ABG stands for Arterial Blood Gas. It is a blood test that measures the levels of oxygen and carbon dioxide in your blood, as well as your bloods pH balance. The test requires a sample from an artery in your body, usually from your wrist or groin area. An ABG test can help healthcare providers interpret conditions that affect your respiratory system, circulatory system, and metabolic processes, especially in emergency situations. The test is often used in emergency medicine, critical care, and respiratory therapy. It can also help diagnose and monitor conditions that affect your lungs and kidneys, as well as many other conditions that may upset your acid-base balance. An ABG test alone usually cant provide a final diagnosis, so if your results are not normal, your provider will likely order more tests to make a diagnosis.