Neutrophils are a type of white blood cell. When there are too many of them circulating in the blood, a doctor may diagnose a person with neutrophilia. Neutrophilia is a fairly common symptom of many conditions and presents in almost all infections. It's possible for a person to have elevated neutrophils without knowing or ever being tested. However, if testing reveals elevated neutrophils, it's important to discover the underlying cause in case the patient requires medical intervention.
Neutrophils are an essential part of the immune system and make up between 40 and 70 percent of white blood cells in mammals. Humans make around 100 billion of these cells each day because they only live for eight hours. Neutrophils are unique among white blood cells because they can move through the walls of veins into cells.
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