Read the field before naming the pattern

Assess red-cell size and central pallor in the well-spread monolayer. Thick areas distort apparent size, staining, and pallor, while the thin feathered field can exaggerate central pallor. A small lymphocyte nucleus is a practical reference for the usual mature red-cell diameter of about 7 to 8 µm: on the same field and magnification, compare its diameter directly against neighboring red cells rather than relying on memory or a separate reference image.

A microcyte is smaller than a normal red cell and a macrocyte is larger. A macro-ovalocyte is a large oval red cell and should be described separately from a round macrocyte. Anisocytosis is increased variation in size, not a synonym for microcytosis, macrocytosis, or poikilocytosis. Name a specific abnormality when it is identified.

MCV is an average cell-volume index. RDW represents variation in red-cell volume and supports, but does not replace, the smear assessment. Small and large populations can coexist while the MCV remains in range. Use the monolayer and a reference cell to decide whether the shift is uniform or variable.