Hematology Practice Questions

Q: A 22-year-old man presents to the emergency department with dyspnea, palpitations, and a headache, which developed shortly after taking trimethoprim-sulfamethoxazole for a urinary tract infection. Laboratory studies reveal a normochromic, normocytic anemia, and a peripheral blood smear shows Heinz bodies. Which of the following is the most likely cause of this patient's anemia?

Glucose-6-phosphate dehydrogenase deficiency. ***Glucose-6-phosphate dehydrogenase deficiency*** - The patient's symptoms (dyspnea, palpitations, headache) along with **normochromic, normocytic anemia** and the presence of **Heinz bodies** after taking **trimethoprim-sulfamethoxazole** are highly indicative of **hemolytic anemia** due to G6PD deficiency [1], [2]. - Trimethoprim-sulfamethoxazole is an **oxidative stressor** that can trigger hemolysis in individuals with G6PD deficiency, as they cannot produce sufficient **NADPH** to protect red blood cells from oxidative damage [1]. *Lead poisoning* - Lead poisoning typically causes a **microcytic, hypochromic anemia** and is associated with **basophilic stippling** on a peripheral blood smear, not Heinz bodies. - Symptoms usually include **abdominal pain**, **neuropathy**, and **cognitive deficits**, which are not clearly described here. *Folate deficiency* - Folate deficiency leads to a **macrocytic, megaloblastic anemia**, characterized by **hypersegmented neutrophils** and large red blood cells. - It would not typically present with Heinz bodies or be exacerbated by trimethoprim-sulfamethoxazole in this manner. *Hereditary spherocytosis* - This condition is characterized by **spherocytes** on the peripheral smear and increased osmotic fragility, often leading to chronic hemolytic anemia. - While it causes hemolytic anemia, the presence of **Heinz bodies** specifically after an oxidative stressor (like trimethoprim-sulfamethoxazole) points more strongly to G6PD deficiency [2].

Q: All of the following are causes of microcytic hypochromic anemia except:

Fanconi's anemia. ***Fanconi anaemia*** - Fanconi anemia is a type of **aplastic anemia** caused by bone marrow failure, which does not typically result in **microcytic hypochromic anemia**. - The anemia in Fanconi's is usually **normocytic** due to inadequate production of red blood cells rather than defective hemoglobin production. *Iron deficiency* - Iron deficiency anemia is the most common cause of **microcytic hypochromic anemia**, characterized by decreased **iron stores** affecting hemoglobin synthesis [1]. - Common clinical features include **fatigue**, **pallor**, and **koilonychia** (spoon nails). *Lead poisoning* - Lead poisoning leads to microcytic hypochromic anemia by causing **inhibition of heme synthesis**, resulting in the accumulation of **protoporphyrin**. - Alongside anemia, symptoms may include **abdominal pain** and **neurological dysfunction**. *Thalassemia* - Thalassemia is a genetic disorder that also causes **microcytic hypochromic anemia** due to inadequate formation of **alpha or beta globin chains**. - Patients often present with **chronic anemia** and **splenomegaly** due to hemolysis.

Q: What is the treatment for chemotherapy-induced agranulocytopenia?

Granulocyte colony-stimulating factor (G-CSF). ***Granulocyte colony-stimulating factor (G-CSF)*** - **G-CSF** directly stimulates the production and maturation of **granulocytes** (including neutrophils) in the bone marrow, - This helps to **increase neutrophil counts** and shorten the duration of **chemotherapy-induced agranulocytopenia**, reducing the risk of infection. *Packed red blood cells* - **Packed red blood cells (PRBCs)** are used to treat **anemia**, not agranulocytopenia. - They increase **hemoglobin** levels but have no effect on neutrophil count. *Platelet transfusion* - **Platelet transfusions** are administered to treat **thrombocytopenia** (low platelet count) and prevent bleeding. - They do not address the low neutrophil count seen in **agranulocytopenia**. *Granulocyte-macrophage colony-stimulating factor (GM-CSF), less commonly used.* - **GM-CSF** stimulates the production of both **granulocytes** and **macrophages**. - While it can increase neutrophil counts, **G-CSF** is generally preferred due to its more specific action and lower incidence of side effects for neutropenia.

