEET-PG High-Yield Pearls** * **Inheritance:** Hemophilia A is **X-linked recessive** (mostly males); vWD is **Autosomal Dominant** (most common inherited bleeding disorder). * **Clinical Presentation:** Hemophilia presents with deep tissue bleeds and **hemarthrosis**. vWD presents with **mucocutaneous bleeding** (epistaxis, menorrhagia). [3] * **Ristocetin Cofactor Assay:** The gold standard for diagnosing vWD (measures vWF-induced platelet agglutination). [2] * **Mixing Study:** Both will show correction of aPTT when mixed with normal plasma (indicating a deficiency, not an inhibitor). [1]

Q: A 23-year-old male presents with fever and cervical lymphadenopathy. The peripheral smear shows a specific finding. What is the most likely diagnosis?

Infectious mononucleosis. ***Infectious mononucleosis*** - The "specific finding" on peripheral smear refers to **atypical lymphocytes (Downey cells)**, which are characteristic of **EBV infection** in young adults. - Classic presentation of **fever** and **cervical lymphadenopathy** in a young male strongly suggests **infectious mononucleosis**. *Acute Myeloid Leukemia (AML)* - Would show **blast cells** (>20% myeloblasts) on peripheral smear, not atypical lymphocytes. - Typically presents with **pancytopenia**, **bleeding**, and **bone marrow failure** rather than isolated lymphadenopathy. *Acute Lymphoblastic Leukemia (ALL)* - Characterized by **lymphoblasts** on peripheral smear, which are immature cells with high nuclear-to-cytoplasmic ratio. - More common in **children** and presents with **bone marrow failure symptoms** like fatigue, bleeding, and infections. *None of the above* - The clinical scenario of a **young adult** with **fever**, **cervical lymphadenopathy**, and **atypical lymphocytes** is classic for infectious mononucleosis. - **EBV-induced atypical lymphocytes** are the pathognomonic finding that confirms the diagnosis.

Q: All the following conditions cause thrombocytopenia except?

Iron deficiency anemia. **Explanation:** The correct answer is **Iron deficiency anemia (IDA)** because it is typically associated with **reactive thrombocytosis** (an increase in platelet count) rather than thrombocytopenia. This occurs because erythropoietin, which is elevated in IDA, has a structural similarity to thrombopoietin, leading to cross-stimulation of megakaryocytes. **Analysis of Options:** * **Iron deficiency anemia (Option D):** In most cases, IDA presents with a normal or elevated platelet count. Thrombocytopenia is extremely rare in IDA and only occurs in cases of severe, long-standing nutritional depletion. * **Giant hemangioma (Option A):** This refers to **Kasabach-Merritt Syndrome**, where platelets are sequestered and consumed within the vascular channels of a large hemangioma, leading to consumptive thrombocytopenia [2]. * **Infectious mononucleosis (Option B):** Caused by the Epstein-Barr virus (EBV), it can cause thrombocytopenia through immune-mediated destruction (anti-platelet antibodies) or transient bone marrow suppression. * **HIV infection (Option C):** Thrombocytopenia is a common hematological manifestation of HIV [1]. It occurs via multiple mechanisms: direct infection of megakaryocytes, immune-mediated destruction (ITP-like picture), and hypersplenism [1]. **NEET-PG High-Yield Pearls:** 1. **Kasabach-Merritt Syndrome:** Triad of Giant Hemangioma + Thrombocytopenia + Consumptive Coagulopathy. 2. **Reactive Thrombocytosis:** Common causes include IDA, acute hemorrhage, inflammation, and post-splenectomy. 3. **HIV & Platelets:** Thrombocytopenia can be the initial presenting sign of an undiagnosed HIV infection. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 665-667. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 619-621.

Question 1

Which of the following is an immune response cause of anemia?

Accepted Answer

Hemolytic disease of the newborn

Answer

Diamond Blackfan anemia

Answer

Hereditary spherocytosis

Answer

Glucose-6-phosphate dehydrogenase deficiency

Question 2

Which of the following statements is incorrect regarding Hemophilia A?

Accepted Answer

APTT is decreased

Answer

Factor VIII is decreased

Answer

Factor IX is normal

Answer

Von Willebrand Factor (VWF) is normal

Question 3

Alkaline phosphatase is specific to which of the following cells?

Accepted Answer

Neutrophils

Answer

Eosinophils

Answer

Polymorphs

Answer

Basophils

Question 4

SAG M is an abbreviation for which of the following formulations?

Accepted Answer

Sodium citrate, Adenine, Glucose anhydrate, Mannitol

Answer

Sodium chloride, Adenine, Glucose anhydrate, Mannitol

Answer

Sodium citrate, Adenosine, Glucose anhydrate, Mannitol

Answer

Sodium chloride, Adenine, Gelatin, Mannitol

Question 5

A 50-year-old man presents with a pruritic rash of several years' duration, characterized by erythematous, eczematoid patches and raised plaques distributed asymmetrically over the chest and abdomen. Biopsy reveals atypical CD4+ T cells with cerebriform nuclei. Further marker studies confirm a diagnosis of mycosis fungoides. Which of the following is true of this disease?

Accepted Answer

The disease eventually disseminates to lymph nodes and internal organs.

Answer

The neoplastic cells most commonly display cell markers of CD19 and CD20.

Answer

The skin rash most commonly disappears over time.

Answer

This disease is caused by a chronic fungal infection in the skin.

Question 6

Which of the following features may be used to differentiate hemophilia A from von Willebrand disease?

Accepted Answer

Bleeding time

Answer

Prothrombin time

Answer

Partial thromboplastin time

Answer

Factor VIII levels

Question 7

A 30-year-old male presents with cervical lymphadenopathy for 2 months. There is no past history of TB or TB contact. On examination, two lymph nodes measuring 1x1 cm are palpable, rubbery in consistency without matting. Histopathological biopsy findings were noted (image not provided, assume characteristic findings for the diagnosis). Based on the clinical presentation and likely histopathological findings, what is the most likely diagnosis among the subtypes of Hodgkin's lymphoma?

Accepted Answer

Nodular lymphocyte predominant Hodgkin's lymphoma

Answer

Mixed cellularity Hodgkin's lymphoma

Answer

Lymphocyte depleted Hodgkin's lymphoma

Answer

Nodular sclerosis Hodgkin's lymphoma

Question 8

A 23-year-old male presents with fever and cervical lymphadenopathy. The peripheral smear shows a specific finding. What is the most likely diagnosis?

Accepted Answer

Infectious mononucleosis

Answer

Acute Myeloid Leukemia (AML)

Answer

Acute Lymphoblastic Leukemia (ALL)

Answer

None of the above

Question 9

Leucopenia is not seen in which of the following conditions?

Accepted Answer

Pyogenic bacterial infection

Answer

Viral infection

Answer

Malnutrition

Answer

Enteric fever

Question 10

All the following conditions cause thrombocytopenia except?

Accepted Answer

Iron deficiency anemia

Answer

Giant hemangioma

Answer

Infectious mononucleosis

Answer

HIV infection

Hematopathology — MCQs

Hematopathology — MCQs

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