For example, a reading of 90% oxygen saturation on an FDA-approved prescription machine could mean anything from 86% to 94%. If your levels are low, you may need to breathe in extra oxygen through a tube.īut a pulse oximeter reading is simply an estimate. This could be because there’s a problem with your heart or lungs. (Levels that get lower over time could suggest a serious health issue).Ī blood oxygen level lower than 89% means you may not have enough oxygen in your blood to meet your body's needs.
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