Rare diseases · Sign or symptom

Abnormal factor IX activity

HP:0033062

What it means

Abnormal activity of coagulation factor IX. Factor IX, which itself is activated by factor Xa or factor VIIa to form factor IXa, activates factor X into factor Xa.

Part of the broader category

Abnormal factor IX activity

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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.