Page 64 - Clinical Hematology Atlas

48 SECTION TWO HEMATOPOIESIS

PROMYELOCYTE (PROGRANULOCYTE)

Cytoplasm
with primary
granules

Nucleus

Nucleoli
B
FIGURE 5–4B Schematic of promyelocyte.

A
FIGURE 5–4A Promyelocyte.

SIZE: 14-24 mm (slightly larger than myeloblast)
NUCLEUS: Round to oval
Nucleoli: 1-3 or more
Chromatin: Fine, but slightly coarser than
myeloblast
Cytoplasm: Basophilic
Granules:
Primary: .20 to many; their color is red to
purple or burgundy
Secondary: None
N/C RATIO: 3:1
REFERENCE INTERVAL:
Bone Marrow: 2% to 5%
Peripheral Blood: 0%

C
FIGURE 5–4C Electron micrograph of
promyelocyte (313,000).