---
title: "Collagen Type I C Telopeptide (CTX) Test: What It Measures"
description: "It measures bone breakdown activity to assess fracture risk and treatment response, with easy ordering and Quest lab access through Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/collagen-type-i-c-telopeptide-ctx"
last-updated: 2026-08-22
---

# Collagen Type I C Telopeptide (CTX) Test: What It Measures

> It measures bone breakdown activity to assess fracture risk and treatment response, with easy ordering and Quest lab access through Vitals Vault.

---

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