Neutrophils
Neutrophils are the most abundant type of white blood cell, typically comprising 40–70% of the WBC differential. They are the immune system's first responders, rapidly migrating to sites of bacterial infection and tissue injury.
Elevated neutrophils (neutrophilia) most commonly indicate bacterial infection, but can also result from stress, corticosteroid use, smoking, or inflammatory conditions. Low neutrophils (neutropenia) increase susceptibility to infection and can result from viral infections, autoimmune conditions, certain medications, or bone marrow disorders.
The neutrophil-to-lymphocyte ratio (NLR) has emerged as a valuable inflammatory and prognostic marker, with elevated NLR associated with worse outcomes in cardiovascular disease, cancer, and critical illness.
What It Measures
Absolute count and relative percentage of neutrophils in the white blood cell differential.
Reference Ranges
| Status | Range (K/uL) |
|---|---|
| Optimal | 2.0–5.0 K/uL (absolute) |
| Normal | 1.8–7.7 K/uL (absolute), 40–70% |
| Borderline | 1.0–1.8 K/uL |
| Out of Range | < 1.0 K/uL (neutropenia) or > 10.0 K/uL |
How GATOR Tracks This
Lab Providers
Related Clinical Ratios
Related Biomarkers
This content is for informational purposes only and does not constitute medical advice. Reference ranges may vary by laboratory and individual factors. Consult a qualified healthcare provider for interpretation of your results and treatment decisions.
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