Skip to content
Use your HSA or FSA funds

Trait

Increased red blood cell count

An abnormal elevation above the normal number of red blood cells per volume in the circulation.

HPO HP:0020059

Summary

Also called
Increased RBC count
Body system
Abnormality of blood and blood-forming tissues

1 gene linked to Increased red blood cell count

Changes in these genes cause rare conditions in which Increased red blood cell count is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.

GeneHow often it is seenConditions
HBBhemoglobin subunit betaVery often (80–99%)In 1 condition

How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.

Broader traits

Abnormal red blood cell count

Where this comes from

  • The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
  • Data release 2026.10.16-c6eea6bf.

One test. A lifetime of answers.

From $449Free shipping · Results in 6–8 weeks

Get my Genome Test