---
title: "Hemoglobin A1c (HbA1c) With eAG Test: What It Measures"
description: "It estimates your average blood sugar over ~3 months and converts it to eAG; order through Vitals Vault and test at a nearby Quest location."
canonical: "https://www.vitalsvault.com/biomarkers/hemoglobin-a1c-with-eag"
last-updated: 2026-08-22
---

# Hemoglobin A1c (HbA1c) With eAG Test: What It Measures

> It estimates your average blood sugar over ~3 months and converts it to eAG; order through Vitals Vault and test at a nearby Quest location.

---

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