Rare diseases · Sign or symptom

Reduced antithrombin antigen

HP:0040246

What it means

Reduced antithrombin antigen. A reduced level of antithrombin may lead to an increased risk of thrombus formation.

This term has been requested and created by members of the BRIDGE consortium

Rare diseases that can present with this4

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

Reduced antithrombin antigen

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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.