Lab
Monocyte Count
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Monocyte Count
, Monocyte, Macrophage
See Also
Complete Blood Count
Characteristics
Forms in
Bone Marrow
from
Myeloblast
s as with other
Granulocyte
s (
Basophil
s,
Eosinophil
s,
Neutrophil
s)
Function: Phagocytizes dead or damaged cells
Monocytes move into tissue and become Macrophages
Transformation to Macrophages controlled by cytokines
Macrophages directly perform the phagocytosis
Monocyte Morphology on Blood Smear
Mononuclear
Leukocyte
(same class as
Lymphocyte
)
Slightly larger than a
Lymphocyte
Kidney
shaped nucleus
Interpretation
Normal
Range: 2-8% of
White Blood Cell
s
Causes
Increased
Infection
Viral Infection
Parasitic Infection
Inflammatory Bowel Disease
Sarcoidosis
Neoplasms
Monocytic
Leukemia
Lymphoma
Multiple Myeloma
Causes
Decreased
Aplastic Anemia
Lymphocytic
Anemia
Glucocorticoids
Evaluation
Monocytosis (Monocytes >880/mm3)
See
Leukocytosis
History and potential causes
Travel and contagious contacts
Diagnostics (consider)
Chest XRay
Specific infection testing (e.g.
Monospot
, PPD or quantiferon)
Acute phase reactants (ESR, CRP)
References
Saiki in Friedman (1991) Medical Diagnosis, p. 227
Abramson (2000) Am Fam Physician 62(9):2053-60 [PubMed]
Riley (2015) Am Fam Physician 92(11):1004-11 [PubMed]
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