Rare diseases · Sign or symptom

Decreased total CD8+ T cell number

HP:5210425

What it means

Abnormal decrease of the absolute number of cytotoxic CD3+CD8+ T cells (measured the absolute count per volume or as percentage of total CD3+ T cells in the blood), compared to a reference range for a given sex and age-group. These are usually measured within the TCR alpha/beta positive population.

Part of the broader category

Decreased total CD8+ T cell number

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.