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Erythropoiesis Information and Courses from MediaLab, Inc.

These are the MediaLab courses that cover Erythropoiesis and links to relevant pages within the course.

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CLIA Hematology / Hemostasis Review
Hypochromia can best be described as:View Page

Erythrocyte Inclusions - Wright Stained Smears
More on Howell-Jolly Bodies

Under normal conditions, Howell-Jolly bodies are thought to be remnants of nuclear fragments due to incomplete expulsion of the nucleus. In pathological conditions, they are aggregates of chromosomes which have separated from the mitotic spindle during abnormal mitosis. Single or multiple Howell-Jolly bodies may be found in a red cell. A single HJ body in a red cell may be seen in megaloblastic anemia, hemolytic anemia such as sickle cell anemia and after splenectomy. Megaloblastic anemia or abnormal erythropoiesis is usually present when multiple Howell-Jolly bodies are observed in a single cell.

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What are Cabot rings?

Thin, red-violet-staining strands in the shape of rings, figure eights, or shapes of the letter B may on rare occasions be seen in erythrocytes. These structures are called Cabot rings. Although the origin of Cabot rings continues to be illusive, they are not nuclear fragments since they test Feulgen negative. The rings are probably microtubules remaining from a mitotic spindle. Cabot rings have been observed in a few cases of megaloblastic anemia, lead poisoning and other disorders of erythropoiesis, as well as, after a splenectomy.

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White Cell and Platelet Disorders: Peripheral Blood Clues to Nonneoplastic Conditions
A most useful follow-up test to consider when faced with hypersegmented neutrophils and oval macrocytes (see photograph) in a peripheral blood smear is:View Page


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