#261 ABG vs VBG Explained: Key Differences, Accuracy, and When to Use Each (Critical Care Guide)

Arterial blood gas (ABG) or venous blood gas (VBG)—which should you actually use in clinical practice?

In this episode, we break down the key differences between ABG and VBG in a clear, practical way so you can understand when each test is appropriate in emergency and critical care settings. While ABGs are often considered the gold standard, VBGs can provide clinically useful information in many situations—with less risk and greater ease.

We cover:

• What ABGs measure and how to interpret them
• What VBGs tell you and how they differ
• Key differences in pH, CO₂, lactate, and oxygenation
• The accuracy and limitations of VBG compared to ABG
• When a VBG is sufficient—and when an ABG is essential
• Common pitfalls in blood gas interpretation

This is a high-yield, bedside-focused discussion designed for medical students, residents, nurses, respiratory therapists, and physicians in emergency medicine and critical care.

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Disclaimer: This content is for educational purposes only and does not constitute medical advice. Clinical decisions should be made by licensed healthcare professionals using their clinical judgment, institutional protocols, and current evidence. Whiteboard Medicine assumes no responsibility for clinical outcomes.