Neutrophil Count

Neutrophil count is the count of neutrophil white blood cells in a microliter (cubic millimeter) sample of peripheral blood.

Neutrophil makes up the highest count of normal white blood cell count, except at early childhood. Infants are born with the highest neutrophil count, normal Neutrophil count of newborns is 8870 cells/µL. Within the first 2 weeks after birth, the Neutrophil count drops dramatically and then it starts to increase again to reach 3700 cells/µL.

In early childhood, the Lymphocytes count increases to exceed the Neutrophils count, then the Lymphocytes count will start decreasing by aging leaving the majority to the Neutrophil again.

High Neutrophil count or Neutrophilia is defined as the neutrophil count greater than 7,500 cells per microliter.

Since Neutrophil count is the highest in the normal white blood cell count, alternations in the Neutrophil count would affect the total white blood cells count. It is understood that a noticeable alternation in the white blood cells count usually happens because of an alternation of the Neutrophil count.

High Neutrophil can occur as a result of the general causes of Leukocytosis such like physical stress and exposure to the sunlight.

Neutrophil is responsible in fighting pyogenic bacteria (Bacteria that cause Pus). An increase in the neutrophil usually occurs when fighting pyogenic infections.

The immune system tents to produce very high numbers in of neutrophil in an inflammation. Nonsegmented or band neutrophils (immature cells) can be found in blood as a part of the total increase in the neutrophil. These immature band cells have a short life span and when their count starts to decrease this would be a sign that the infection is being subsided.

Leukemoid reaction is another case of Neutrophilia where the count of the Neutrophil exceeds 30,000 cells/µL. The Neutrophils in this case are usually mature, but immature cells can even be seen with earlier stages cells and even with Myeloblast in rare cases.

Neutrophilic Leukocytosis (Neutrophilia) can also occur in conditions such like:

  • Cancer.
  • Burns.
  • Hemorrhage.
  • Hemolysis.
  • Tissue necrosis.