Neutrophils (NEUT#)

Your first-line defenders against bacterial infection.

What it is

Neutrophils are the most abundant white blood cells and the primary response against bacterial infections. Absolute neutrophil count (ANC) is the most clinically critical number for assessing infection risk during chemotherapy.

Why it matters

ANC below 0.5 ×10⁹/L defines febrile neutropenia — a medical emergency. Your oncologist will use ANC to determine whether your next chemo cycle is safe to proceed, and whether you need G-CSF (white cell stimulating injections) to support recovery.

How to test

Full blood count differential.

This information is for educational purposes only. Always discuss testing and interpretation of results with your care team.

Optimal range

Below 0.5 ×10⁹/L

severe neutropenia — infection emergency

1.8–7.5 ×10⁹/L

normal range

How often

Each cycle during chemotherapy. 7–14 days post-treatment to check nadir.