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What is the test?
- Your red blood cells must carry sufficient oxygen through your arteries
to all of your internal organs to keep you alive. Normally, when red
blood cells pass through the lungs, 95%-100% of them are loaded, or "saturated," with
oxygen to carry. If you have lung disease or other types of medical
conditions, fewer of your red blood cells may be carrying their usual
load of oxygen, and your oxygen saturation might be lower than 95%.
Your blood oxygen level can be measured in two ways.
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