Question 1

Which element is essential for the formation of hemoglobin?

Accepted Answer

Answer reason: Iron is required to form heme, the porphyrin ring structure in hemoglobin that contains a central iron atom. This iron (Fe2+) reversibly binds oxygen, enabling hemoglobin to transport oxygen in the blood. Inadequate iron availability impairs hemoglobin synthesis and can lead to microcytic, hypochromic anemia. Calcium, potassium, and zinc are important minerals but are not the key elemental component of hemoglobin’s oxygen-binding site.
Category reason: The question tests the biochemical/physiologic component needed to synthesize hemoglobin, a core topic in blood and red cell function, which fits Hematology within NursingScience rather than nursing interventions or clinical prioritization.

Question 2

Life Span of RBC in body?

Accepted Answer

Answer reason: The normal lifespan of an erythrocyte (RBC) in circulation is about 120 days. After this period, aging RBCs are removed primarily by the spleen and liver macrophages (extravascular hemolysis). This foundational fact is used clinically to interpret hemolytic anemias and the relationship between RBC turnover and lab markers such as bilirubin and reticulocyte count.
Category reason: The item tests a basic fact about red blood cell biology and turnover rather than a nursing intervention or clinical decision, which fits Hematology within NursingScience.

Question 3

In a pt blood smear examination Heinz body and Bite cells were found. Diagnosis should be?

Accepted Answer

Answer reason: Heinz bodies represent denatured hemoglobin from oxidative stress, and splenic macrophages remove these inclusions producing characteristic “bite cells.” This blood smear pattern is classic for G6PD deficiency, where reduced NADPH impairs glutathione regeneration, making RBCs vulnerable to oxidant injury. Thalassemia and sideroblastic anemia have different smear findings, and hemophilia is a coagulation disorder rather than an RBC morphology problem.
Category reason: The question tests recognition of peripheral smear morphology (Heinz bodies and bite cells) and linking it to a specific hematologic disorder, which is foundational biomedical knowledge in Hematology rather than a nursing management decision.

Question 4

Which of the following organs is known as the “graveyard” of red blood cells?

Accepted Answer

Answer reason: The spleen is termed the “graveyard” of red blood cells because it filters circulating blood and removes old, damaged, or abnormal erythrocytes from the circulation. Splenic macrophages phagocytose these RBCs, and hemoglobin is broken down with iron recycled and heme converted to bilirubin. While the liver also participates in breakdown and recycling, the primary site for physiologic sequestration and destruction of senescent RBCs is the spleen.
Category reason: This is a foundational question about where senescent red blood cells are removed from circulation, which is a core concept in blood cell lifecycle and reticuloendothelial function within Hematology.

Question 5

Which color blood cells fight infection?

Accepted Answer

Answer reason: White blood cells (leukocytes) are the primary immune cells responsible for recognizing and destroying pathogens and coordinating inflammatory and immune responses. Red blood cells mainly transport oxygen via hemoglobin and are not involved in fighting infection. “Yellow” is not a blood cell type and does not describe an immune function. Therefore, the correct choice is white blood cells.
Category reason: This question tests foundational knowledge of blood components and their functions, specifically leukocytes in immune defense, which is part of Hematology rather than nursing decision-making or patient care actions.

Question 6

Hemophilia A is the deficiency of ?

Accepted Answer

Answer reason: Hemophilia A is caused by a deficiency of coagulation factor VIII, leading to impaired intrinsic pathway function and delayed fibrin clot formation. Hemophilia B (Christmas disease) is factor IX deficiency, which helps distinguish the two. Factor V deficiency is a different, rarer bleeding disorder and is not hemophilia A. Therefore, the best answer is factor VIII.
Category reason: This is a foundational biomedical question about a specific coagulation factor deficiency causing a named bleeding disorder, which belongs to Hematology rather than nursing care prioritization or interventions.

Question 7

The most common form of leukemia in children is ?

