Pulse oximetry is a non-invasive method for monitoring a person's oxygen saturation (SpO2). A device placed on a finger, toe, or earlobe emits light and measures the amount that passes through, which is used to estimate the percentage of hemoglobin in the blood that is saturated with oxygen. It's commonly used in hospitals, clinics, and at home to monitor respiratory function and detect hypoxemia (low blood oxygen levels).
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