![]() In just a few seconds, the device will show your heart rate and oxygen saturation level - the percentage of your red blood cells carrying oxygen. The pulse oximeter uses a special type of light to see how much oxygen is in the red blood cells traveling through the blood vessels under your skin. Or they’ll put a sticky disposable probe on your finger, nose, toe, or forehead. Your nurse will put a small, clip-like device called a pulse oximeter on your finger, toe, or ear. You may get this test during a doctor visit or hospital stay. You might need pulse oximetry if you have: ![]() Show if you need extra oxygen when you exercise.Test oxygen levels when you use supplemental oxygen. ![]()
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