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What is Neutropenia?

Neutropenia is an abnormally low number of neutrophils in the blood. In babies, the most common cause of neutropenia is infection. Low levels of neutrophils occur when the bone marrow can not replace them as fast as they are being used.


A complete blood count (CBC) of a lab sample to determine how many and what types of red cells and white cells are in the blood.


The source of the infection is identified and treated. In rare cases when the neutrophil count is low enough to be life threatening, the following treatments may be recommended:

  • Replacement (transfusion) of white blood cells using donated blood
  • Medicines to stimulate white blood cell production
  • Antibodies from donated blood samples (intravenous immune globulin)