Rare diseases · Sign or symptom
Polychromasia
HP:0034609
What it means
Increased variation in the color of the erythrocytes (red blood cells), including pale red, normal or dark colors, indicating a highly variable hemoglobin concentration. Typically this indicates the release of immature erythrocytes in states of anemia.
Rare diseases that can present with this1
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: Polychromasia on peripheral blood smear
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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.