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Neutrophils are the most common of the white cells (60-70%). Neutrophils in circulation are mostly mature cells and are involved primarily in fighting infections. Immature Neutrophils, also called bands, appear with severe infections when there is recruitment of neutrophils mature and immature cells in a massive scale. When there are more than 10% immature neutrophils in circulation it is called bandemia.

High Neutrophil counts are seen in:
– Infections such as pneumonia
– Inflammation
– Smoking
– Medications such as steroids, lithium
– Exercise / Stress
– Leukemia/Cancer

Low Neutrophil counts are seen in:
– After infections with bacteria or viruses
– Medications such as Cancer drugs
– Immune related such as in Systemic Lupus
– Vitamin Deficiency such as Vitamin B12 deficiency
– Leukemia / Cancer