Accepted Answer

Answer reason: Acute lymphoblastic leukemia (ALL) is the most common childhood leukemia, accounting for the majority of leukemia cases in children. In contrast, AML is less common in pediatrics, and chronic leukemias (CLL, CML) are predominantly diseases of adults and are rare in children. Therefore, ALL is the single best answer.
Category reason: The item tests epidemiologic knowledge of blood cancers (types of leukemia and their frequency in children), which is a core topic within Hematology rather than a nursing intervention or patient-care decision.

Question 8

Bence-Jones protein is present in case of?

Accepted Answer

Answer reason: Bence-Jones proteins are free monoclonal immunoglobulin light chains excreted in the urine, classically associated with plasma cell dyscrasias, especially multiple myeloma. Their presence reflects overproduction of light chains that can be filtered by the kidney and may contribute to cast nephropathy. Among the options, the myeloma choice (though imprecisely worded as “chronic myeloid myeloma”) is the best match; lymphoma and CLL are not the classic association.
Category reason: This question tests recognition of a characteristic laboratory finding (Bence-Jones proteinuria) and its association with a hematologic malignancy (multiple myeloma), which is foundational hematology knowledge rather than a nursing intervention scenario.

Question 9

Normal platelet count is ?

Accepted Answer

Answer reason: The normal platelet count in adults is approximately 150,000–450,000/mm³ (or per µL), which supports normal primary hemostasis. Counts far below this range increase bleeding risk (thrombocytopenia), while markedly elevated counts raise thrombotic risk (thrombocytosis). Among the choices, option A is clearly intended to represent 150,000–450,000/mm³; the others are either too high, too low, or reflect clinically abnormal ranges.
Category reason: This question tests a standard normal hematologic laboratory reference range (platelet count), which is foundational blood science rather than a nursing intervention or prioritization scenario, so it belongs to Hematology under NursingScience.

Question 10

It's an acute hemolytic anemia occurring after the ingestion of broad bean in individual with deficiency of G6PD :

Accepted Answer

Answer reason: In G6PD deficiency, oxidative stress can precipitate acute hemolysis because red blood cells cannot generate enough NADPH to maintain reduced glutathione. Fava (broad) beans contain oxidant compounds that commonly trigger this hemolytic episode. This presentation is specifically termed favism. The other options refer to chronic inherited anemias or bone marrow failure syndromes rather than an acute oxidant-induced hemolysis.
Category reason: This question tests recognition of a hematologic disorder and its trigger (acute hemolysis in G6PD deficiency after fava bean ingestion), which is core Hematology knowledge rather than a nursing intervention/prioritization scenario.

Question 11

................. is a multiple small , peripheral grape like purple clusters of iron?

Accepted Answer

Answer reason: Pappenheimer bodies are iron-containing granules (siderotic granules) in RBCs that appear as small, peripheral, grape-like clusters on a Wright stain and are confirmed with Prussian blue. They are commonly associated with sideroblastic anemia, post-splenectomy states, and impaired iron utilization. Howell–Jolly bodies are usually single, round DNA remnants, and Heinz bodies are denatured hemoglobin (typically requiring supravital staining), so they do not match the described clustered iron granules.
Category reason: This question tests identification of red blood cell inclusions and their composition (iron granules), which is a core topic in blood cell morphology and hematologic diagnostics.

Question 12

The blood smear gives the physician information concerning:

Accepted Answer

Answer reason: A peripheral blood smear is used to evaluate blood cell morphology, including RBC and platelet appearance. It can reveal abnormal RBC inclusions (e.g., Howell-Jolly bodies, basophilic stippling) that suggest specific disorders. It also helps identify immature or abnormal circulating cells (e.g., blasts, left shift), which is important in anemia, infection, and hematologic malignancy evaluation. Therefore, all listed statements are correct.
Category reason: This question tests interpretation and utility of a peripheral blood smear in assessing blood cell morphology and abnormal/immature cells, which is a core concept in Hematology.

Question 13

Hypersplenism is one of the causes of ?

