An arterial blood gas (ABG) test measures the acidity and the levels of oxygen and carbon dioxide in the blood from the artery. This test is used to evaluate how well the lungs are able to move oxygen into the blood and to remove carbon dioxide from the blood. The oxygen and carbon dioxide levels of the blood and the pH balance of the blood can indicate the presence of certain medical conditions, such as cardiac, lung or kidney disorders and the presence of other critical conditions such as:
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