Rare diseases · Sign or symptom
Increased total B cell count
HP:0005404
What it means
The absolute number of B cells in the blood, per microlitre is above the upper limit of normal of the reference range for the appropriate sex and age-group.
Rare diseases that can present with this2
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: B cell lymphocytosis · Increase in B cell count · Increase in B cell number · Increased number of B cells
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
Start free with EleplanThis 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.