Accepted Answer

Answer reason: Hypersplenism causes increased sequestration and premature destruction of blood cells within an enlarged, overactive spleen. This accelerated red blood cell clearance produces a hemolytic pattern of anemia, often with associated cytopenias (e.g., thrombocytopenia, leukopenia). In contrast, iron-deficiency anemia is due to reduced iron availability, aplastic anemia is due to bone marrow failure, and megaloblastic anemia is due to impaired DNA synthesis (e.g., B12/folate deficiency). Therefore, hemolytic anemia is the best match.
Category reason: This question tests a disease mechanism and etiology of anemia related to splenic red blood cell destruction, which is a core concept in Hematology rather than a nursing care decision.

Question 14

Increased reductocytosis count is seen in cases of?

Accepted Answer

Answer reason: Reticulocytosis reflects an increased bone marrow response to hemolysis or blood loss. Hereditary spherocytosis, G6PD deficiency, and sickle cell anemia are all hemolytic anemias that shorten red cell lifespan, stimulating erythropoietin release and increased reticulocyte production. Therefore, an increased reticulocyte count can be seen in all listed conditions.
Category reason: This question tests recognition of reticulocytosis as a laboratory/hematologic response in hemolytic anemias, which is core Hematology foundational science rather than a nursing intervention or prioritization scenario.

Question 15

Heinz bodies are seen in cases of?

Accepted Answer

Answer reason: Heinz bodies are precipitated, denatured hemoglobin inclusions that form when red blood cells undergo oxidative stress. In G-6PD deficiency, reduced NADPH and glutathione impair protection against oxidant injury, leading to hemoglobin denaturation and Heinz body formation. These inclusions can be removed by splenic macrophages, producing bite cells on peripheral smear. The other listed membrane or hemoglobinopathies do not classically produce Heinz bodies as the hallmark finding.
Category reason: This question tests recognition of a classic red blood cell morphologic finding and its associated hematologic disorder, which falls under Hematology in foundational biomedical sciences rather than nursing interventions or patient-care prioritization.

Question 16

............... is caused by substitution of amino acid (valine) instead of glutamic acid at position N0.6 in the beta chain of hemoglobin?

Accepted Answer

Answer reason: Sickle hemoglobin (Hb-S) results from a point mutation in the beta-globin gene that substitutes valine for glutamic acid at the 6th position of the beta chain. This hydrophobic valine promotes hemoglobin polymerization when deoxygenated, leading to RBC sickling and hemolysis. The other hemoglobins (Hb-A, Hb-A2, Hb-F) have different globin chain compositions and are not defined by this specific beta-6 substitution.
Category reason: This question tests the molecular/hematologic basis of an abnormal hemoglobin variant (beta-globin amino acid substitution) underlying sickle cell disease, which falls under Hematology rather than nursing interventions or patient-care prioritization.

Question 17

Atrophy of the spleen is seen in cases of?

Accepted Answer

Answer reason: Sickle cell anemia causes repeated vaso-occlusive infarctions of the splenic tissue due to sickled erythrocytes obstructing microvasculature. Over time this leads to progressive fibrosis and shrinkage of the spleen, termed autosplenectomy (functional asplenia with splenic atrophy). In contrast, thalassemia more typically causes splenomegaly from extramedullary hematopoiesis and increased sequestration, not atrophy. Therefore, sickle cell anemia is the best answer.
Category reason: This is a foundational disease-pathophysiology question about hematologic disorders and their effect on splenic morphology/function, which best fits Hematology under NursingScience rather than a nursing intervention or prioritization scenario.

Question 18

Iron deficiency lead to :

Accepted Answer

Answer reason: Iron is required for hemoglobin synthesis; deficiency reduces hemoglobin content, producing hypochromic (pale) red blood cells. With impaired hemoglobin production, erythrocytes undergo extra divisions, resulting in smaller-than-normal cells (microcytosis). Therefore, the classic anemia pattern in iron deficiency is microcytic, hypochromic anemia. The other options correspond to different mechanisms (e.g., B12/folate deficiency causing macrocytosis, hemolysis causing hemolytic anemia).
Category reason: This question tests the hematologic classification of anemia based on iron’s role in hemoglobin synthesis and RBC indices, which is foundational biomedical knowledge rather than a nursing intervention scenario.

Question 19

Neurological symptoms are seen in cases of?

