Neutrophils
Disclaimer: Information on this page is for educational purposes. Consult a physician to interpret your test results. Lissa Health helps track biomarker trends but does not replace medical advice.
What This Test Measures
Neutrophils are the most abundant white blood cells and the first responders to bacterial infections. They phagocytose pathogens and release inflammatory mediators.
Neutrophilia is typical of bacterial infections, stress, and glucocorticoid use. Neutropenia increases risk of severe infections, especially when absolute count falls below 0.5 × 10⁹/L.
The differential assesses both percentage and absolute neutrophil count (ANC) — the latter is more clinically relevant.
Normal Ranges
| Group | Reference Range |
|---|---|
| Men | 40–70% (1.8–7.7 × 10⁹/L) |
| Women | 40–70% (1.8–7.7 × 10⁹/L) |
| Children | 30–50% (age-dependent) |
Reference ranges may vary by laboratory and assay method.
Causes of High Levels
- Bacterial infections
- Physical/emotional stress
- Corticosteroids
- Smoking
- Myeloproliferative disorders
Causes of Low Levels
- Viral infections
- Chemotherapy, radiation
- Aplastic anemia
- Drug-induced neutropenia
- Autoimmune neutropenia
Test Preparation
- No preparation required
- Report fever and medications
Related Biomarkers
| Biomarker | Relationship |
|---|---|
| White Blood Cells | Total white blood cell count |
| Lymphocytes | Often change inversely |
| C-Reactive Protein (CRP) | Bacterial inflammation marker |
FAQ
How often should I take this test?
With infections and neutropenia — per physician schedule; with CBC — annually.
What should I do if my result is abnormal?
With neutropenia <1.0 × 10⁹/L, avoid infection exposure. Seek urgent care for fever.
Last updated: June 2026