---
title: "Vitamin B12 (Cobalamin) Test: What It Measures"
description: "A vitamin B12 test measures circulating cobalamin to assess deficiency risk and anemia/neuropathy clues, with convenient Quest lab ordering via Vitals."
canonical: "https://www.vitalsvault.com/biomarkers/vitamin-b12-cobalamin"
last-updated: 2026-08-22
---

# Vitamin B12 (Cobalamin) Test: What It Measures

> A vitamin B12 test measures circulating cobalamin to assess deficiency risk and anemia/neuropathy clues, with convenient Quest lab ordering via Vitals.

---

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