Accepted Answer

Answer reason: Neurologic symptoms (e.g., paresthesias, gait disturbance, loss of vibration/position sense) are characteristic of vitamin B12 deficiency due to demyelination of the dorsal columns and lateral corticospinal tracts (subacute combined degeneration). Folate deficiency causes megaloblastic anemia but typically does not produce neurologic deficits. Iron deficiency anemia primarily causes fatigue, pallor, and pica rather than focal neurologic findings, so “all of the above” is incorrect.
Category reason: This question tests the hematologic cause of neurologic manifestations in anemia, which is a foundational biomedical knowledge topic within Hematology rather than a nursing-care decision or intervention.

Question 20

Megaloplastic hematopoiesis is seen in cases of?

Accepted Answer

Answer reason: Megaloblastic hematopoiesis results from impaired DNA synthesis in hematopoietic precursors, classically due to folate or vitamin B12 deficiency. Folate deficiency leads to ineffective erythropoiesis with enlarged, immature red cell precursors (megaloblasts) and macrocytosis. Iron deficiency causes microcytic anemia rather than megaloblastic changes, and vitamin C or B2 deficiencies do not typically produce megaloblastic hematopoiesis.
Category reason: This question tests the biomedical mechanism and causes of megaloblastic blood cell formation, which is a core concept in Hematology rather than nursing care actions or prioritization.

Question 21

.......... promotes blood clotting and help to prevent blood loss from damaged blood vessels:

Accepted Answer

Answer reason: Platelets (thrombocytes) are the primary blood component responsible for hemostasis: they adhere to damaged endothelium, aggregate to form a platelet plug, and provide a surface for coagulation factor activation. This process reduces bleeding from injured vessels. WBCs mainly function in immune defense, and RBCs primarily transport oxygen; neither is the main mediator of clot formation. Therefore, "all of the above" is incorrect because only platelets directly promote clotting.
Category reason: This question tests foundational knowledge of blood components and their roles in clotting (hemostasis), which is a core topic in Hematology rather than a nursing intervention or prioritization scenario.

Question 22

Antibody induced hemolytic disease in new born that is caused by blood group incompatibility between mother and fetus?

Accepted Answer

Answer reason: Hemolytic disease of the newborn due to maternal-fetal blood group incompatibility (most classically Rh, also ABO) is termed erythroblastosis fetalis. Maternal IgG antibodies cross the placenta, opsonize fetal RBCs, and cause hemolysis leading to fetal anemia and hyperbilirubinemia. The other options do not describe antibody-mediated alloimmune hemolysis in a newborn (hereditary spherocytosis is genetic; TTP is a platelet/thrombotic disorder; hydroblastosis is not the standard term for this condition).
Category reason: This question tests the scientific/medical definition of an alloimmune hemolytic anemia of the newborn related to blood group incompatibility, which falls under hematology rather than nursing interventions or prioritization.

Question 23

Young red blood cell with cytoplasmic RNA:

Accepted Answer

Answer reason: A reticulocyte is an immature red blood cell that still contains residual ribosomal RNA in the cytoplasm, which can be detected with supravital stains (reticulum). In contrast, spherocytes, stomatocytes, and elliptocytes are mature RBC morphology variants defined by cell shape changes, not by retained cytoplasmic RNA. Therefore, the young RBC with cytoplasmic RNA is the reticulocyte.
Category reason: This question tests identification of an immature erythrocyte based on a defining cellular feature (residual cytoplasmic RNA), which is a core concept in hematology.

Question 24

Normal adult hemoglobin tetramer is?

Accepted Answer

Answer reason: Normal adult hemoglobin is predominantly hemoglobin A (HbA), which is composed of two alpha and two beta globin chains (α2β2). Fetal hemoglobin (HbF) is α2γ2 and is the major form during fetal life, not in normal adults. Hemoglobin A2 (α2δ2) is a minor adult fraction and is not the primary normal adult tetramer. Therefore, the best answer is 2 alpha : 2 beta.
Category reason: This question tests the biochemical/physiologic composition of hemoglobin types (globin chain structure), which is core content in blood science rather than nursing care decisions, fitting Hematology under NursingScience.

