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Proliferative disorders
An increase in the number of white blood cells in circulation is called leukocytosis.[1] This increase is most commonly caused by inflammation.[1] There are four major causes: increase of production in bone marrow, increased release from storage in bone marrow, decreased attachment to veins and arteries, decreased uptake by tissues.[1] Leukocytosis may affect one or more cell lines and can be neutrophilic, eosinophilic, basophilic, monocytosis, or lymphocytosis.
Neutrophilia
Neutrophilia is an increase in the absolute neutrophil count in the peripheral circulation. Normal blood values vary by age.[2] Neutrophilia can be caused by a direct problem with blood cells (primary disease). It can also occur as a consequence of an underlying disease (secondary). Most cases of neutrophilia are secondary to inflammation.[3]
Primary Causes[4]
- Conditions with normally functioning neutrophils - hereditary neutrophilia, chronic idiopathic neutrophilia
- Pelger-Huet Anomaly
- Down syndrome
- Leukocyte adhesion deficiency
- Familial cold urticaria
- Leukemia (chronic myelogenous (CML)) and other myeloproliferative disorders
- Surgical removal of spleen
Secondary Causes[5]
- Infection
- Chronic inflammation - especially juvenile rheumatoid arthritis, rheumatoid arthritis, Still's disease, Crohn's disease, ulcerative colitis, granulomatous infections (for example, tuberculosis), and chronic hepatitis
- Cigarette smoking - occurs in 25-50% of chronic smokers and can last up to 5 years after quitting
- Stress - exercise, surgery, general stress
- Medication induced - corticosteroids (for example, prednisone, β-agonists, lithium
- Cancer - either by growth factors secreted by the tumor or invasion of bone marrow by the cancer
- Increased destruction of cells in peripheral circulation can stimulate bone marrow. This can occur in hemolytic anemia and idiopathic thrombocytopenic purpura
Eosinophilia
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