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Questions and Answers
What is typically the first indicator of iron deficiency anemia in the serum?
Which of the following clinical features is associated with long-standing iron deficiency anemia?
Which laboratory finding is NOT typically associated with iron deficiency anemia?
What is a neurobehavioral complication associated with iron deficiency anemia?
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Which dietary deficiency is NOT directly linked to megaloblastic anemia?
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Which statement best describes microcytic hypochromic anemia?
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What metabolic defect is primarily involved in the pathogenesis of megaloblastic anemia?
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Which characteristic finding is seen in peripheral smears of iron deficiency anemia?
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What percentage of functional body iron is typically found in hemoglobin?
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What is the primary cause of iron deficiency anemia in the Western world?
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Which storage iron component is NOT included in the normal iron storage pool?
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What is the average serum iron level in women?
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How much daily iron is typically lost through shedding of epithelial cells?
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What is the typical daily iron intake from a normal Western diet?
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What is one significant factor contributing to iron deficiency in developing countries?
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Which condition can result in malabsorption of iron?
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What is a common manifestation of thrombocytopenia?
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Which condition is characterized by extensive infiltration of the marrow by tumors or other lesions?
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What indicates hemolytic anemia based on erythroid activity?
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What condition can result from neutropenia?
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Which of the following conditions is NOT typically associated with myelophthisic anemia?
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What can be a complication of severe hemolytic anemias?
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What laboratory finding suggests myelophthisic anemia?
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What is the primary treatment strategy for myelophthisic anemia?
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What does MCV stand for in the context of red blood cell indices?
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Which index measures the average mass of hemoglobin per red cell?
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How is MCHC expressed in terms of measurement?
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What does RDW indicate about red cells?
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Which of the following is NOT a serum iron index?
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Which test evaluates the concentration of bilirubin in plasma?
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What does hemoglobin electrophoresis primarily assess?
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Which index describes the variation of red cell volume?
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Which of the following conditions can lead to vitamin B12 deficiency?
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What is a characteristic clinical feature of pernicious anemia?
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What is the most common form of anemia in hospitalized patients?
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What laboratory finding is associated with vitamin B12 deficiency?
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Which of the following is a cause of aplastic anemia?
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What is a potential risk associated with pernicious anemia?
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What pathological mechanism contributes to anemia of chronic inflammation?
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Which condition is characterized by moderate to severe macrocytic anemia?
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Study Notes
Red Blood Cell Indices
- Mean Cell Volume (MCV): Average volume of red blood cells, measured in femtoliters.
- Mean Cell Hemoglobin (MCH): Average mass of hemoglobin per red blood cell, expressed in picograms.
- Mean Cell Hemoglobin Concentration (MCHC): Average hemoglobin concentration in a volume of packed red cells, measured in grams per deciliter.
- Red Cell Distribution Width (RDW): Coefficient of variation of red cell volume, indicating size variability.
Diagnostic Blood Tests for Anemia
- Serum iron indices include iron levels, iron-binding capacity, transferrin saturation, and ferritin concentrations.
- Plasma unconjugated bilirubin, haptoglobin, and lactate levels aid in diagnosis.
- Measurements of serum and red cell folate, and vitamin B12 concentrations are essential.
- Hemoglobin electrophoresis and Coombs test help determine type of anemia.
- Clinical symptoms include weakness, pallor, dyspnea, thrombocytopenia, and potential infections due to neutropenia.
Myelophthisic Anemia
- Caused by extensive bone marrow infiltration by tumors or lesions (e.g., metastatic breast or prostate cancer, tuberculosis).
- Symptoms include anemia, thrombocytopenia, and possible leukoerythroblastosis.
- Treatment aimed at addressing the underlying condition.
Hemolytic Anemia
- Results from accelerated red blood cell destruction, causing increased erythropoietin and reticulocyte release from bone marrow.
- Characterized by erythroid hyperplasia and possible extramedullary hematopoiesis in organs like liver and spleen.
- Can be categorized as intrinsic (intracorpuscular) or extrinsic (extracorpuscular).
Iron Deficiency Anemia
- Primary cause in the Western world is chronic blood loss, commonly from gastrointestinal and female genital tract sources.
- In developing nations, diet deficiency and low bioavailability are major causes, impacted by vegetarian diets.
- Increased demand for iron occurs during pregnancy and infancy, and malabsorption syndromes can exacerbate deficiency.
- Clinical features include weakness, pallor, and "spooning" of nails; diagnosis relies on hypochromic/microcytic indices and low ferritin.
Anemia of Diminished Erythropoiesis
- Caused by insufficient dietary supply of iron, folate, and vitamin B12, as well as conditions like aplastic anemia or bone marrow infiltration.
- Megaloblastic anemias linked to inadequate DNA synthesis have distinct cell abnormalities.
Clinical Features of Megaloblastic Anemia
- Symptoms may include mild jaundice and neurological issues such as numbness and tingling.
- Diagnosis involves low serum vitamin B12 levels, normal/elevated serum folate, and macrocytic anemia with hypersegmented granulocytes.
Anemia of Chronic Inflammation
- Most common in hospitalized patients, often due to suppression of erythropoiesis from systemic inflammation.
- Associated chronic conditions include infections, immune disorders, and various neoplasms.
- Treatment focuses on managing the underlying disease.
Aplastic Anemia
- Characterized by suppression of multipotent myeloid stem cells, leading to bone marrow failure (pancytopenia).
- Pathogenesis can be due to immune-mediated suppression and intrinsic stem cell abnormalities, affecting individuals of all ages.
Iron Metabolism Facts
- Normal body iron mass is approximately 2.5g in women and 3.5g in men; 80% of iron is found in hemoglobin.
- Iron is transported via transferrin and is 33% saturated with iron; normal serum iron levels are around 120 µg/dL in men and 100 µg/dL in women.
- Daily dietary iron intake averages 10-20mg, with heme iron being more absorbable than nonheme iron.
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Description
Test your knowledge on the characteristics and indices of red blood cells. This quiz covers topics such as Mean Cell Volume (MCV) and how to assess red cell size, color, and shape through visual inspection. Perfect for students learning about hematology.
