---
title: "Free T3:Free T4 Ratio: What It Means"
description: "It estimates how much active thyroid hormone you have relative to storage hormone, and you can order and review it with Vitals Vault via Quest."
canonical: "https://www.vitalsvault.com/biomarkers/free-t3-free-t4-ratio"
last-updated: 2026-08-22
---

# Free T3:Free T4 Ratio: What It Means

> It estimates how much active thyroid hormone you have relative to storage hormone, and you can order and review it with Vitals Vault via Quest.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/free-t3-free-t4-ratio
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