Q: Plummer-Vinson syndrome is characterized by all of the following except:

Megaloblastic anemia. ***Megaloblastic anemia*** - Plummer-Vinson syndrome is associated with **iron deficiency anemia**, not megaloblastic anemia [2]. - **Megaloblastic anemia** is caused by deficiencies in **vitamin B12** or **folate**, leading to impairment in DNA synthesis [1]. *Glossitis* - **Glossitis**, or inflammation of the tongue, is a common symptom of Plummer-Vinson syndrome due to **iron deficiency**. - This symptom can contribute to the difficulty in swallowing experienced by patients. *Iron deficiency anemia* - **Iron deficiency anemia** is a primary characteristic of Plummer-Vinson syndrome, leading to various symptoms [2]. - The anemia is thought to contribute to the formation of esophageal webs which cause dysphagia. *Dysphagia* - **Dysphagia**, or difficulty swallowing, is a hallmark symptom of Plummer-Vinson syndrome, usually caused by **esophageal webs**. - These webs are thin mucosal folds that form in the upper esophagus, obstructing **food passage**.

Q: Hemolytic anemia may be characterized by all of the following except which of the following?

Increased plasma haptoglobin level. ***Increased plasma haptoglobin level*** - **Haptoglobin** binds to free hemoglobin released during **hemolysis** and is then cleared from the circulation [1]. Therefore, in hemolytic anemia, the plasma haptoglobin level would be **decreased**, not increased. - An increased haptoglobin level typically indicates an **inflammatory response** or is observed in conditions without significant intravascular hemolysis. *Hyperbilirubinemia* - **Increased breakdown of red blood cells** releases large amounts of **heme**, which is metabolized into **unconjugated bilirubin** [2]. - This leads to an overload of the liver's capacity to conjugate bilirubin, resulting in **unconjugated hyperbilirubinemia** [2]. *Reticulocytosis* - The body responds to the loss of red blood cells through hemolysis by **increasing production of new red blood cells** in the bone marrow. - This increased production leads to a higher-than-normal percentage of immature red blood cells, known as **reticulocytes**, in the peripheral blood. *Hemoglobinuria* - When **intravascular hemolysis** occurs, free hemoglobin is released into the bloodstream and exceeds the binding capacity of haptoglobin [1]. - This excess unbound hemoglobin is filtered by the kidneys and excreted in the urine, leading to **dark-colored urine** due to hemoglobin.

Q: Which of the following is more likely associated with a platelet disorder rather than hemophilia A?

Epistaxis. ***Epistaxis*** - **Epistaxis**, or nosebleeds, is commonly associated with **platelet disorders** due to poor **platelet function** or **thrombocytopenia** [1]. - It occurs due to **vascular fragility** and inadequate platelet response, unlike hemophilia A, which primarily affects coagulation factors [1]. *Late rebleeding* - **Late rebleeding** is more characteristic of **coagulation disorders** like hemophilia A, where hemophilic patients may experience delayed bleeding after injury. - It results from factors' prolonged activity rather than intrinsic platelet dysfunction. *Hemarthrosis* - **Hemarthrosis** (bleeding into joints) is a classic manifestation of hemophilia A, specifically due to deficiencies in **coagulation factors** [1]. - This is not typical for platelet disorders, which do not significantly affect joints [1]. *Prolonged partial thromboplastin time* - A **prolonged partial thromboplastin time (PTT)** is indicative of deficiencies in intrinsic pathway factors, which is more aligned with hemophilia rather than platelet disorders. - Platelet disorders typically do not affect PTT but may prolong bleeding time due to poor platelet function [2].

Q: Which of the following is a potential complication of blood transfusion?

