Neutrophil Count: Understanding High and Low Levels - Causes & Implications

Normal Range:

Adults: 2.5-7.5 x 10^9/L (2500-7500 cells/µL)

Children 1-12 years: 1.5-8.0 x 10^9/L (1500-8000 cells/µL)

Newborn: 9-30 x 10^9/L (9000-30,000 cells/µL)

High:

- Infection (bacterial)

- Chronic inflammatory disease (autoimmune disease)

- Tissue damage/necrosis

- Malignancies (acute leukemia, chronic myeloid leukemia)

- Splenectomy

- Steroid use

- Stress

Low:

- Viral infections

- Sepsis (very high or very low)

- Aplastic anemia

- Bone marrow failure

- Chemotherapy