Question 25

________ represent 2-4 % of total leukocyte:

Accepted Answer

Answer reason: Eosinophils normally comprise about 1–4% (often cited as 2–4%) of circulating leukocytes in a typical differential count. Neutrophils are the most abundant (roughly 50–70%), monocytes are higher than eosinophils (about 2–8%), and basophils are the least common (about 0–1%). Therefore, the leukocyte type representing 2–4% is eosinophils.
Category reason: This question tests normal leukocyte differential percentages, which is foundational blood science and best categorized under Hematology rather than nursing interventions or clinical prioritization.

Question 26

......... are small cytoplasmic fragment derived from megakaryocytes?

Accepted Answer

Answer reason: Platelets (thrombocytes) are anucleate cytoplasmic fragments that bud off from megakaryocytes in the bone marrow. Their primary role is hemostasis, including platelet adhesion, activation, and aggregation to form the initial platelet plug. RBCs and WBCs are complete cells (RBCs are enucleated but not fragments), so they are not derived as cytoplasmic fragments from megakaryocytes.
Category reason: This question tests foundational blood cell biology—specifically the origin and definition of platelets from megakaryocytes—which falls under Hematology rather than nursing interventions or clinical judgment.

Question 27

Which cells are more in number in human blood?

Accepted Answer

Answer reason: Red blood cells (RBCs) are the most numerous formed elements in human blood, averaging about 4.5–6.0 million/µL. Platelets are far fewer (roughly 150,000–450,000/µL), and white blood cells are fewer still (about 4,000–11,000/µL). Plasma cells are not normally present in significant numbers in peripheral blood; they are primarily found in bone marrow and lymphoid tissues. Therefore, RBCs are the correct choice.
Category reason: This question tests basic knowledge of the relative counts of blood components (formed elements) in circulation, which is a core topic within hematology.

Question 28

The platelets in blood do ....?

Accepted Answer

Answer reason: Platelets (thrombocytes) are cell fragments that play a primary role in hemostasis by adhering to damaged endothelium and aggregating to form a platelet plug. They also provide a phospholipid surface that supports the coagulation cascade and stabilizes clot formation. Oxygen transport is performed by red blood cells via hemoglobin, and fighting infection is mainly the role of white blood cells. Therefore, the best answer is that platelets aid in blood clotting.
Category reason: This is a foundational question about the function of blood components (platelets) and their role in hemostasis, which is a core topic in hematology rather than nursing intervention/priority setting.

Question 29

RBCs are also called?

Accepted Answer

Answer reason: Red blood cells (RBCs) are termed erythrocytes (erythro- meaning red, -cyte meaning cell). Leukocytes are white blood cells, platelets are thrombocytes involved in clotting, and plasma is the liquid component of blood. Therefore, the correct synonym for RBCs is erythrocytes.
Category reason: This question tests basic knowledge of blood cell terminology and components, which is a core topic within Hematology rather than a nursing intervention or prioritization scenario.

Question 30

Universal Receptor Blood Group Is?

Accepted Answer

Answer reason: AB+ is the universal recipient for red blood cell transfusions because it has both A and B antigens and is Rh-positive, so it lacks anti-A, anti-B, and anti-D antibodies that would attack donor RBCs. Therefore, it can receive RBCs from all ABO types (A, B, AB, O) and from both Rh+ and Rh− donors. In contrast, O− is the universal donor (for RBCs), not the universal recipient.
Category reason: This question tests foundational knowledge of ABO/Rh compatibility and transfusion immunohematology rather than nursing actions or prioritization, so it fits Hematology within NursingScience.

Question 31

Which of the following are the most abundant in WBCs?

Accepted Answer

Answer reason: Neutrophils are the most abundant leukocytes in peripheral blood, typically comprising about 50–70% of circulating WBCs in healthy adults. They are key innate immune cells and are usually the first responders to acute bacterial infection and inflammation. In contrast, lymphocytes are usually second most common (about 20–40%), while eosinophils and basophils are present in much smaller proportions.
Category reason: This is a foundational question about the normal differential distribution of white blood cell types, which is part of hematology and basic biomedical science rather than nursing interventions or clinical prioritization.

