Erythroid cells

Erythroid cells are cells in the blood-forming lineage that develops through erythroblast and reticulocyte stages into red blood cells.

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Erythropoiesis: Erythropoiesis is the production and maturation of red blood cells from hematopoietic stem cells. This broader process organizes the stages that define the erythroid lineage.
Hematopoietic stem cell: A hematopoietic stem cell is a self-renewing bone marrow cell capable of producing all blood cell lineages. Erythroid cells ultimately descend from this multipotent blood-forming source.
Complete blood count: A complete blood count is a laboratory test measuring blood cell numbers and several red cell indices. Its red cell measurements summarize the output of erythroid development.
Leukocyte: A leukocyte is a white blood cell involved in immune defense and other protective functions. Leukocytes arise from blood-forming precursors but follow a lineage distinct from erythroid cells.
Erythroblast: An erythroblast is a nucleated precursor that synthesizes hemoglobin during red blood cell development. Erythroblasts are the recognizable nucleated stages within this lineage.
Common myeloid progenitor: A common myeloid progenitor is a blood-forming precursor that can generate erythroid, megakaryocyte, granulocyte, and monocyte lineages. It represents an early branch point toward erythroid commitment.
Reticulocyte count: A reticulocyte count measures the proportion or number of immature red blood cells in blood. It estimates how actively the erythroid lineage is supplying new cells.
Megakaryocyte: A megakaryocyte is a large bone marrow cell that releases platelets by shedding cytoplasmic fragments. Megakaryocytes share an early progenitor branch with erythroid cells but produce platelets.
Reticulocyte: A reticulocyte is an immature red blood cell that has expelled its nucleus but retains residual RNA. Reticulocytes mark the transition from marrow precursors to circulating red cells.
BFU-E: A burst-forming unit-erythroid is an early erythroid progenitor that forms large colonies in culture. BFU-E cells precede more committed erythroid progenitors.