---
title: "Casein IgG4 Test: What It Measures & What Results Mean"
description: "It measures IgG4 antibodies to casein to support food-sensitivity discussions, with easy ordering and Quest lab access through Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/casein-igg4"
last-updated: 2026-08-22
---

# Casein IgG4 Test: What It Measures & What Results Mean

> It measures IgG4 antibodies to casein to support food-sensitivity discussions, with easy ordering and Quest lab access through Vitals Vault.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/casein-igg4
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