---
title: "Carbon Dioxide (CO2) Blood Test: What It Measures"
description: "It measures blood bicarbonate to reflect your acid–base balance and ventilation status, with convenient ordering and Quest draw access via Vitals Vault."
canonical: "https://www.vitalsvault.com/biomarkers/carbon-dioxide"
last-updated: 2026-08-22
---

# Carbon Dioxide (CO2) Blood Test: What It Measures

> It measures blood bicarbonate to reflect your acid–base balance and ventilation status, with convenient ordering and Quest draw access via Vitals Vault.

---

Canonical HTML: https://www.vitalsvault.com/biomarkers/carbon-dioxide
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