---
title: "Vitamin B1 (Thiamine) Plasma/Serum LC–MS/MS Test"
description: "It measures thiamine (vitamin B1) in your blood to help assess deficiency risk and monitoring, with easy ordering and Quest lab access via Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/vitamin-b1-thiamine-plasma-serum-lc-ms-ms"
last-updated: 2026-08-22
---

# Vitamin B1 (Thiamine) Plasma/Serum LC–MS/MS Test

> It measures thiamine (vitamin B1) in your blood to help assess deficiency risk and monitoring, with easy ordering and Quest lab access via Vitals Vault.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/vitamin-b1-thiamine-plasma-serum-lc-ms-ms
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