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: 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 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: Blood is stored at what temperature in blood bank?

1 to 6 degrees Celsius. ***1 to 6 degrees Celsius*** - This temperature range is critical for maintaining the **viability of red blood cells** and slowing down metabolic processes, ensuring the blood is safe for transfusion. - At this temperature, the growth of most **pathogenic bacteria** is inhibited, and the degradation of blood components is minimized. *-2 to -4 degrees Celsius* - Temperatures below 0°C would cause **ice crystal formation** within the red blood cells, leading to hemolysis and making the blood unsuitable for transfusion. - This range is typically used for the **long-term storage of frozen plasma** or cryoprecipitate after special processing, not whole blood or red blood cell units. *-2 to 0 degrees Celsius* - This temperature range is incorrect for storing whole blood or packed red blood cells as it is still likely to cause **freezing and cellular damage**. - While close to freezing, even slight freezing can result in **hemolysis** and render the blood product unusable. *6 to 12 degrees Celsius* - Temperatures above 6°C significantly increase the **metabolic activity of red blood cells** and the risk of **bacterial growth**. - This range would lead to a more rapid decline in the viability and safety of the stored blood, reducing its shelf life considerably.

Q: What is the defect in Glanzmann's thrombasthenia?

GpIIb-IIIa. ***Gp1Ib-IlIa*** - Glanzmann's thrombasthenia is characterized by a defect in the **Gp1b-IlIa complex**, which is essential for platelet aggregation. - Patients with this condition exhibit **prolonged bleeding time** and poor clot formation due to ineffective platelet-fibrinogen binding. *GpIIIa-I lb* - This option refers to a component of the GpIIb-IIIa complex, which is primarily involved in **platelet aggregation** and is not the defect in Glanzmann's thrombasthenia. - Defects in GpIIb-IIIa lead to conditions such as **Glanzmann's thrombasthenia** [1], but specifically, the Gp1b-IlIa complex is implicated. *Gpfilb-I la* - This designation does not correspond correctly to either a known receptor complex related to platelet function or to Glanzmann's thrombasthenia. - Mislabeling of the glanzmann's complex results in confusion as it does not specify the **correct interaction involved in platelet aggregation**. *GpIla-Illb* - This combination refers to components that are not involved in Glanzmann's thrombasthenia, which specifically involves the **Gp1b-IlIa interaction**. - GpIla-Illb complex is part of the **integrin family**, but its defect does not lead to the bleeding problems seen in Glanzmann's thrombasthenia [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 668-669.

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.

Q: In a blood typing test, no agglutination is observed with anti-A and anti-B antisera, but agglutination is observed with anti-D (Rh) antisera. What is the blood type?

O+ve. ***O+ve*** - No agglutination with **anti-A** and **anti-B antisera** indicates the absence of A and B antigens, characteristic of **blood group O**. - Agglutination with **anti-D (Rh) antisera** signifies the presence of the **Rh antigen**, thereby indicating a positive (+) blood type. *O-ve* - While no agglutination with anti-A and anti-B points to **blood group O**, no agglutination with **anti-D** would be expected for an Rh-negative type. - The observed agglutination with **anti-D** contradicts an Rh-negative classification. *A+ve* - Agglutination with **anti-A antisera** would be expected for an A blood type, which is not observed in this scenario. - While agglutination with **anti-D** is consistent with 'positive', the absence of agglutination with **anti-A** rules out 'A' blood group. *B-ve* - Agglutination with **anti-B antisera** would be expected for a B blood type, which is not observed in this scenario. - The agglutination with **anti-D** contradicts an Rh-negative classification, making **B-ve** incorrect.

Q: Which of the following is an example of an intracorpuscular defect causing hemolysis?

Paroxysmal nocturnal hemoglobinuria (PNH). ***PNH*** - **Paroxysmal Nocturnal Hemoglobinuria (PNH)** is caused by a deficiency of glycosylphosphatidylinositol (GPI) anchors, leading to **intracorpuscular defects** in red blood cells [1]. - It results in **hemolysis**, mainly due to increased complement-mediated lysis and associated symptoms like **hemoglobinuria** and dark urine upon waking [1]. *Portal hypertension* - Portal hypertension primarily affects the **portal venous system** and is not directly related to **intracorpuscular defects** in hemolysis. - It can lead to **splenomegaly** and subsequent sequestration of blood cells but does not cause intrinsic RBC defects. *PCH* - **Paroxysmal Cold Hemoglobinuria (PCH)** involves hemolysis due to exposure to cold and is associated with **IgG antibodies** against RBCs, but it's not an **intracorpuscular** defect. - PCH is characterized by hemolysis occurring in response to cold temperatures, rather than an intrinsic defect within the RBCs themselves. *Uremic syndrome* - Uremic syndrome arises due to **kidney failure**, leading to a buildup of waste products and a distinct form of **extracorpuscular hemolysis**, not intracorpuscular defects. - While it can cause anemia, it does not directly involve intrinsic RBC abnormalities like those seen in PNH. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 650-651. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 642-643. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598.

