Hematology Practice Questions

Q: All of the following are features of hemolytic anemia, EXCEPT:

Increased ALT. **Explanation:** Hemolytic anemia is characterized by the premature destruction of red blood cells (RBCs). When RBCs rupture, their intracellular contents are released into the plasma, and the body’s metabolic pathways for processing heme are accelerated. **Why "Increased ALT" is the correct answer:** Alanine Aminotransferase (ALT) is a highly specific marker for **liver parenchyma**. Unlike other enzymes, ALT is present in very negligible amounts within red blood cells. Therefore, hemolysis does not significantly elevate serum ALT levels. If ALT is elevated, it typically points toward primary hepatic injury rather than a hematologic process [1]. **Analysis of incorrect options:** * **Increased LDH:** Lactate Dehydrogenase (specifically LDH-1 and LDH-2) is abundant in RBCs. It is a highly sensitive, though non-specific, marker of hemolysis. * **Increased AST:** Aspartate Aminotransferase (AST) is found in the liver, heart, and **skeletal muscle/RBCs**. In cases of significant hemolysis, AST levels rise alongside LDH. * **Increased Urobilinogen in stool:** Hemolysis leads to increased unconjugated bilirubin. This is processed by the liver [2] and excreted into the gut, where bacteria convert it into stercobilinogen (urobilinogen in stool). This causes the characteristic dark stools seen in hemolytic states. **High-Yield NEET-PG Pearls:** 1. **Best initial test for hemolysis:** Peripheral blood smear (look for schistocytes or spherocytes) and Reticulocyte count. 2. **Most specific marker for intravascular hemolysis:** Decreased **Haptoglobin** levels (as it binds free hemoglobin). 3. **Urine findings:** In intravascular hemolysis, you will see hemoglobinuria and hemosiderinuria, but **never** bilirubinuria (unconjugated bilirubin is water-insoluble) [2]. 4. **The LDH/AST ratio:** A high LDH with a mildly elevated AST and normal ALT is a classic biochemical "fingerprint" of hemolysis [1].

Q: Spontaneous mouth petechiae and gingival bleeding typically occur at which platelet level?

Between 20,000-30,000/mm3. The clinical manifestation of thrombocytopenia (low platelet count) is directly correlated with the degree of deficiency. The correct answer is **Option B (20,000–30,000/mm³)** because this range represents the critical threshold where the primary hemostatic mechanism fails to maintain capillary integrity under normal physiological stress [1]. * **Why Option B is correct:** While the normal platelet count is 150,000–450,000/mm³, surgical bleeding usually doesn't occur until levels fall below 50,000/mm³. However, **spontaneous** bleeding—manifesting as petechiae, ecchymosis, and mucosal bleeding (gingival/epistaxis)—typically emerges when the count drops below **20,000–30,000/mm³** [1], [2]. Below 10,000/mm³, the risk of life-threatening internal hemorrhage (e.g., intracranial) increases significantly. * **Why other options are incorrect:** * **Option A & C:** These ranges are either normal or represent very mild thrombocytopenia where patients remain entirely asymptomatic. * **Option D:** Counts above 70,000/mm³ are generally sufficient to prevent spontaneous bleeding and are even adequate for most minor surgical procedures. **High-Yield Clinical Pearls for NEET-PG:** 1. **First Sign:** Petechiae are the hallmark of primary hemostatic defects (platelet issues), whereas deep muscle hematomas and hemarthrosis suggest secondary hemostatic defects (clotting factor issues) [2]. 2. **Wet Purpura:** The presence of blood blisters in the mouth (bullae) is a sign of severe thrombocytopenia and a predictor of imminent intracranial hemorrhage [3]. 3. **Transfusion Threshold:** In stable patients without bleeding, prophylactic platelet transfusion is usually indicated when the count falls below **10,000/mm³**.

Q: Cryoprecipitate cannot be used in which of the following conditions?

