Page 87 - Clinical Hematology Atlas

CHAPTER 7 EOSINOPHIL MATURATION 71

EOSINOPHILIC MYELOCYTE

B
A FIGURE 7–2B Electron micrograph of eosinophilic
FIGURE 7–2A Eosinophilic myelocyte.
granules to demonstrate crystalline structure
of granules.

SIZE: 12-18 mm
NUCLEUS: Round to oval; may have one flattened
side
Nucleoli: Usually not visible
Chromatin: Coarse and more condensed than
promyelocyte
CYTOPLASM: Colorless to pink
Granules:
Primary: Few to moderate
Secondary: Variable number; pale orange to
dark orange; round; appear refractile
N/C RATIO: 2:1 to 1:1
REFERENCE INTERVAL:
Bone Marrow: 0% to 2%
Peripheral Blood: 0%
NOTE: This chapter begins with the image of the
myelocyte, rather than the blast, because it is at
the myelocyte stage that secondary granules,
which define a cell as an eosinophil, first appear.