Hematopathology Practice Questions

Q: What is the shelf life of platelets?

Less than 5 days. **Explanation:** **1. Why Option A is Correct:** Platelets are unique among blood components because they must be stored at **room temperature (20–24°C)** with continuous agitation to maintain their viability and function. Because they are stored at room temperature, there is a significantly high risk of **bacterial proliferation**. To minimize the risk of transfusion-transmitted bacterial infections (sepsis), the shelf life is strictly limited to **5 days**. Some newer technologies (like pathogen reduction or large-volume delayed sampling) may extend this to 7 days in specific settings, but for examination purposes, 5 days remains the standard. **2. Why Incorrect Options are Wrong:** * **Option B (3 weeks):** This corresponds to the shelf life of Whole Blood or Packed Red Blood Cells (PRBCs) collected in **CPD (Citrate Phosphate Dextrose)** anticoagulant, which is 21 days. * **Option C (5 weeks):** This corresponds to the shelf life of PRBCs collected in **CPDA-1** (35 days) or those using additive solutions like SAGM (42 days). * **Option D (2 years):** This refers to the storage of **Fresh Frozen Plasma (FFP)** or Cryoprecipitate when stored at temperatures below -65°C. **3. High-Yield Clinical Pearls for NEET-PG:** * **Storage Temperature:** Platelets = 20–24°C; PRBCs = 2–6°C; FFP = < -18°C. * **Agitation:** Continuous agitation is required for platelets to prevent pH drop and aggregation. * **Bacterial Sepsis:** Platelets are the blood component most commonly associated with transfusion-related sepsis (most common organism: *Staphylococcus epidermidis*). * **Dose Effect:** One unit of Random Donor Platelets (RDP) typically raises the platelet count by 5,000–10,000/µL in an average adult.

Q: Retention of mature neutrophils in bone marrow is known as:

Myelokathesis. **Explanation:** **1. Why Myelokathesis is correct:** **Myelokathesis** (from the Greek *myelo* meaning marrow and *kathesis* meaning retention) is a rare congenital disorder characterized by severe chronic leukopenia and neutropenia. The underlying pathophysiology involves a mutation in the **CXCR4 receptor** gene. Normally, the interaction between CXCR4 on neutrophils and CXCL12 (SDF-1) in the bone marrow keeps precursors in the niche; a "gain-of-function" mutation causes excessive signaling, preventing mature neutrophils from exiting the marrow into the peripheral blood. On a bone marrow aspirate, this manifests as hypercellularity with an abundance of mature, often apoptotic-looking neutrophils (senescent changes like pyknotic nuclei and long filaments connecting nuclear lobes). **2. Why other options are incorrect:** * **Myelocytosis:** This is a general term referring to an increase in myeloid cells (specifically myelocytes) in the blood or bone marrow, often seen in leukemoid reactions or CML. * **Leukocytosis:** This refers to an elevated white blood cell count in the peripheral blood, which is the opposite of what occurs in myelokathesis. * **Leukemia:** This is a malignant proliferation of hematopoietic stem cells leading to the replacement of normal marrow with neoplastic cells (blasts or mature cells), not a retention defect of normal mature cells. **3. High-Yield Clinical Pearls for NEET-PG:** * **WHIM Syndrome:** Myelokathesis is a key component of the WHIM syndrome triad: **W**arts (HPV), **H**ypogammaglobulinemia, **I**nfections, and **M**yelokathesis. * **Genetics:** Look for **CXCR4** gene mutations in clinical vignettes. * **Morphology:** "Hypersegmented" or "pyknotic" neutrophils in a hypercellular marrow despite peripheral neutropenia is the classic diagnostic clue.

Q: Reticulocytosis is NOT a feature of which of the following conditions?

