A pulse oximeter is a noninvasive device that estimates the oxygen saturation level in your blood. It works by emitting light through the skin and measuring how much of that light is absorbed by your blood. The measurement, typically displayed as SpO2, indicates the percentage of hemoglobin in your arteries that is saturated with oxygen. Pulse oximeters are commonly used in hospitals, clinics, and at home to monitor oxygen levels, especially for individuals with respiratory conditions like asthma, COPD, or pneumonia, or during or after surgical procedures. They are also used to assess the impact of physical activity on oxygen saturation.
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