Hemophilia B. **Explanation:** The correct answer is **Hemophilia B**. To understand why, we must look at the specific composition of Cryoprecipitate. **Why Hemophilia B is the correct answer:** Cryoprecipitate is a concentrated fraction of plasma obtained by thawing fresh frozen plasma (FFP) at 4°C. It contains only five specific factors: **Factor VIII, Von Willebrand Factor (vWF), Fibrinogen (Factor I), Factor XIII, and Fibronectin.** Hemophilia B is caused by a deficiency of **Factor IX** (Christmas factor) [4]. Since Cryoprecipitate does not contain Factor IX, it is ineffective for treating Hemophilia B. These patients require Factor IX concentrates or FFP [1]. **Analysis of incorrect options:** * **Von Willebrand Disease (vWD):** Cryoprecipitate contains high concentrations of vWF and was historically the mainstay of treatment before the availability of virus-inactivated concentrates. * **Hemophilia A:** It contains Factor VIII, making it an effective (though now secondary to recombinant factors) treatment for Factor VIII deficiency [2]. * **DIC:** In DIC, there is massive consumption of fibrinogen. Cryoprecipitate is the treatment of choice to rapidly replenish fibrinogen levels when they fall below 100 mg/dL [3]. **NEET-PG High-Yield Pearls:** * **Composition Mnemonic:** Remember **"1, 8, 13, and vWF"** (Factors I, VIII, XIII, and vWF). * **Fibrinogen Source:** Cryoprecipitate is the most concentrated source of fibrinogen available (approx. 200-250 mg per unit). * **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. * **Indication:** It is specifically indicated in **Hypofibrinogenemia** and **Uremic bleeding** (due to its effect on platelet adhesion via vWF).

Q: Which of the following conditions can result in dactylitis?

Sickle cell anemia. ### Explanation **Correct Answer: D. Sickle cell anemia** **Mechanism:** Dactylitis, also known as **Hand-Foot Syndrome**, is often the first clinical manifestation of Sickle Cell Anemia (SCA) in infants (typically aged 6 months to 2 years). It is caused by **vaso-occlusive crises** in the small bones of the hands and feet [1]. The rapid expansion of bone marrow in these small bones, combined with sluggish blood flow, leads to infarction of the bone marrow and cortical bone [1]. This triggers an inflammatory response, resulting in symmetrical, painful swelling of the dorsum of the hands and feet, often accompanied by low-grade fever. **Why other options are incorrect:** * **A & B (Hemophilia and Von Willebrand Disease):** These are primary bleeding disorders. While Hemophilia commonly causes **hemarthrosis** (bleeding into large joints like the knee), it does not cause vaso-occlusive infarction or dactylitis. * **C (Thalassemia):** While Thalassemia involves ineffective erythropoiesis and bone marrow expansion (leading to "chipmunk facies"), it does not involve the sickling phenomenon [2] or acute vaso-occlusion required to produce dactylitis. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** In the acute phase of dactylitis, X-rays are often normal. After 1–2 weeks, subperiosteal new bone formation or "moth-eaten" appearances may be seen. * **Differential Diagnosis:** The primary differential for dactylitis is **Osteomyelitis** (specifically *Salmonella* in SCA patients). However, dactylitis is usually bilateral and symmetrical, whereas osteomyelitis is typically focal. * **Other causes of dactylitis:** Beyond SCA, dactylitis is a hallmark of **Sero-negative Spondyloarthropathies** (e.g., Psoriatic arthritis—"Sausage digits"), Sarcoidosis, and Syphilis (clutton's joints). * **Management:** Treatment is supportive, involving aggressive hydration and analgesia [3].

Q: Which of the following is NOT true about Hemophilia A?