Anemia in chronic renal failure (CRF). **Explanation:** The **Reticulocyte Count** is a direct indicator of the bone marrow's erythropoietic activity. To produce reticulocytes, the marrow requires two things: a functional stimulus (Erythropoietin) and a healthy "factory" (bone marrow). **Why Option D is Correct:** In **Chronic Renal Failure (CRF)**, the primary cause of anemia is the **deficiency of Erythropoietin (EPO)**, which is produced by the peritubular interstitial cells of the kidney [1]. Without EPO, the bone marrow is not stimulated to produce new red cells despite the anemia. Therefore, CRF is characterized by a **hypoproliferative anemia** with a low reticulocyte count (reticulocytopenia) [1]. **Why the other options are incorrect:** * **A. Paroxysmal Nocturnal Hemoglobinuria (PNH):** This is an acquired hemolytic anemia. In response to the destruction of RBCs, a healthy bone marrow compensates by increasing RBC production, leading to reticulocytosis. * **B. Acute Bleeding:** Following a sudden loss of blood, the body increases EPO production to replace the lost volume, resulting in a physiological rise in reticulocytes within 3–5 days. * **C. Hereditary Spherocytosis:** This is a congenital hemolytic anemia due to membrane defects. The marrow remains hyperactive to compensate for the shortened lifespan of the spherocytes, resulting in a high reticulocyte count. **High-Yield Clinical Pearls for NEET-PG:** * **Corrected Reticulocyte Count (CRC):** In anemia, always use CRC to assess marrow response. $CRC = \text{Observed Retic \%} \times (\text{Patient Hct} / \text{Normal Hct})$. * **Reticulocyte Production Index (RPI):** An RPI > 2% indicates an adequate marrow response (hemolysis/hemorrhage); RPI < 2% indicates an inadequate response (nutritional deficiency/marrow failure). * **Other causes of Reticulocytopenia:** Iron/B12/Folate deficiency, Aplastic anemia, and Bone marrow suppression (e.g., chemotherapy).

Question 1

A patient presents with cervical lymphadenopathy. Biopsy demonstrates a nodular lymphoma with follicle formation. This lesion would most likely be associated with which of the following?

Accepted Answer

bcl-2 activation

Answer

bcr-abl hybrid

Answer

c-myc activation

Answer

t(8, 14)

Question 2

What is the shelf life of platelets?

Accepted Answer

Less than 5 days

Answer

Less than 3 weeks

Answer

Less than 5 weeks

Answer

Less than 2 years

Question 3

A 56-year-old woman with a history of breast cancer treated 5 years ago with lumpectomy and radiation, but no chemotherapy, presents with bone pain, fatigue, and weakness. Her complete blood count shows severe anemia, decreased white blood cells, and thrombocytopenia. Examination of a peripheral blood smear reveals a few nucleated red cells, an occasional blast cell, and myelocyte. What is the likely cause of these hematologic abnormalities?

Accepted Answer

Myelophthisic anemia

Answer

Chloramphenicol toxicity

Answer

Diphyllobothrium latum infestation

Answer

Megaloblastic anemia

Question 4

A patient's Prothrombin Time (PT) is 26 seconds, the control PT is 13 seconds, and the sensitivity index is 1.41. Calculate the patient's International Normalized Ratio (INR).

Accepted Answer

(26/13) ^ 1.41

Answer

26/13

Answer

(26/13) x 1.41

Answer

(26/13) + 1.41

Question 5

Which of the following findings are typically visualized using a Romanowsky stain?

Accepted Answer

Reticulocytes and Howell-Jolly bodies

Answer

Reticulocytes and Basophilic stippling

Answer

Basophilic stippling and Heinz bodies

Answer

Reticulocytes and Cabot rings

Question 6

Retention of mature neutrophils in bone marrow is known as:

Accepted Answer

Myelokathesis

Answer

Myelocytosis

Answer

Leukocytosis

Answer

Leukemia

Question 7

Which of the following conditions is inherited in an autosomal recessive pattern?

Accepted Answer

Sickle cell anemia

Answer

Hemophilia

Answer

Hereditary spherocytosis

Answer

Glucose 6-phosphate dehydrogenase deficiency

Question 8

What is the most common subtype of ALL (Acute Lymphoblastic Leukemia)?

Accepted Answer

Pre B cell ALL

Answer

Pre T cell ALL

Answer

T cell ALL

Answer

B cell ALL

Question 9

Which of the following is NOT related to blood coagulation disorders in obstetrics?

Accepted Answer

Thrombocytopenia is a feature of the fibrinolytic process and not of DIC.

Answer

In DIC, RBCs will be 'helmet' shaped or fragmented; in the fibrinolytic process, cell morphology is nominal.

Answer

The Weiner clot observation test gives a rough estimate of the total blood fibrinogen level.

Answer

Thrombocytopenia can be diagnosed from the peripheral smear.

Question 10

Reticulocytosis is NOT a feature of which of the following conditions?

Accepted Answer

Anemia in chronic renal failure (CRF)

Answer

Paroxysmal nocturnal hemoglobinuria

Answer

Following acute bleeding

Answer

Hereditary spherocytosis

Hematopathology — MCQs

Hematopathology — MCQs

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