Hyperkalemia. ***Hyperkalemia*** - Stored red blood cells can release **intracellular potassium** into the storage solution, leading to elevated potassium levels in transfused blood. - Rapid or massive transfusions deliver a significant potassium load, potentially causing **cardiac arrhythmias**. *Hyponatremia* - This is generally not a direct complication of blood transfusions; instead, blood products themselves contain electrolytes, and massive transfusion can disrupt electrolyte balance, but usually not to cause hyponatremia. - Volume overload from transfusion could dilute existing electrolytes, but most commonly, other electrolyte imbalances such as hyperkalemia or hypocalcemia occur. *Hypercalcemia* - Often, the opposite, **hypocalcemia**, is a complication of massive transfusion due to **citrate toxicity**. - Citrate, an anticoagulant in transfused blood, chelates calcium, reducing free calcium levels in the recipient. *Increased serum albumin* - Blood transfusions primarily administer **red blood cells**, plasma, or platelets, not typically albumin in amounts that would significantly increase serum albumin levels in the absence of an albumin-specific infusion [1]. - Low albumin (hypoalbuminemia) is a common finding in critically ill patients, and a blood transfusion usually doesn't correct this unless plasma or albumin is specifically administered [1].

Q: A 15-year-old boy suffering from Hodgkin's disease with lymph node involvement. Which treatment option is likely to have a high success rate?

Chemotherapy. ***Chemotherapy*** - **Hodgkin's disease** (lymphoma) is a systemic malignancy, and chemotherapy is the cornerstone of treatment, especially for widespread disease like lymph node involvement [1]. - Combination chemotherapy regimens, such as **ABVD** (Adriamycin, Bleomycin, Vinblastine, Dacarbazine), achieve high cure rates in pediatric Hodgkin's lymphoma. *Surgical resection of lymph nodes* - Surgical resection is generally **not curative** for Hodgkin's disease because it is a systemic malignancy, meaning cancer cells can be present in other lymph nodes or organs not visible [1]. - It might be used for **biopsy** or to debulk very large masses causing symptoms, but not as primary curative therapy [1]. *Targeted immunotherapy* - While immunotherapy agents like **Brentuximab vedotin** are used in Hodgkin's lymphoma, they are typically reserved for **relapsed/refractory disease** or in specific high-risk settings, not usually as first-line monotherapy. - Traditional chemotherapy remains the primary curative approach for initial presentation with lymph node involvement [1]. *Surgery combined with immunotherapy* - This combination is **not the standard primary treatment** for Hodgkin's lymphoma with lymph node involvement. - Surgery has a limited role, and while immunotherapy has a role, it's often in conjunction with chemotherapy or for specific cases, not typically as the initial combined approach with surgery.

Q: All-trans-retinoic acid is used in the treatment of:

Acute promyelocytic leukemia (APL). ***Acute promyelocytic leukemia (APL)*** - **All-trans-retinoic acid (ATRA)** is a cornerstone of APL treatment, targeting the specific **PML-RARα fusion protein** responsible for the disease [1]. - ATRA induces the differentiation of immature promyelocytes into mature granulocytes, thereby resolving the **leukemic block** in differentiation [1]. *Acute lymphoblastic leukemia (ALL)* - While ALL involves immature lymphocytes, ANTRA has no significant role in its treatment, which typically involves **multi-agent chemotherapy**, **corticosteroids**, and sometimes **targeted therapies** like tyrosine kinase inhibitors (for Ph+ ALL) [1]. - The mechanism of action of ATRA is specific to the myeloid lineage and the **PML-RARα fusion** [1]. *Chronic myeloid leukemia (CML)* - CML is characterized by the **BCR-ABL1 fusion gene** and is primarily treated with **tyrosine kinase inhibitors (TKIs)** like imatinib, nilotinib, or dasatinib. - ATRA does not target the molecular pathogenesis of CML and is not used in its standard treatment. *Transient myeloproliferative disorder (TMD)* - TMD, also known as transient abnormal myelopoiesis, is a myeloproliferative disorder seen in infants with **Down syndrome** and usually resolves spontaneously. - While it has myeloid features, ATRA is not a standard treatment; management is often **supportive** or involves low-dose chemotherapy if severe.

Q: A female with recurrent abortion and isolated prolonged activated partial thromboplastin time (APTT) is most likely associated with.

