Pulse ox reading chart1/5/2024 ![]() 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.Track your blood oxygen level during surgery.Diagnose symptoms like shortness of breath. ![]() Your doctor will use pulse oximetry whenever they think that your blood-oxygen levels could be too low. Your doctor can use this test to find out if you need to breathe in extra oxygen through a tube (your doctor may call it supplemental oxygen) or to be treated for a heart or lung problem. Your heart, brain, and other organs need oxygen to do their job. When it drops too low, your body doesn’t work as well as it should. But lung or heart disease can lower the amount of oxygen in these cells. Red blood cells carry oxygen from your lungs to your organs. It shows whether your heart and lungs supply enough oxygen to meet your body's needs. Pulse oximetry, or pulse ox, is a quick, inexpensive, and needle-free test that measures the amount of oxygen in your blood.
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