Lab
Monocyte Count
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Monocyte Count
, Monocyte, Macrophage
See Also
Complete Blood Count
Immune System
Characteristics
Forms in
Bone Marrow
from
Myeloblast
s as with other
Granulocyte
s (
Basophil
s,
Eosinophil
s,
Neutrophil
s)
Function:
Phagocytosis
of dead or damaged cells (similar to
Neutrophil
s)
Monocytes move from peripheral blood into tissue and become Macrophages
Transformation to Macrophages controlled by
Cytokine
s
Macrophages directly perform the
Phagocytosis
Monocyte Morphology on Blood Smear
Mononuclear
Leukocyte
(same class as
Lymphocyte
)
Slightly larger than a
Lymphocyte
Kidney
shaped nucleus
Macrophages have specific names in certain tissues
Osteoclast
(Bone)
Mesangial Cell (
Kidney
)
Langerhans Cell
(Skin)
Alveolar Macrophage (lung)
Microglia (
Central Nervous System
)
Kuppfer Cell (
Liver
)
Labs
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
Glucocorticoid
s
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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