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Arterial blood gas (ABG) test - OBGYN Associates
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Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Arterial blood gas (ABG) test

An arterial blood gas (ABG) test measures the levels of oxygen and carbon dioxide in the blood to find out how well the lungs are working. An ABG test checks how well the lungs can move oxygen into the blood and remove carbon dioxide from the blood.

As blood passes through the lungs, oxygen moves into the blood while carbon dioxide moves out of the blood into the airspace of the lungs. An ABG test uses blood drawn from an artery, where the oxygen and carbon dioxide levels can be measured before they enter body tissues and become changed. An ABG test measures pH (acidity or alkalinity) and the levels of oxygen and carbon dioxide in the blood. Abnormal values for pH, oxygen, and carbon dioxide can be caused by changes in:

  • Lung function.
  • Heart function and blood flow.
  • Kidney function.
  • How well the body uses food for energy (metabolism).
  • The use of some medicines.

An arterial blood gas test is often done for a person who is in the hospital because of severe injury or illness.

Current as of: April 30, 2024

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.