WBC (White Blood Cell Count)

Your immune system's total troop count.

What it is

The total white blood cell count measures all immune cells circulating in the blood: neutrophils, lymphocytes, monocytes, eosinophils, and basophils. It is the first-line indicator of immune function and infection response.

Why it matters

Chemotherapy suppresses the bone marrow, causing WBC to fall — a condition called neutropenia. A low WBC increases infection risk dramatically. Monitoring WBC guides decisions about treatment timing, dose, and the need for growth factor support.

How to test

Full blood count (CBC). Routine, no fasting required.

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

Optimal range

Below 1.0 ×10⁹/L

severe — infection emergency risk

4.0–11.0 ×10⁹/L

normal range

Above 11.0 ×10⁹/L

elevated — may indicate infection or inflammation

How often

Each chemotherapy cycle nadir (7–14 days post-treatment). Every 6–12 weeks otherwise.