Anemias: Classification and Pathophysiology
Start with the big picture
The lesson organizes anemia into microcytic, normocytic, and macrocytic patterns using MCV, with reticulocyte response helping separate reduced production from blood loss or hemolysis in normocytic cases. Microcytic anemias share impaired hemoglobin synthesis; the material contrasts iron deficiency, chronic inflammation, thalassemia, and sideroblastic anemia through their mechanisms and characteristic laboratory or cell findings. It also introduces marrow failure and reduced erythropoietin as causes of impaired red-cell production, and distinguishes intravascular from extravascular hemolysis. Key examples include sickle cell disease, G6PD deficiency, and hereditary spherocytosis. The chapter headings also identify vitamin B12 and folate deficiency as macrocytic topics, providing a broader map of anemia evaluation.
What you'll learn
- Classify anemia using MCV and recognize the major cell-size categories.
- Relate microcytic anemia patterns to hemoglobin synthesis and characteristic laboratory findings.
- Use reticulocyte response to distinguish low production from blood loss or hemolysis.
- Differentiate intravascular from extravascular hemolysis using associated findings.
- Recognize key mechanisms in sickle cell disease, G6PD deficiency, and hereditary spherocytosis.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
