Last updated: Friday, 21, January, 2011
CausesAppropriate Tests

Review clinical features, FBC, blood film, differential WCC.

See also Table 4 Reference intervals for leucocyte differential counts and Neutrophilia, with early myeloid cells (blood film)


  • Physical stress/vigerous exercise
  • Emotional stress
  • Pregnancy

Infection, especially 

  • Bacterial
  • Rickettsial
  • Viral (occasionally) e.g. chickenpox, herpes simplex

Microscopy and culture of local lesion, body fluid, or blood, as appropriate.

Other inflammation, especially


See Rheumatoid Arthritis (juvenile)

Tissue necrosis, especially

Blood loss (acute)

Myeloproliferative disorders

Splenic atrophy/absence

Drug therapy, especially

  • Corticosteroids
  • Cytokines


Cytokines (eg, G-CSF, GM-CSF) commonly cause neutrophilia and/or monocytosis.

  • Clozapine
  • Lithium

Cigarette smoking