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Immunology

CD8 T-cells (%)

The share of your lymphocytes that are CD8 cytotoxic T-cells, the population that kills virus-infected cells.

Unit %Typical adult range 20–36 %
What it is

The share of your lymphocytes that are CD8 cytotoxic T-cells, the population that kills virus-infected cells.

Why it matters

It rises during and after viral infections, which is most of what moves the CD4/CD8 ratio.

Reading the number

A percentage of lymphocytes. A raised value weeks after a viral illness is expected and settles slowly.

What moves it
recent viral infectionchronic viral infectionagestress
Read alongside
CD8 T-cells (absolute)CD4/CD8 ratioLymphocytes
When to raise it

Worth reading with the CD4 values rather than alone.

Tracking only, not a diagnosis. The range above is a typical adult reference range — the range printed by the lab that ran your test is the one that applies to you. Discuss anything that concerns you with your doctor.

Also known as

On a report in another language.

A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under CD8 T-cells (%).

T8 [CD3/CD8]CD8T8 CD3/CD8CD8 %

Track your cd8 t-cells (%) over time.

CD8 T-cells (%) is one of 165 analytes Vitals Vault charts over time. Import a lab report in any language and this number lands on a timeline only you can read.

Continue with Google
Tracking only. This app is not medical advice. Always discuss results and future analysis with your doctor.

Catalog entry last updated 2026-08-28. Browse all 165 metrics.