---
title: "Thyroid Peroxidase (TPO) & Thyroglobulin (Tg) Antibodies Test: What It Measures & What Results Mean"
description: "It checks thyroid autoantibodies linked to Hashimoto’s and Graves’ risk, with clear next steps and convenient Quest lab access via Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/thyroid-peroxidase-and-thyroglobulin-antibodies"
last-updated: 2026-08-22
---

# Thyroid Peroxidase (TPO) & Thyroglobulin (Tg) Antibodies Test: What It Measures & What Results Mean

> It checks thyroid autoantibodies linked to Hashimoto’s and Graves’ risk, with clear next steps and convenient Quest lab access via Vitals Vault.

---

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