---
title: "Free T4 Index (T7) Test: What It Measures, What Results Mean"
description: "It estimates how much active thyroid hormone is available in your blood and helps clarify confusing thyroid labs, with easy ordering through Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/free-t4-index-t7"
last-updated: 2026-08-22
---

# Free T4 Index (T7) Test: What It Measures, What Results Mean

> It estimates how much active thyroid hormone is available in your blood and helps clarify confusing thyroid labs, with easy ordering through Vitals Vault.

---

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