Question 32

The pathology that results when a person does not have enough platelets is best termed ________.?

Accepted Answer

Answer reason: A decreased platelet count is termed thrombocytopenia (thrombo=clot, cyto=cell, penia=deficiency). This condition increases bleeding risk because platelets are essential for primary hemostasis and clot formation. The other options do not mean low platelets: thromboangiitis is vessel inflammation, thrombocythemia is elevated platelets, thrombopathia is platelet dysfunction, and anemia refers to low red cells/hemoglobin.
Category reason: The question tests biomedical terminology/definition of a blood disorder (low platelet count), which is a core topic in Hematology rather than a nursing intervention or prioritization scenario.

Question 33

Blood group O lacks:

Accepted Answer

Answer reason: In the ABO system, type O red blood cells do not express A or B antigens on their surface. Because these antigens are absent, individuals with type O blood naturally have both anti-A and anti-B antibodies in their plasma. Therefore, the defining feature of group O is lack of A and B antigens, not lack of antibodies, plasma, or RBCs.
Category reason: This question tests foundational knowledge of ABO blood group antigen/antibody patterns, which is a core topic in blood science and transfusion basics within Hematology.

Question 34

Blood donation can be repeated after?

Accepted Answer

Answer reason: For whole-blood donation, a common minimum interval is about 3 months (≈90 days) to allow recovery of red cell mass and iron stores. Plasma volume is replaced quickly, but hemoglobin/iron repletion takes substantially longer, so shorter intervals like 15 or 30 days are unsafe for routine whole-blood donation. While some programs use longer intervals (e.g., ~112 days/16 weeks), 90 days is the best match among the provided options.
Category reason: This item tests knowledge of blood donation intervals and hematologic recovery after phlebotomy, which is a foundational hematology concept rather than a nursing care decision.

Question 35

Iron is a component of?

Accepted Answer

Answer reason: Iron is an essential component of the heme portion of hemoglobin, enabling hemoglobin to bind and transport oxygen in red blood cells. Without adequate iron, heme synthesis decreases and oxygen-carrying capacity falls, leading to iron-deficiency anemia. Gastric juice and pancreatic juice contain enzymes and acid/bicarbonate, not iron as a defining component, and lymph is primarily a fluid with immune cells and proteins rather than an iron-based molecule.
Category reason: This question tests foundational knowledge of blood composition and the biochemical makeup of hemoglobin, which falls under Hematology rather than nursing interventions or clinical decision-making.

Question 36

Which of the following is not a component of blood?

Accepted Answer

Answer reason: Blood is composed of plasma and formed elements (red blood cells, white blood cells, and platelets). Hemoglobin is the oxygen-carrying protein contained within red blood cells, making it part of blood. Hepatocytes are liver parenchymal cells and are not found as a normal component of circulating blood.
Category reason: This question tests foundational knowledge of blood composition and formed elements, which is a core topic within Hematology rather than nursing decision-making or patient-care prioritization.

Question 37

Which of the following blood cells play an important role in blood clotting?

Accepted Answer

Answer reason: Thrombocytes (platelets) are the primary blood elements responsible for initiating hemostasis by adhering to damaged endothelium and aggregating to form a platelet plug. They also provide a phospholipid surface that supports activation of the coagulation cascade, leading to fibrin formation and a stable clot. Leukocytes/neutrophils are mainly involved in immune defense, and erythrocytes primarily transport oxygen and carbon dioxide rather than driving clot formation.
Category reason: The question tests foundational knowledge of which blood component is responsible for clotting, a core topic within hematology rather than nursing judgment or patient-care prioritization.

Question 38

In cancer which cells are dead??

Accepted Answer

Answer reason: Among the listed blood elements, mature red blood cells (RBCs) are considered “dead” in the sense that they lack a nucleus and mitochondria and cannot divide or perform protein synthesis. Most white blood cells are living nucleated cells with active metabolism, and platelets are cell fragments (anucleate) rather than complete cells. Therefore, the best answer to which cells are dead is RBC.
Category reason: This question tests foundational knowledge about blood cell structure and viability (nucleus/organelles and living vs anucleate elements), which falls under Hematology rather than nursing care decision-making.

