Hematopathology Practice Questions

Q: With regards to hereditary spherocytosis, which of the following is false?

Aplastic crises are common. ***Aplastic crises are common*** - Aplastic crises occur in cases of **hereditary spherocytosis** due to parvovirus B19 infections, leading to **acute cessation of erythropoiesis** [1][3]. - They are characterized by a **sudden drop in hemoglobin levels**, which is not a common feature of hereditary spherocytosis itself, hence the misconception [1]. *Usually has autosomal dominant inheritance* - Hereditary spherocytosis is primarily inherited in an **autosomal dominant pattern**, where one copy of the mutated gene is sufficient to cause the disease. - However, it can also present in an **autosomal recessive** form, making this statement misleading. *Red blood cells are destroyed in the spleen* - This statement is actually **true**; hereditary spherocytosis leads to the **destruction of abnormally shaped red blood cells** in the spleen due to their rigid membrane structure [2][3]. - The condition is characterized by **hemolytic anemia** resulting from splenic sequestration [3]. *Caused by mutations in genes for proteins such as spectrin, ankrin or band 3* - This is a **correct statement**, as hereditary spherocytosis results from mutations in **membrane proteins** that result in loss of elasticity and stability of the red blood cell membrane [2]. - The mutations commonly involve **spectrin, ankyrin, and band 3 proteins**, leading to the pathophysiology seen in this condition [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 641-642. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598.

Q: Which type(s) of hemophilia is/are X-linked?

Both A & B. ***Both A & B*** - Both **Hemophilia A** and **Hemophilia B** are **X-linked recessive** disorders [1][2] caused by deficiency of specific clotting factors (Factor VIII for A and Factor IX for B). - They are inherited through **carrier females**, affecting predominantly males, showcasing their X-linked transmission [1]. *Hemophilia A* - It is indeed an **X-linked recessive** disorder [2] but does not encompass all types of hemophilia. - It results from a deficiency in **Factor VIII** [2], leading to bleeding disorders, yet is just one form of hemophilia. *Hemophilia C* - This form is **autosomal recessive** and not linked to the X chromosome, primarily affecting both genders equally. - It involves a deficiency of **Factor XI**, distinguishing it from the X-linked nature of A and B. *Hemophilia B* - Like Hemophilia A, it is X-linked but by itself does not account for all hemophilias. - It results from a deficiency in **Factor IX**, yet the question about X-linkage applies to both A and B together. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 151. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 670-671.

Q: What is the most important diagnostic feature for beta thalassemia trait?

Increased HbA2. ***Raised HbA2*** - In beta thalassemia trait, the most significant diagnostic feature is an **increased level of HbA2** (>3.5%), which helps differentiate it from other types of anemias [1]. - This is due to a compensatory mechanism as the body attempts to produce more **alpha globin chains** in response to decreased beta globin production. *Reduced MCV* - While **reduced mean corpuscular volume (MCV)** can indicate microcytic anemia, it is not specific enough for beta thalassemia trait as it can appear in other conditions. - MCV can vary in individuals, making it less reliable as a **diagnostic feature** compared to HbA2 levels. *Raised HbF* - An increase in **hemoglobin F (HbF)** is more characteristic of beta thalassemia major rather than the trait; levels in the trait do not typically rise significantly. - This feature can also be elevated in other conditions, thus not serving as a definitive marker for the trait. *Reduced MCH* - A **decreased mean corpuscular hemoglobin (MCH)** is indicative of microcytic anemia but lacks specificity for beta thalassemia trait alone. - Similar to MCV, it can occur in various types of anemia and does not pinpoint the diagnosis effectively. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 649-650.

Q: Which of the following is a quantitative defect in globin synthesis?

Thalassemia. ***Thalassemia*** - **Thalassemia** is characterized by a **quantitative defect** in globin chain synthesis, leading to reduced hemoglobin production [1][2][5]. - It results in **microcytic anemia** due to ineffective erythropoiesis and imbalanced globin chain production [2]. *Diamond-Blackfan syndrome* - This condition is a type of **macrocytic anemia** due to failure of red blood cell production, rather than a globin synthesis defect. - It generally presents with **normocytic or macrocytic** anemia and is associated with **erythroblastopenia**. *Sickle cell hemoglobinopathy* - Sickle cell disease involves a **qualitative defect** in hemoglobin (Hb S) rather than a quantitative one [3][4][5]. - Symptoms include pain episodes, **vaso-occlusive crises**, and organ damage due to sickling of red blood cells [3][4]. *G6PD deficiency* - G6PD deficiency is an **enzyme deficiency** leading to hemolytic anemia under oxidative stress, not a defect in globin synthesis [4][5]. - Characterized by **episodic hemolytic anemia**, it primarily affects red blood cell stability rather than hemoglobin production [4]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 587-588. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 646-647. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 598-599. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 652-654. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 638.

