Hematology Practice Questions

Q: A 26-year-old woman presents with weakness, dyspnea, and palpitations. Examination reveals severe pallor. She recently experienced a viral infection. Liver function tests show elevated bilirubin levels. Ultrasound reveals splenomegaly and gallstones. Her mother, who is standing nearby, also appears pale and has splenomegaly. What is the probable diagnosis?

Hereditary spherocytosis. **Explanation:** The clinical presentation points toward **Hereditary Spherocytosis (HS)**, an autosomal dominant disorder caused by defects in red blood cell (RBC) membrane proteins (most commonly **Ankyrin**, followed by Spectrin) [1]. **Why Option B is correct:** 1. **Hemolytic Anemia:** Weakness, pallor, and elevated bilirubin indicate hemolysis [1]. 2. **Triad:** The classic triad of HS is **anemia, jaundice, and splenomegaly**. 3. **Complications:** Chronic hemolysis leads to increased bilirubin excretion, resulting in **pigment gallstones** (cholelithiasis), even in young patients. 4. **Family History:** The mother’s similar symptoms suggest an autosomal dominant inheritance pattern. 5. **Trigger:** Viral infections (like Parvovirus B19) can trigger "aplastic crises" or "hemolytic crises," worsening the symptoms. **Why other options are incorrect:** * **A. Gilbert’s Syndrome:** Causes isolated indirect hyperbilirubinemia without anemia, splenomegaly, or gallstones. * **C. G6PD Deficiency:** An X-linked recessive disorder (rare in females) characterized by episodic hemolysis triggered by oxidative stress (drugs/fava beans) [2]. It does not typically cause chronic splenomegaly. * **D. Paroxysmal Nocturnal Hemoglobinuria (PNH):** An acquired stem cell defect presenting with intravascular hemolysis and venous thrombosis; it lacks a strong family history. **NEET-PG High-Yield Pearls:** * **Gold Standard Test:** Eosin-5-maleimide (EMA) binding test via flow cytometry. * **Screening Test:** Osmotic Fragility Test (increased fragility). * **Peripheral Smear:** Spherocytes (small, dark RBCs lacking central pallor) and increased MCHC (>36 g/dL) [1]. * **Treatment of Choice:** Splenectomy (usually deferred until after age 6 to reduce sepsis risk) [1].

Q: All are TRUE about paroxysmal cold hemoglobinuria (PCH), EXCEPT:

Lysis of red blood cells occurs at low temperatures. Explanation: Paroxysmal Cold Hemoglobinuria (PCH) is a rare form of autoimmune hemolytic anemia characterized by the presence of the **Donath-Landsteiner antibody**, a biphasic IgG autoantibody directed against the P-antigen on red blood cells (RBCs). **Why Option D is the Correct Answer (The False Statement):** The hallmark of PCH is its **biphasic** nature. The Donath-Landsteiner antibodies bind to RBCs only at **low temperatures** (cold phase), but the actual **lysis (complement-mediated hemolysis) occurs at 37°C** (warm phase) when the blood recirculates to the body's core. Therefore, stating that lysis occurs at low temperatures is physiologically incorrect. **Analysis of Other Options:** * **Option A:** PCH is most commonly seen in **children**, often following a viral (e.g., Measles, Mumps, EBV) or upper respiratory infection. * **Option B:** In its acute form (post-viral), PCH is typically **self-limited**, resolving within a few days to weeks once the inciting infection clears. * **Option C:** The **Donath-Landsteiner antibody** is the pathognomonic finding. It is an IgG antibody that fixes complement (C3) in the cold [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Antibody Type:** IgG (unlike Cold Agglutinin Disease, which is typically IgM) [1]. * **Specificity:** Anti-P antibody. * **Direct Antiglobulin Test (DAT):** Usually positive for **C3** only; negative for IgG (as the antibody dissociates at warmer temperatures) [1]. * **Historical Context:** Historically associated with late-stage syphilis; currently most common in pediatric post-viral settings. * **Clinical Presentation:** Sudden onset of dark "cola-colored" urine (hemoglobinuria) after cold exposure, accompanied by fever and chills.

Q: A patient receiving low molecular weight heparin (LMWH) suddenly develops hemorrhage. What is the next step in management?

Level of Factor Xa activity. The correct management for monitoring or assessing complications of **Low Molecular Weight Heparin (LMWH)** is the measurement of **Factor Xa activity**. [1] **1. Why Factor Xa activity is correct:** LMWH (e.g., Enoxaparin) acts primarily by inhibiting Factor Xa rather than Thrombin (Factor IIa), with a ratio of approximately 3:1 to 4:1. [1] Unlike Unfractionated Heparin (UFH), LMWH has a predictable pharmacokinetic profile and usually does not require routine monitoring. [4] However, in specific scenarios—such as **active hemorrhage**, renal failure, pregnancy, or extreme obesity—monitoring is essential. Since LMWH does not significantly prolong global coagulation tests, the **anti-Xa assay** is the only reliable method to quantify its anticoagulant effect. **2. Why other options are incorrect:** * **APTT (Option B):** This is the standard test for monitoring **Unfractionated Heparin (UFH)**. [3], [4] LMWH molecules are too short to bridge antithrombin to thrombin effectively, resulting in minimal to no change in APTT even at therapeutic doses. * **Platelet Count (Option C):** While used to screen for Heparin-Induced Thrombocytopenia (HIT), it does not measure the anticoagulant intensity or explain an acute hemorrhage caused by drug overdose. * **Prothrombin Time (Option D):** PT/INR is used to monitor Warfarin (extrinsic pathway) [2] and is not affected by LMWH. **Clinical Pearls for NEET-PG:** * **Antidote:** Protamine sulfate only partially neutralizes LMWH (approx. 60-75%), whereas it completely reverses UFH. * **Renal Clearance:** LMWH is renally excreted; thus, it is contraindicated in patients with ESRD (CrCl <30 ml/min). UFH is preferred in such cases. * **Monitoring:** Routine monitoring is NOT required for LMWH, unlike UFH. Anti-Xa levels should be drawn 4 hours after the dose (peak level). [4]

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].

Question 1

A 26-year-old woman presents with weakness, dyspnea, and palpitations. Examination reveals severe pallor. She recently experienced a viral infection. Liver function tests show elevated bilirubin levels. Ultrasound reveals splenomegaly and gallstones. Her mother, who is standing nearby, also appears pale and has splenomegaly. What is the probable diagnosis?

Accepted Answer

Hereditary spherocytosis

Answer

Gilbert's syndrome

Answer

G6PD deficiency

Answer

Paroxysmal nocturnal hemoglobinuria

Question 2

All are TRUE about paroxysmal cold hemoglobinuria (PCH), EXCEPT:

Accepted Answer

Lysis of red blood cells occurs at low temperatures

Answer

It occurs mostly in children

Answer

It is self-limited

Answer

Donath-Landsteiner antibody is present

Question 3

A patient receiving low molecular weight heparin (LMWH) suddenly develops hemorrhage. What is the next step in management?

Accepted Answer

Level of Factor Xa activity

Answer

Activated partial thromboplastin time (APTT)

Answer

Platelet count

Answer

Prothrombin time (PT)

Question 4

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 5

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 6

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 7

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 8

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 9

Which of the following conditions can result in dactylitis?

Accepted Answer

Sickle cell anemia

Answer

Hemophilia

Answer

Von Willebrand disease

Answer

Thalassemia

Question 10

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)

Hematology — MCQs

Hematology — MCQs

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