---
title: "Sed Rate (ESR) by Modified Westergren Test: What It Measures"
description: "It measures inflammation indirectly by how fast red blood cells settle, with convenient ordering and Quest-based lab testing through Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/sed-rate-by-modified-westergren"
last-updated: 2026-08-22
---

# Sed Rate (ESR) by Modified Westergren Test: What It Measures

> It measures inflammation indirectly by how fast red blood cells settle, with convenient ordering and Quest-based lab testing through Vitals Vault.

---

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