Blood is withdrawn from a small artery and then analyzed by a special machine that records the amount of carbon dioxide (waste gas) and oxygen in the blood. This test can help determine whether or not one needs extra oxygen.
refers to the pressure of oxygen and/or carbon dioxide in arterial blood; abbreviated ABG. An 'ABG' test routinely measures pressures of both gases, along with the level of blood acidity.
a blood test that measures how well the body is using oxygen.