VVitals Vault
Sign in
Immunology

CD4/CD8 ratio

The CD4 count divided by the CD8 count.

Typical adult range 1–2.4
What it is

The CD4 count divided by the CD8 count.

Why it matters

It compresses both populations into one number, and a persistently low value is a recognised marker of immune ageing.

Reading the number

A ratio hides which half moved, so always read it with at least one of the counts. It dips for weeks after any viral illness and then recovers.

What moves it
recent viral infectionchronic viral infectionagesteroid medication
Read alongside
CD4 T-cells (%)CD8 T-cells (%)CD4 T-cells (absolute)CD8 T-cells (absolute)
When to raise it

Worth discussing a value that stays low once you are well again.

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 CD4/CD8 ratio.

Índice CD4/CD8Razão CD4/CD8CD4/CD8

Track your cd4/cd8 ratio over time.

CD4/CD8 ratio 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.