Lymphocytes (Lymph#)

Adaptive immune cells — critical for antitumour immunity.

What it is

Lymphocytes include T cells, B cells, and NK (natural killer) cells. They coordinate the adaptive immune response, including immune surveillance against tumour cells. Absolute lymphocyte count (ALC) reflects immune competence.

Why it matters

Chemotherapy and other treatments deplete lymphocytes. Persistent lymphopenia (low lymphocyte count) signals compromised immunity and is associated with worse outcomes. ALC recovery after treatment is a meaningful prognostic indicator.

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 0.8 ×10⁹/L

lymphopenia — immune function compromised

1.0–4.8 ×10⁹/L

normal range

How often

Each chemotherapy cycle.