Q: What is the maximum recommended storage period for platelets in blood banks under standard storage conditions?

5 days. ***5 days*** - The maximum recommended storage period for **platelets** in blood banks under standard conditions is **5 days** as per Indian guidelines (NACO, DGHS). - Platelets are stored at **20-24°C with continuous agitation** to maintain viability and function. - This duration balances optimal platelet function while minimizing the risk of **bacterial contamination**, which increases significantly with longer storage. *3 days* - This is an outdated storage limit that was used in earlier protocols. - While still safe, limiting storage to 3 days would significantly reduce the **availability of platelets** for transfusion and increase wastage. *7 days* - The **US FDA** has approved 7-day storage for platelets with advanced **bacterial detection systems** (since 2020). - However, this is **not the standard in India**; Indian blood banks follow the 5-day protocol unless equipped with approved bacterial testing technology. - Extended storage beyond 5 days requires special regulatory approval and validated bacterial detection methods. *10 days* - Storing platelets for 10 days significantly increases the risk of **bacterial contamination** and marked decline in **platelet viability** and hemostatic function. - There are **no current standard recommendations** that permit routine platelet storage for 10 days in any major blood banking guideline.

Q: What is the neutrophil count for moderate neutropenia?

500 - 1000/mm3. ***500 - 1000/mm3*** - **Moderate neutropenia** is defined as an absolute neutrophil count (ANC) between **500 and 1000 cells/mm³**. - Patients in this range have an increased risk of infection, although generally less severe than those with very low counts. * 1000/mm3* - An absolute neutrophil count of **greater than 1000 cells/mm³** is generally considered within the **mild neutropenia** or even **normal** range, depending on the exact cutoff used in specific contexts (normal range typically 1500-8000 cells/mm³). - This level of neutropenia is usually not clinically significant in terms of increased infection risk. *100/mm3* - An absolute neutrophil count of **100 cells/mm³** falls into the category of **severe neutropenia** (also known as agranulocytosis), which is a critical level. - This count indicates an extremely high risk of serious bacterial and fungal infections.

Q: Which of the following does not cause intravascular hemolysis?

Hereditary spherocytosis. ***Hereditary spherocytosis*** - It primarily causes **extravascular hemolysis** due to spleen sequestration of **abnormal erythrocytes** [2]. - Not typically associated with **intravascular hemolysis**, making it the correct choice here. *Mismatched blood transfusion* - Causes acute **intravascular hemolysis** due to **antibody-mediated destruction** of foreign red blood cells [1]. - Results in **hemoglobinuria**, high bilirubin levels, and potential **renal failure**. *Paroxysmal cold hemoglobinuria* - Induces **intravascular hemolysis** triggered by cold temperatures and **anti-P antibodies** [3]. - Characterized by **acute hemoglobinuria** upon rewarming, complicating the clinical picture [3]. *Thermal burns* - Can lead to **intravascular hemolysis** due to damage to red blood cells from extreme heat. - Associated with **massive tissue injury** and resultant hemolytic reactions in the bloodstream.

Q: On medical check-up of a Punjabi student, the following findings were seen: Hb of 9.9 gm/dL, RBC count of 5.1 million, MCV of 62.5 fL, and RDW of 13.51%. What is the most probable diagnosis?

Thalassemia trait. ***Thalassemia trait*** - The low **MCV (62.5 fl)** and normocytic **RBC count (5.1 million)** indicate microcytic anemia, typical of thalassemia trait. - The **RDW of 13.51%** is relatively normal, distinguishing it from iron deficiency anemia where RDW would be elevated. *Anemia of chronic disease* - This condition usually presents with **normocytic or microcytic anemia**, but typically involves a **low serum iron** and **high ferritin**, which are not mentioned here [1]. - It is often associated with chronic inflammatory conditions, not fitting the RBC parameters given [2]. *HbD* - HbD is a hemoglobin variant typically identified in **specific ethnic groups**, but it does not cause significant anemia like described here with low MCV. - Diagnosis is based on specific hemoglobin electrophoresis patterns, which are not indicated in this case. *Iron deficiency anemia* - Would typically show **lower ferritin levels** and higher RDW, indicating a variation in red cell size, which contrasts with the given RDW [1]. - The RBC count is normal, while iron deficiency often presents with *low RBC counts* and microcytic indices [2].