Prothrombin time (PT) is increased. **Explanation:** Hemophilia A is an X-linked recessive bleeding disorder caused by a deficiency or dysfunction of **Coagulation Factor VIII** [1]. To answer this question, one must understand the coagulation cascade and which laboratory tests evaluate specific pathways [2]. **Why Option B is the Correct Answer (The False Statement):** Prothrombin Time (PT) measures the **Extrinsic** and **Common pathways** (Factors VII, X, V, II, and I) [2]. Since Factor VIII is part of the **Intrinsic pathway**, its deficiency does not affect the PT. Therefore, PT remains **normal** in Hemophilia A [2]. **Analysis of Other Options:** * **Option A (Fibrinogen-to-thrombin time/Clotting dynamics):** While "FIT" is a less common term, in the context of hemophilia, any deficiency in the intrinsic pathway delays the generation of thrombin, which is essential for converting fibrinogen to fibrin. * **Option C (Clotting Time):** Clotting time is a global measure of the time required for blood to coagulate. In Hemophilia A, the defect in the intrinsic pathway significantly prolongs the clotting time. * **Option D (Factor VIII levels):** This is the hallmark of the disease [1]. Hemophilia A is defined by decreased serum levels of Factor VIII. **High-Yield Clinical Pearls for NEET-PG:** * **Lab Profile:** Prolonged aPTT (Activated Partial Thromboplastin Time) + Normal PT + Normal Bleeding Time + Normal Platelet Count [2]. * **Mixing Study:** If aPTT corrects after mixing the patient's plasma with normal plasma, it indicates a factor deficiency (like Hemophilia) [2]. If it does not correct, it suggests an inhibitor (like Lupus Anticoagulant). * **Clinical Presentation:** Characterized by deep tissue bleeding, **hemarthrosis** (bleeding into joints), and postsurgical bleeding. * **Treatment:** Recombinant Factor VIII concentrate; Desmopressin (DDAVP) can be used in mild cases to release stored Factor VIII from endothelial cells [3].

Q: A 39-year-old man with chronic alcoholism presents with a hemoglobin of 9.6 g/dL. His platelets and WBC are normal. Additional tests, including ferritin, vitamin B12, and folate levels, are also normal. Which of the following findings is most likely to be seen on his peripheral blood film?

Macrocytosis. The correct answer is **Macrocytosis (Option A)**. In a patient with chronic alcoholism and anemia, macrocytosis (increased Mean Corpuscular Volume or MCV) is the most common hematologic finding [1]. While macrocytosis is often associated with Vitamin B12 or Folate deficiency (megaloblastic anemia), it frequently occurs in alcoholics even when these levels are **normal** [1]. **The underlying mechanism:** Alcohol has a direct toxic effect on the bone marrow and interferes with erythrocyte membrane lipid metabolism, leading to an increased surface area-to-volume ratio. This results in "non-megaloblastic" macrocytosis, characterized by round macrocytes rather than the oval macrocytes seen in B12/Folate deficiency [2]. **Why other options are incorrect:** * **Basophilia (Option B):** Associated with myeloproliferative disorders (e.g., CML) or lead poisoning, not typically seen in chronic alcoholism. * **Red cell fragments (Option C):** These (schistocytes) are markers of microangiopathic hemolytic anemia (MAHA) or mechanical heart valve destruction, not alcohol toxicity. * **Increased platelet adhesiveness (Option D):** Alcohol actually **decreases** platelet aggregation and function, often leading to a mild bleeding tendency despite normal platelet counts. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of Macrocytosis:** Alcohol consumption (even in the absence of anemia) [1]. 2. **MCV in Alcoholism:** Usually ranges between 100–110 fL. 3. **Target Cells:** May also be seen in alcoholic liver disease due to increased cholesterol deposition in the RBC membrane. 4. **Sideroblastic Anemia:** Chronic alcohol use can also cause ringed sideroblasts in the bone marrow due to interference with heme synthesis [2].

Q: Thrombocytopenia is not a feature of which of the following conditions?

Henoch-Schonlein purpura. **Explanation:** The core concept tested here is the differentiation between **palpable purpura** (vasculitic) and **non-palpable purpura** (thrombocytopenic). **1. Why Henoch-Schonlein Purpura (HSP) is the correct answer:** HSP is an **IgA-mediated small-vessel vasculitis**. The skin lesions (purpura) are caused by inflammation of the blood vessel walls, leading to RBC extravasation into the skin. Crucially, the **platelet count in HSP is normal or even elevated** (as an acute-phase reactant). The hallmark clinical triad includes palpable purpura (usually on lower limbs/buttocks), arthritis, and abdominal pain. **2. Why the other options are incorrect:** * **Cavernous Angioma (Kasabach-Merritt Syndrome):** Large vascular tumors can sequester and destroy platelets (consumptive coagulopathy), leading to profound thrombocytopenia. * **Thrombotic Thrombocytopenic Purpura (TTP):** Characterized by the formation of microthrombi in small vessels. This consumes platelets, leading to severe thrombocytopenia (part of the classic pentad: Microangiopathic hemolytic anemia, Thrombocytopenia, Fever, Renal failure, and Neurological symptoms). * **Disseminated Intravascular Coagulation (DIC):** Involves systemic activation of the coagulation cascade, leading to the widespread consumption of both clotting factors and platelets. **High-Yield Clinical Pearls for NEET-PG:** * **HSP:** Most common vasculitis in children; often follows an Upper Respiratory Tract Infection (URTI). Renal involvement (IgA Nephropathy) determines long-term prognosis. * **Platelet Count:** Always check the platelet count in a child with purpura. If it's normal, think HSP; if low, think ITP, Leukemia, or DIC. * **Kasabach-Merritt Syndrome:** High-yield association between "Giant Hemangioma" and "Thrombocytopenia."

