RBC Lineage
Overall, the size of an RBC decreases as it matures. Chromatin becomes more coarse and clumped as it becomes less transcriptionally active. The cytoplasm will also become pinker with more Hgb being formed and less blue due to decreased RNA. The nucleus will shrink in size until it is ejected and becomes a reticulocyte.
Pronormoblast (rubriblast)
Cytoplasm is dep blue with perinuclear hof. Nucleoli present.
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Basophilic Normoblast (Prorubricyte)
Cytoplasm is deep blue and may have perinuclear hof. Nucleoli usually not present.
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Polychromatophilic Normoblast (Rubricyte)
Nucleus is smaller than precursors with much clumpier chromatin forming cartwheel or checkerboard appearance. Cytoplasm is bluish-gray or pinkish-gray.
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Orthochromatic Normoblast (Metarubricyte)
Last stage before losing nucleus. Cytoplasm is pink. Nucleus is fully condensed, staining densely blue/purple.
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Polychromatophilic Erythrocyte (Reticulocyte)
Nucleus is absent. Cytoplasm is blue-tinged. Cell is slightly larger than fully mature RBC. Can be identified with New Methylene Blue Stain. Residual RNA may cause very fine dust-like stippling.
For more images, see RBC Morphology
Mature Erythrocyte
Cytoplasm is pink with zone of central pallor. Cell is about the size of a lymphocyte nucleus.
For more images, see RBC Morphology
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