Q: In which subtype of Hodgkin's disease are popcorn cells predominantly found?

Lymphocyte predominant subtype. ***Lymphocyte predominant*** - Popcorn cells, or **"L&H" (Lymphocytic and Histiocytic) cells**, are characteristic of lymphocyte predominant Hodgkin's disease, indicating a **rich lymphocytic background** [1]. - This subtype is more commonly seen in younger patients and is associated with a better prognosis relative to other types of Hodgkin's lymphoma [1]. *Mixed cellularity* - This subtype is characterized by a **varied cellular composition** including numerous Reed-Sternberg cells but does not specifically feature popcorn cells [2]. - It tends to have a higher number of **eosinophils** and **plasma cells** rather than lymphocytes predominating [2]. *Lymphocyte depletion* - Lymphocyte depletion is marked by a **deficient lymphocytic component** and an abundance of Reed-Sternberg cells, lacking the characteristic popcorn cells. - This variant is often more aggressive and typically has a poorer prognosis. *Nodular sclerosis* - Nodular sclerosis is recognized by the presence of **collagen bands** separating lymphoid nodules and also does not include popcorn cells. - This form is the most common variant of Hodgkin's lymphoma and often presents with **mediastinal masses**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, p. 618. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 616-618.

Question 1

What is the purpose of the Direct Coombs' test?

Accepted Answer

Detection of immune components bound to red blood cells (RBCs).

Answer

Detection of immune components in the serum.

Answer

Detection of cell surface antigens on red blood cells (RBCs).

Answer

Detection of antigens circulating in the serum.

Question 2

With regards to hereditary spherocytosis, which of the following is false?

Accepted Answer

Aplastic crises are common

Answer

Caused by mutations in genes for proteins such as spectrin, ankyrin or band 3

Answer

Usually has autosomal dominant inheritance

Answer

Red blood cells are destroyed in the spleen

Question 3

Which type(s) of hemophilia is/are X-linked?

Accepted Answer

Both A & B

Answer

Hemophilia A

Answer

Hemophilia B

Answer

Hemophilia C

Question 4

What is the most important diagnostic feature for beta thalassemia trait?

Accepted Answer

Increased HbA2

Answer

Increased HbF

Answer

Decreased MCH

Answer

Decreased MCV

Question 5

Which of the following is a quantitative defect in globin synthesis?

Accepted Answer

Thalassemia

Answer

Sickle cell hemoglobinopathy

Answer

G6PD deficiency

Answer

Diamond-Blackfan syndrome

Question 6

What is the maximum recommended storage period for platelets in blood banks under standard storage conditions?

Accepted Answer

5 days

Answer

7 days

Answer

3 days

Answer

10 days

Question 7

What is the neutrophil count for moderate neutropenia?

Accepted Answer

500 - 1000/mm3

Answer

<500/mm3

Answer

>1000/mm3

Answer

100/mm3

Question 8

Which of the following does not cause intravascular hemolysis?

Accepted Answer

Hereditary spherocytosis

Answer

Mismatched blood transfusion

Answer

Paroxysmal cold hemoglobinuria

Answer

Thermal burns

Question 9

On medical check-up of a Punjabi student, the following findings were seen: Hb of 9.9 gm/dL, RBC count of 5.1 million, MCV of 62.5 fL, and RDW of 13.51%. What is the most probable diagnosis?

Accepted Answer

Thalassemia trait

Answer

HbD

Answer

Iron deficiency anemia

Answer

Anemia of chronic disease

Question 10

In which subtype of Hodgkin's disease are popcorn cells predominantly found?

Accepted Answer

Lymphocyte predominant subtype

Answer

Nodular sclerosis subtype

Answer

Mixed cellularity subtype

Answer

Lymphocyte depletion subtype

Hematopathology — MCQs

Hematopathology — MCQs

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