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An arterial blood gas (ABG) test measures the acidity (pH) and the levels of oxygen and carbon dioxide in the blood from an artery. The test is commonly known as a blood gas analysis or arterial blood gas (ABG) test. An ABG is a blood test that measures the acidity, or pH, and the levels of oxygen ( O2) and carbon dioxide (CO2) from an artery. What is this test? An arterial blood gas analysis (ABG) measures the balance of oxygen and carbon dioxide in your blood to see how well your lungs are working. What Is an Arterial Blood Gas Test (ABG)?. A blood oxygen level test measures the amount of oxygen and.