Q: In which type of Hodgkin's lymphoma are classical Reed-Sternberg cells most characteristically observed?

Mixed cellularity Hodgkin. ***Lymphocyte predominance*** - The **Hodgkin's lymphoma (HL) lymphocyte predominance** variant characteristically displays a predominance of lymphocytes in the cellular makeup [1]. - This subtype is often associated with a better prognosis and fewer symptoms than other types of HL [1]. *Lymphocyte depleted* - This subtype features a significant decrease in lymphocytes, leading to a **higher proportion of Reed-Sternberg cells** [3]. - It typically presents with a more aggressive clinical course, which contrasts with lymphocyte predominance [3]. *Mixed cellularity hodgkin* - Mixed cellularity shows a variety of cell types, including a significant number of **Reed-Sternberg cells**, but does not demonstrate **lymphocyte predominance** [2]. - This subtype is generally found in older patients and associated with advanced disease, unlike lymphocyte predominance [2]. *Nodular sclerosis* - Nodular sclerosis subtype is characterized by **collagen bands** and a particular architecture that is distinct from lymphocyte predominance [2]. - It primarily affects younger patients and can often involve mediastinal lymph nodes; however, it does not have the features of lymphocyte predominance [2]. **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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 559-560.

Q: Which marker is commonly associated with positivity in follicular lymphoma?

Bcl-2. ***Bcl-2*** - **Follicular lymphoma** is characterized by the overexpression of the **Bcl-2 protein**, which inhibits apoptosis, leading to the survival of malignant B cells [1][3]. - The **Bcl-2 gene** is often involved in the **t(14;18)** chromosomal translocation, which is a hallmark of this lymphoma [1][3][4]. *Bcl-6* - Although **Bcl-6** can be expressed in some lymphomas, it is primarily associated with **diffuse large B-cell lymphoma**, not follicular lymphoma. - **Bcl-6** is involved in **germinal center formation** and its positivity does not indicate follicular lymphoma specifically. *Bcl-1* - **Bcl-1** (also known as **CCND1**) is primarily associated with **mantle cell lymphoma** and is not a characteristic marker for follicular lymphoma. - It is linked to the **t(11;14)** translocation, which is distinct from the genetic alterations seen in follicular lymphoma. *None of the above* - This option is incorrect as **Bcl-2 positivity** is definitive for follicular lymphoma [2]. - The presence of other markers like **Bcl-6** or **Bcl-1** does not negate the expression of Bcl-2 in this lymphoma type. **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, pp. 602-604. [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, p. 604. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 561-562. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311.

Question 1

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 2

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 3

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 4

Blood is stored at what temperature in blood bank?

Accepted Answer

1 to 6 degrees Celsius

Answer

-2 to -4 degrees Celsius

Answer

-2 to 0 degrees Celsius

Answer

6 to 12 degrees Celsius

Question 5

What is the defect in Glanzmann's thrombasthenia?

Accepted Answer

GpIIb-IIIa

Answer

GpIIIa-Ib

Answer

GpIIa-IIIb

Answer

GpIIb-Ia

Question 6

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

Question 7

In a blood typing test, no agglutination is observed with anti-A and anti-B antisera, but agglutination is observed with anti-D (Rh) antisera. What is the blood type?

Accepted Answer

O+ve

Answer

O-ve

Answer

A+ve

Answer

B-ve

Question 8

Which of the following is an example of an intracorpuscular defect causing hemolysis?

Accepted Answer

Paroxysmal nocturnal hemoglobinuria (PNH)

Answer

Toxins in uremia

Answer

Paroxysmal Cold Hemoglobinuria

Answer

Mechanical trauma in portal hypertension

Question 9

In which type of Hodgkin's lymphoma are classical Reed-Sternberg cells most characteristically observed?

Accepted Answer

Mixed cellularity Hodgkin

Answer

Lymphocyte depleted

Answer

Nodular sclerosis

Answer

Lymphocyte predominance

Question 10

Which marker is commonly associated with positivity in follicular lymphoma?

Accepted Answer

Bcl-2

Answer

Bcl-1

Answer

Bcl-6

Answer

None of the options

Hematopathology — MCQs

Hematopathology — MCQs

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