Question 39

What is the average lifespan of a normal RBC?

Accepted Answer

Answer reason: Normal erythrocytes circulate for about 120 days before being removed primarily by the spleen and liver. This lifespan reflects gradual membrane and enzyme deterioration in anucleate RBCs, which cannot synthesize new proteins to repair damage. The ~120-day survival is a key physiologic baseline used when interpreting hemolysis, anemia workups, and HbA1c (which depends on RBC age distribution). Therefore, 120 days is the best answer.
Category reason: This question tests foundational knowledge about red blood cell physiology and turnover, which is a core topic within Hematology rather than a nursing care decision.

Question 40

Which assessment findings are consistent with thrombocytopenia?

Accepted Answer

Answer reason: Thrombocytopenia (low platelet count) causes impaired primary hemostasis, leading to mucocutaneous bleeding manifestations. Classic assessment findings include petechiae (pinpoint nonblanching spots) and easy bruising/ecchymoses due to capillary bleeding. The other options include findings more consistent with anemia (pallor), liver disease (spider angiomas/jaundice), or respiratory issues (cyanosis, percussion dullness) rather than isolated low platelets.
Category reason: The question tests recognition of clinical manifestations of a platelet disorder (bleeding signs) rather than nursing interventions or prioritization, which aligns best with Hematology.

Question 41

Which blood component is primarily responsible for clotting?

Accepted Answer

Answer reason: Platelets (thrombocytes) are the key cellular component in primary hemostasis: they adhere to injured endothelium, aggregate, and form the initial platelet plug. They also provide a phospholipid surface that accelerates the coagulation cascade to generate fibrin, stabilizing the clot. Red blood cells mainly carry oxygen, and white blood cells mediate immune defense. Plasma contains clotting factors, but the primary formed element driving clot initiation at the injury site is the platelet.
Category reason: This question tests foundational knowledge of blood components and hemostasis (clotting), which is a core topic within hematology rather than a nursing intervention or prioritization scenario.

Question 42

Platelets are formed in?

Accepted Answer

Answer reason: Platelets are produced in the bone marrow by fragmentation of megakaryocyte cytoplasm (thrombopoiesis). RBCs are a separate blood cell line and do not generate platelets. The spleen primarily serves as a site of platelet sequestration and destruction rather than formation. Therefore, bone marrow is the correct site of platelet formation.
Category reason: This question tests where blood components (platelets) are produced, which is core knowledge of hematopoiesis within Hematology rather than a nursing intervention/decision-making scenario.

Question 43

Normal bleeding time is?

Accepted Answer

Answer reason: Bleeding time primarily assesses primary hemostasis (platelet function and small-vessel integrity). The commonly taught normal range (e.g., Ivy method) is about 2–7 minutes. Shorter ranges like 1–3 minutes are not the standard reference, while 10–15 and 20–30 minutes are clearly prolonged and suggest platelet dysfunction (e.g., thrombocytopenia, von Willebrand disease) or drug effects such as aspirin.
Category reason: This is a foundational laboratory/hemostasis reference range question about platelet-related bleeding time, which falls under Hematology rather than nursing judgment or interventions.

Question 44

Leukemia is a cancer of?

Accepted Answer

Answer reason: Leukemia is a malignancy of blood-forming tissues, characterized by uncontrolled proliferation of abnormal leukocytes in the bone marrow with spillover into the peripheral blood. Because it primarily involves circulating blood cells and hematopoietic tissue, it is classified as a cancer of the blood. While it originates in bone marrow, the disease entity is hematologic rather than a cancer of solid organs like brain or uterus.
Category reason: The question tests foundational knowledge of what tissue/system leukemia affects, which is core hematology content rather than nursing interventions or clinical prioritization.

Question 45

What is the minimum hemoglobin level required for blood donation?

