Rare diseases · Sign or symptom
Increased circulating hemoglobin concentration
HP:0001900
What it means
Concentration of hemoglobin in the blood circulation above the upper limit of normal.
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: Increased haemoglobin · Increased haemoglobin concentration · Increased Hb · Increased Hb concentration · Increased hemoglobin · Increased hemoglobin concentration
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.