Saturation of peripheral oxygen (SpO2)

Saturation of peripheral oxygen (SpO₂) measures how much oxygen your blood carries compared to its maximum capacity. It’s typically expressed as a percentage, with normal levels around 95-100%. When you breathe, oxygen enters your lungs and attaches to red blood cells, allowing your body to function properly. If SpO₂ drops below normal, it indicates your blood isn’t carrying enough oxygen, which can be caused by respiratory issues or other health problems. A simple device called a pulse oximeter quickly and non-invasively checks this level, helping monitor respiratory health and guide treatment decisions.