Lupus anticoagulant. ***Lupus anticoagulant*** - **Lupus anticoagulant** is an antibody that paradoxically prolongs **APTT** [1] in vitro but is associated with a **prothrombotic state** in vivo, leading to recurrent abortions. - It is a key feature of **Antiphospholipid Syndrome (APS)**, which classically presents with **recurrent pregnancy loss and thrombotic events**. *DIC* - **Disseminated Intravascular Coagulation (DIC)** involves widespread activation of the clotting cascade, leading to both **thrombosis** and **hemorrhage**. - While it can cause prolonged **APTT**, it would also be characterized by **thrombocytopenia**, **prolonged PT**, and elevated **D-dimer** [2], which are not mentioned. *Von Willebrand disease* - **Von Willebrand disease (vWD)** is a common **bleeding disorder** due to deficiency or dysfunction of **von Willebrand factor** [3]. - It can cause a prolonged **APTT** (if factor VIII levels are significantly low) and bleeding, but it is not typically associated with **recurrent abortions** due to thrombosis [3]. *Hemophilia* - **Hemophilia** (A or B) is an **X-linked recessive bleeding disorder** characterized by a deficiency of **Factor VIII (Hemophilia A)** or **Factor IX (Hemophilia B)**. - It causes a prolonged **APTT** and significant bleeding episodes, but it is not associated with **thrombosis** or **recurrent abortions**.

Question 1

A 22-year-old man presents to the emergency department with dyspnea, palpitations, and a headache, which developed shortly after taking trimethoprim-sulfamethoxazole for a urinary tract infection. Laboratory studies reveal a normochromic, normocytic anemia, and a peripheral blood smear shows Heinz bodies. Which of the following is the most likely cause of this patient's anemia?

Accepted Answer

Glucose-6-phosphate dehydrogenase deficiency

Answer

Folate deficiency

Answer

Lead poisoning

Answer

Hereditary spherocytosis

Question 2

All of the following are causes of microcytic hypochromic anemia except:

Accepted Answer

Fanconi's anemia

Answer

Thalassemia

Answer

Iron deficiency anemia

Answer

Lead poisoning

Question 3

What is the treatment for chemotherapy-induced agranulocytopenia?

Accepted Answer

Granulocyte colony-stimulating factor (G-CSF)

Answer

Packed red blood cells

Answer

Platelet transfusion

Answer

Granulocyte-macrophage colony-stimulating factor (GM-CSF), less commonly used.

Question 4

Plummer-Vinson syndrome is characterized by all of the following except:

Accepted Answer

Megaloblastic anemia

Answer

Iron deficiency anemia

Answer

Dysphagia

Answer

Glossitis

Question 5

Hemolytic anemia may be characterized by all of the following except which of the following?

Accepted Answer

Increased plasma haptoglobin level

Answer

Hyperbilirubinemia

Answer

Reticulocytosis

Answer

Hemoglobinuria

Question 6

Which of the following is more likely associated with a platelet disorder rather than hemophilia A?

Accepted Answer

Epistaxis

Answer

Late rebleeding

Answer

Hemarthrosis

Answer

Prolonged activated partial thromboplastin time

Question 7

Which of the following is a potential complication of blood transfusion?

Accepted Answer

Hyperkalemia

Answer

Hyponatremia

Answer

Hypercalcemia

Answer

Increased serum albumin

Question 8

A 15-year-old boy suffering from Hodgkin's disease with lymph node involvement. Which treatment option is likely to have a high success rate?

Accepted Answer

Chemotherapy

Answer

Surgical resection of lymph nodes

Answer

Targeted immunotherapy

Answer

Surgery combined with immunotherapy

Question 9

All-trans-retinoic acid is used in the treatment of:

Accepted Answer

Acute promyelocytic leukemia (APL)

Answer

Acute lymphoblastic leukemia (ALL)

Answer

Chronic myeloid leukemia (CML)

Answer

Transient myeloproliferative disorder (TMD)

Question 10

A female with recurrent abortion and isolated prolonged activated partial thromboplastin time (APTT) is most likely associated with.

Accepted Answer

Lupus anticoagulant

Answer

Hemophilia

Answer

Von Willebrand disease

Answer

DIC

Hematology — MCQs

Hematology — MCQs

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