Overview
Granulopoiesis produces neutrophils through progressive nuclear indentation and granule development.
Classification
| Stage | Nucleus | Granules |
|---|---|---|
| Myeloblast | Round; fine chromatin | Agranular |
| Promyelocyte | Round/indented | Primary (azurophilic) granules |
| Myelocyte | Indented | Secondary granules appear |
| Metamyelocyte | Kidney-shaped | Mature granulation developing |
| Band | Horseshoe | Neutral granules |
| Segmented | Multilobed | Fine neutral granules |
Morphologic Features
Toxic granulation and Döhle bodies are reactive changes in mature neutrophils . Neutrophils module.
Laboratory Characteristics
- Manual band count per 100 WBCs
- IG parameter manufacturer-specific
Reference Intervals
Bands are a minority in health, thresholds for left shift are clinical and institutional.
Clinical and Laboratory Significance
- Left shift, accelerated granulopoiesis
- Blasts, not left shift; urgent pathway
Differential Considerations
Promyelocytes in peripheral blood are abnormal, not routine infection left shift.
Comparison Tables
Granulopoiesis vocabulary
| Term | Meaning |
|---|---|
| Left shift | ↑ immature neutrophilic forms |
| Band | Immature neutrophil before full segmentation |
| IG | Automated immature granulocyte fraction |
Classification Frameworks
Acute myeloid leukemia defined by blast thresholds, advanced module.
Laboratory Notes
- This table owns granulocytic maturation, do not duplicate in other lineage entries.
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Rodak BF, Carr JH. Rodak's Hematology: Clinical Principles and Applications. 6th ed. Elsevier; 2020.
- Hoffbrand AV, Moss PAH, Pettit JE. Essential Haematology. 8th ed. Wiley-Blackwell; 2019.
- McKenzie SB, Williams JL. Clinical Laboratory Hematology. 4th ed. Pearson; 2022.
Professional Monographs
- Barnes PW, McFadden SL, Machin SJ, Doig K. Laboratory Hematology Practice. Wiley-Blackwell; 2012.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
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