---
title: "25-Hydroxy & 1,25-Dihydroxy Vitamin D Test (Questassured)"
description: "It measures vitamin D storage (25-OH) and active hormone (1,25-OH2) to clarify deficiency vs metabolism issues, with Quest draw access via Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/questassured-25-hydroxy-and-calcitriol-125-dihydroxyvitamin-d"
last-updated: 2026-08-22
---

# 25-Hydroxy & 1,25-Dihydroxy Vitamin D Test (Questassured)

> It measures vitamin D storage (25-OH) and active hormone (1,25-OH2) to clarify deficiency vs metabolism issues, with Quest draw access via Vitals Vault.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/questassured-25-hydroxy-and-calcitriol-125-dihydroxyvitamin-d
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