Rare diseases · Sign or symptom

Abnormal circulating T4 concentration

HP:0031505

What it means

A deviation from the normal concentration of thyroxine in the blood. Thyroxine (also known as T4) is the main hormone secreted by the thyroid gland into the blood. It can be converted into the active form triiodothyronine (also known as T3).

Part of the broader category

Also called: Abnormal circulating T4 level · Abnormal circulating thyroxine level

Abnormal circulating T4 concentration

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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.