![]() ![]() Healthcare providers can measure your blood oxygen level as part of a larger test known as an arterial blood gas (ABG) test. A blood draw test provides much more information about your oxygen levels than an oximeter does. There are two main ways to measure or test blood oxygen levels: through a blood draw test and through pulse oximetry (using an oximeter). Low blood oxygen levels indicate that your lungs and/or circulatory system may not be working as they should. Your body tightly regulates the amount of oxygen saturation in your blood, because low blood oxygen levels ( hypoxemia) can lead to many serious conditions and damage to individual organ systems, especially your brain and heart. ![]() Your bloodstream then carries the carbon dioxide back to your lungs, and you breathe it out (exhale it) through your mouth or nose. Once your cells use oxygen, they create carbon dioxide. All of your cells need oxygen to create energy efficiently, and your body needs energy to fulfill all of its processes, such as digestion and even thinking. Once in your bloodstream, the oxygen then goes to cells all over your body. Oxygen enters your body through your nose or mouth when you breathe (inhale) and passes through your lungs into your bloodstream. Oxygen is essential to life, and our bodies need a certain amount of oxygen to function properly. Your blood oxygen level (blood oxygen saturation) is the amount of oxygen you have circulating in your blood. ![]()
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