Question 1

What type of anemia is typically caused by pulmonary tuberculosis?

Accepted Answer

Anemia of chronic disease

Answer

Iron-deficiency anemia

Answer

Megaloblastic anemia

Answer

Sideroblastic anemia

Question 2

All of the following are features of hemolytic anemia, EXCEPT:

Accepted Answer

Increased ALT

Answer

Increased LDH

Answer

Increased AST

Answer

Increased urobilinogen in stool

Question 3

A 27-year-old woman complains of constant back pain. She recently had an episode of severe chest and back pain that required narcotic medications, blood transfusions, and fluids to treat. On examination, she is afebrile, with midthoracic tenderness on palpation. X-rays of the spine reveal periosteal reaction of the eighth thoracic vertebra. She has a chronic blood disorder where bone infarction can occur that may be difficult to distinguish from osteomyelitis. For the above patient with a hemoglobin abnormality, select the most likely diagnosis.

Accepted Answer

sickle cell disease

Answer

beta-thalassemia major

Answer

HbH disease

Answer

HbC disease

Question 4

Spontaneous mouth petechiae and gingival bleeding typically occur at which platelet level?

Accepted Answer

Between 20,000-30,000/mm3

Answer

Between 300,000 - 500,000/mm3

Answer

Between 150,000-170,000/mm3

Answer

Between 70,000-185,000/mm3

Question 5

Cryoprecipitate cannot be used in which of the following conditions?

Accepted Answer

Hemophilia B

Answer

Von Willebrand disease

Answer

Hemophilia A

Answer

Disseminated Intravascular Coagulation (DIC)

Question 6

Which of the following conditions can result in dactylitis?

Accepted Answer

Sickle cell anemia

Answer

Hemophilia

Answer

Von Willebrand disease

Answer

Thalassemia

Question 7

An 18-year-old man develops excessive bleeding 2 hours after wisdom tooth extraction. He has a history of easy bruising after playing sports, and of minor cuts that rebleed. His examination is normal, except for the tooth extraction site, which is still oozing blood. His hemoglobin is 14.8 g/dL, platelets 230,000 mL, PT is normal, and partial thromboplastin time (PTT) is elevated. A bleeding time is normal, factor VIII level is reduced, factor IX is normal, and ristocetin cofactor assay is normal. For the above patient with a bleeding disorder, select the most likely diagnosis?

Accepted Answer

hemophilia A

Answer

von Willebrand disease

Answer

hemophilia B

Answer

thrombotic thrombocytopenic purpura (TTP)

Question 8

Which of the following is NOT true about Hemophilia A?

Accepted Answer

Prothrombin time (PT) is increased

Answer

Fibrinogen-to-thrombin time (FIT) is increased

Answer

Clotting time is increased

Answer

Serum levels of Factor VIII are decreased

Question 9

A 39-year-old man with chronic alcoholism presents with a hemoglobin of 9.6 g/dL. His platelets and WBC are normal. Additional tests, including ferritin, vitamin B12, and folate levels, are also normal. Which of the following findings is most likely to be seen on his peripheral blood film?

Accepted Answer

Macrocytosis

Answer

Basophilia

Answer

Red cell fragments

Answer

Increased platelet adhesiveness

Question 10

Thrombocytopenia is not a feature of which of the following conditions?

Accepted Answer

Henoch-Schonlein purpura

Answer

Cavernous angioma

Answer

Thrombotic thrombocytopenic purpura

Answer

Disseminated Intravascular Coagulation

Hematology — MCQs

Hematology — MCQs

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