Accepted Answer

Answer reason: Most standard blood-donation eligibility criteria require a minimum hemoglobin of about 12.5 g/dL to reduce the risk of causing or worsening donor anemia after collection. This threshold helps ensure adequate oxygen-carrying capacity and iron reserves for safe donation. While some organizations also use hematocrit cutoffs or sex-specific criteria, 12.5 g/dL is the commonly taught minimum value in basic hematology and donor screening.
Category reason: This question tests a factual eligibility cutoff related to hemoglobin and donor screening, which is primarily a hematology laboratory/clinical parameter rather than a nursing judgment or intervention scenario.

Question 46

Hemoglobin is the component of?

Accepted Answer

Answer reason: Hemoglobin is the iron-containing protein found inside red blood cells (RBCs) and is responsible for oxygen transport (and some carbon dioxide transport). Mature RBCs are essentially packed with hemoglobin to maximize gas-carrying capacity. White blood cells (including neutrophils) and platelets do not contain hemoglobin as their defining intracellular component.
Category reason: The item tests foundational knowledge of blood components and where hemoglobin is found, which is a core Hematology concept rather than a nursing care decision.

Question 47

Examination of peripheral blood smear revealed 12 nucleated erythrocytes per 100 leukocytes. Which histogram observation correlates with this finding?

Accepted Answer

Answer reason: Nucleated red blood cells (NRBCs) can be misclassified by automated analyzers as white blood cells, especially in the low-volume region where lymphocytes are counted. This creates an artifactual increase and distortion of the lymphocyte cluster on the WBC histogram, typically showing an abnormal start (not returning to/starting at baseline). Therefore, an abnormal lymphocyte population beginning above baseline on the leukocyte histogram best correlates with the presence of NRBCs. The other options describe changes more consistent with true granulocyte shifts, RBC size distribution changes, or platelet size abnormalities rather than NRBC interference in the WBC histogram.
Category reason: The question tests interpretation of automated hematology analyzer histograms and the effect of nucleated erythrocytes on WBC counting, which is a laboratory hematology concept rather than a nursing intervention or clinical prioritization scenario.

Question 48

Patient presents with Pallor. On examination he is found Jaundiced with Splenomegaly. His blood film shows round RBCs and low Hb. Diagnostic test is?

Accepted Answer

Answer reason: Pallor, jaundice, splenomegaly, and a blood film with round RBCs (spherocytes) suggest hereditary spherocytosis, a hemolytic anemia due to RBC membrane defects. The classic screening/diagnostic test is increased osmotic fragility, because spherocytes have reduced surface area-to-volume ratio and lyse more readily in hypotonic solutions. Coombs testing is used to confirm autoimmune hemolytic anemia, which can also cause spherocytes, but the stem favors hereditary spherocytosis by emphasizing round RBCs with splenomegaly. Vitamin B12 deficiency causes macrocytosis and hypersegmented neutrophils rather than round spherocytes.
Category reason: This item tests recognition of a hematologic disorder from clinical features and peripheral smear morphology and selecting the correct confirmatory laboratory test, which is foundational hematology knowledge rather than nursing intervention/priority setting.

Question 49

Haemoglobin is present in?

Accepted Answer

Answer reason: Hemoglobin is the oxygen-carrying protein contained within red blood cells (erythrocytes). It is packaged inside RBCs to bind and transport oxygen and carbon dioxide efficiently. Plasma and serum are the liquid components of blood and normally do not contain hemoglobin unless hemolysis has occurred. WBCs contain nuclei and immune-related components, not hemoglobin.
Category reason: This question tests where a key blood protein is located within blood components, which is a foundational concept of blood cell composition and function, fitting Hematology.

Question 50

Leukemia is a disease of?

Accepted Answer

Answer reason: Leukemia is a malignancy of the blood-forming tissues characterized by uncontrolled proliferation of abnormal leukocytes (white blood cells) and their precursors in the bone marrow. This leads to elevated or dysfunctional WBCs and crowding out of normal hematopoiesis, causing anemia and thrombocytopenia. Therefore, it is primarily a disease of WBCs.
Category reason: The question tests foundational knowledge of blood disorders—specifically which blood cell line is involved in leukemia—which falls under Hematology rather than nursing care decision-making.

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