Neutrophils (count and %)

The normal reference range for Neutrophils (count and %) is Neutrophils are the most abundant white cell, typically about 2.0-7.5 x10^9/L. They are the front line against bacterial infection, so the count rises quickly with infection and inflammation.. Reference ranges may vary between laboratories, so always consult your healthcare provider for interpretation.

Important for evaluating immune function and detecting infection or inflammation.

A high neutrophil count (neutrophilia) is most commonly driven by bacterial infection, but it also rises with any inflammation or tissue damage, physical or emotional stress, vigorous exercise, smoking, pregnancy, and corticosteroid treatment. A markedly and persistently high count can reflect a myeloproliferative or other bone marrow disorder, prompting a blood film and further tests.

A low neutrophil count (neutropenia) raises the risk of bacterial infection when severe. Common causes include viral infections, chemotherapy and other medications, autoimmune disease, vitamin B12 or folate deficiency, and bone marrow disorders. A benign, harmless low count (benign ethnic neutropenia) is common in people of African and Middle Eastern descent and needs no treatment. A severely low count is a medical priority.

Neutrophils are reported in the differential of every full blood count. A high count with obvious infection needs no specific follow-up, while an unexplained or severely low count is investigated promptly and monitored — especially during chemotherapy, where regular counts guide treatment.