---
title: "Nucleated RBC (NRBC) Test: What It Measures"
description: "It measures immature red blood cells in your bloodstream to flag marrow stress or severe illness, with easy ordering through Vitals Vault and Quest labs."
canonical: "https://www.vitalsvault.com/biomarkers/nucleated-rbc"
last-updated: 2026-08-22
---

# Nucleated RBC (NRBC) Test: What It Measures

> It measures immature red blood cells in your bloodstream to flag marrow stress or severe illness, with easy ordering through Vitals Vault and Quest labs.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/nucleated-rbc
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