Neutrophils (%)
Neutrophils (%) is the proportion of your white blood cells that are neutrophils, the most abundant type of immune cell. It's part of the white blood cell differential, which breaks the total count into its subtypes.
Neutrophils are your immune system's rapid responders, especially against bacterial infections, so their share of white cells shifts noticeably when your body is under attack. The percentage helps clinicians see where the balance of your immune response lies.
An above-range neutrophil percentage often reflects an active bacterial infection, inflammation, physical stress, or recent strenuous activity, and can follow certain medications like steroids. Because it's a proportion, it's best read together with the absolute neutrophil count.
A below-range percentage can appear with some viral infections or when neutrophils are reduced overall, which may leave you more susceptible to infection.
Neutrophils typically make up roughly 40-70% of white cells in adults, but percentages shift with the rest of the differential. Interpret them together with the absolute count and your clinician's guidance.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.